Looking For Great Deals On Bias Probe? From Everything To The Very Thing. All On eBay. Get Bias Probe With Fast And Free Shipping For Many Items On eBay Total tone control - customize & tweak preamps, tubes, cab IRs, dual mics, EQ & more. Accurate, thorough and versatile guitar amp modeler & designer. Available now By owning a bias probe you're not at the mercy of a tech anymore and you are now in control of your tone. There are two different kinds of bias probes, one type that uses a resister in the circuit and measures in millivolts and the second type that does not use a resister and measures directly in milliamps. Ohm's law states that one volt. The cheapest solution. Since 2006 we have offered a single octal bias probe for use with a Multimeter. We will continue to offer these because in conjunction with a Multimeter this is the most cost effective tool for measuring true plate current allowing you to accurately bias your amp. These probes are $25.00 and available in our online store and can be used with 6V6 - EL34 - EL34II - E34L. A circuit which can match JFETs for Vgs at a typical current, which produces good results for JFET-type phasers like the Phase 90. Pedalboard PS . PS Schematic: Pedalboard Power Supply with adjustable Old Battery settings: DIY Bias Probe: DIY Bias Probe: Transformer Short Tester: Transformer Short Tester: Stomp Switch wiring: Stomp Switch.
The bias supply can be sending different negative voltage levels to each tube. If you do not have a bias pot, you will have to figure out where the fixed resistor is in the bias circuit that controls the negative bias voltage. It is a resistor that will be able to read the negative bias voltage on one end and is connected to ground on the other. This will show you the tube's idle current (bias) in milliamps (mA). Step Four. Using the bias adjustment trim pot in your amp, usually located inside the chassis or underneath it, adjust the tubes' bias current to the desired level. Switching between the sockets will show each tube's current on the meter. Measuring Plate Voltag
3.1) No, the working point gets applied via R_bias, the second gate is merely short-circuited for gain stabilisation. The 9V at the drain is the supply, not the bias. I changed the setup-schematic to reflect that (ext. DC referred to the thesis' experimental bias, oops.. Measure the Bias by Cathode Resistor Voltage Drop. If your amp is cathode biased or has 1 ohm bias setting cathode resistors then you can calculate bias current by measuring voltage drop across the cathode resistor.To do this set your multimeter for DC Volt measurement, clip the black probe to a chassis ground (so you can use just one hand to do the measurement) and put the red probe on the. In this vid, I'll show you how to make your own cheap, DIY tube or valve guitar amplifier biasing probes for measuring plate current and plate voltage. Simil.. The average bias job costs $40 - $60. Build your own bias adapter with our TubeDepot Bias Scout kit and you'll save money every time you set the bias on your amp. This kit includes all the parts to build a single octal socket TubeDepot Bias Scout
A bias meter is a device that can measure current in a tube amplifier. It uses a set of probes that are plugged into the tube sockets and the tubes are then plugged into the probes. This allows the meter to jump into the circuitry of the power amp without the need to disconnect any wires or components. The bias of the tube amp is measured in. The meter I use is based on the Mark Weiss modulation meter. RSSI Based Signal Meter Schematic; Simple Analog Field Strength Meter. This is a simple field strength meter that can be used to verify that you antenna is in fact radiating energy Revisit™ Bias Checker Kit by Hoffman Amps The Revisit Bias Checker Kit by Hoffman Amps is the best of both worlds when it comes to ease of assembly and cost effectiveness. This kit is easy to build, and comes with assembly instructions in the link below. Kit builds one bias probe to be used with a multimeter. Download assembly manual here Overview. In electronics, bias usually refers to a fixed DC voltage or current applied to a terminal of an electronic component such as a diode, transistor or vacuum tube in a circuit in which AC signals are also present, in order to establish proper operating conditions for the component. For example, a bias voltage is applied to a transistor in an electronic amplifier to allow the transistor. Bias Probe - Buy or DIY Discussion in 'Amp Tech Center' started by jonrpick, Apr 11, 2015. Apr 11, 2015 #1. jonrpick Friend of Leo's. Posts: 2,280. Joined: Mar 17, 2014 Location: Marietta, GA. I've been thinking about getting something to simplify bias readings. From what I've read, it appears that some of the commercially-available bias meters.
Any other bias meter superior to this Brand which can measure the bias more precisely. This device doesnt even show the negative sign on the voltage reading! jalexquijano, Jul 29, 2016 #1. ampmadscientist Well-Known Member. Joined: Jun 26, 2014 Messages: 17,860 Likes Received: 12,07 Note: This will invoke the PSpice A/D Window. A bias point simulation will not show anything in this window. Back in the schematic, use the Enable Bias Display buttons on the toolbar or select PSpice > Bias Points to view the values for Voltage, Current, and Power. Select PSpice > New Simulation Profile from the menu The Bias supply is negative configured off a winding of the power supply. It supplies somewhere north of - 100 dc to the grids through the 1.5 ohm shunt and the other resisters in the network. This keeps the tubes Cut off until the keying circuit is grounded. The keying relay is part of the Bias circuit. Take a look at the schematic and see this Schematic diagrams for both the 539B and 539C are readily available for free on the internet. These all seem to be reprints of the official Hickok documentation. It has been noted that the 539B schematic contains errors in the bias meter circuitry. This was corrected (but only partly) in the 539C schematic Construction & Use of bias meter The meter can be built into the amplifier, or you can use the same principle by bringing points A, B, and the ground to a connector and building the circuit externally. I built a stereo version of the meter shown in Figure 5 on a 2 × 2.5 perfboard with wirewrap construction
Any other method requires you to probe, set the bias, disconnect probes, play, probe, set bias again, play, etc. until you are happy with the results. Several ways to reach the same destination, but I like the safety and convenience of the Eurotube Pro meters Where a probe comes in handy is when you have an external bias control, or have PCB mounted tube sockets. Other than that, there's ways to bias with just a meter and a little bit of care. With that in mind, you must also consider that pin 3 and pin 4 carry anywhere between 400v-500v, so bias at your own risk Most bias probes go between the valve and the socket like a spacer but fabricating that is a pita. There is an easier way. (You can also place the resistor in the anode circuit (pin 3),.
Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) 4.2 out of 5 stars 57 $16.99 $ 16 . 9 Now that the circuit bias has been established, and AC Sweep can be run to determine the small signal frequency response, since the application is intended to be audio, the sweep will be set for 10Hz to 100kHz. The Probe in the schematic will change to reflect the trace colour. Transient Simulation The 4CX250B linear. Operation is very simple, The only controls are tune, load, bandswitch, meter and bias set. Bias should be set for about 100 to 150 ma resting current with 2000 volts on the plates, Once set, this current does not need adjustment
Setting the bias correctly is essential for achieving optimal tone and performance, and keeping your amp running safely. Swap power tubes without fear VHT sells this as a tube tester; we find its best used as a tool to find and set your amp's bias. The bias is the current flowing through the amp when idle ×6 multiplier schematic are shown in Figure 7. The VXO circuit is the original circuitry in the MicroT2 circuit. The only change from the values in the original 40 meter VXO described in QST is the value of the low pass output transformer. This was Figure 4 — 7.165 MHz LSB single-tone output spectrum at 1 W (black) and 3 W (red) output Get Bias Probe With Fast And Free Shipping For Many Items On eBay. Looking For Great Deals On Bias Probe? From Everything To The Very Thing. All On eBay Pin 1 and pin 8 are keyed with either a flat line or a knotch. To measure the bias, place the probe on the resistor lead connecting to the tube. To locate the bias adjustment point on the PC board, locate the trim pot with the blue casing. Refer to the circuit diagram also for the bias adjustment points. Warning Tip: If the selector switch is working, put the positive voltmeter probe on the bias meter + terminal (usually this is a red wire) and the other probe to ground to measure the voltages mentioned above. Just rotate the selector switch and you can read each tube much more easily than trying to get a probe down near the tube sockets
My bias circuit uses a 10 watt Zener diode having a value of 4.7 VDC and a 50 Kohm 10 watt resistor for biasing the four tubes. This circuit is located in fig. 3. The voltage drop across the Zener plus the drop across the 50K ohm resistor provides cutoff bias, frequently called standby bias. This level is reduced to operating Zener bias only whe The bias probe as shown is shown as fully cased in plastic and not ground referenced at all, just for those safety reasons. Amazing!! Who would ever have guessed that someone who villified the evil rich people would begin happily accepting their millions in speaking fees
These bias probes are generally used with fixed biased amps where the cathode is grounded. In your 5e3, the bias is set with a large value resistor in the cathode circuit. I have never tried using one in a cathode biased circuit like the 5e3 You will need a multimeter (also called a VOM [Volt-Ohm Meter] or DMM [Digital Multi-Meter]) that reads DC voltage. You do NOT need a Weber Bias Rite, or a Bias King if you have a multimeter and matched power tubes from a reliable source—Groove Tubes isn't one of them. So save your money! You can find multimeters at your loca The Bias King is a simple, effective, and accurate diagnostic tool designed to read the current flowing through the tube of an amplifier (bias). The bias on an amplifier can be adjusted by a technician to allow more or less current to flow. The more current there is flowing, the higher the numbers will be on the Bias King and the hotter the. $ new matched JJ 6l6gc are getting 330 vdc plate to cathode and my bias probe says 50ma, according to the RobRobinette bias calculator I should be around 84ma. The 1474 has a 39 ohm and 220 ohm 5 watt bias resisterst hat power a couple 12ax7 heaters. My question is if I change the 220 ohm resister to 160 will the heaters be ok. Thanks in. D) Adjust the bias to obtain the best tone, while keeping the tubes within specifications. For this particular reading, you'll need to change your test leads to the CURRENT input jacks, and select the 200 mA DC range. The two probes are applied to the center tap and either of the ends of the output transformer's primary
.. If the diode is in the circuit then make sure that the power supply is OFF and the capacitors are discharged. With the above method, check for the anode and the cathode terminals. Place the probes of multimeter in a way that makes the diode in the forward bias (red probe to the anode and the black one to cathode) Bias-Metering Circuit This bias-metering circuit is not new by any means, but it enables quick, simple, and reasonably accurate bias setting without a meter. It is a simple, discrete transistor differential amplifier driving a pair of LEDs. When the two reasonably matched transistors' bases have the same voltage, the LEDs illuminate equally Turn on the bias displays for voltage and current. This will show the bias values annotated within the schematic itself once the simulation is done,. Click the Run icon to perform the simulation. Here, you'll see an empty window without any waveforms, because PSpice does not generate probe data for bias analysis
if your amp has an external bias adjustment, then go ahead and buy/make a bias probe. however, if you need to remove the amp chassis to set the bias internally, then I really don't see the point in a bias probe as you can measure the voltage straight from the pins on the valves bases Circuit 1# Simple Logic Probe using IC-4050. If you want a logic probe circuit that easy and save money. This circuit may be best choice. I interested circuit. It is cheap Logic probe using 4050. It name is CMOS 4050 or CD4050 or LM4050. Which is the integrated circuit of not gate buffer logic. I use just one part or 1/6 only This site shows how to build a probe that puts a multimeter in the pin 8 circuit. In their instructions on using the probe, they do not mention measuring the plate voltage reading on pin 3. As I understand it, the plate voltage is needed to properly calculate the proper bias value . In most of the MOSFETs, the forward drop across the diode is from 0.4 V to 0.9 V. In reverse bias, this diode acts like an open circuit or high resistance path. So, the MOSFET can be checked by examining the conductivity across this source-drain body diode In Experiment 3, we investigated whether a bias towards happy faces is contingent on a social-processing mode. Participants performed a dot-probe task with socially meaningful (schematic faces) or socially meaningless (scrambled schematic faces) targets. Again, a bias towards happy faces, which was not moderated by target type, occurred
Meter Circuit: Metering the plate, screen, and grid currents of an RF amplifier is an important method of monitoring amplifier operation. The best way, if space and money permit, is to use a separate meter for each element, as was done in the Wingfoot 813 Amplifier The bias point simulation calculates the DC bias point based on DC source values and any initial conditions set on the circuit. If there are transient sources present in the circuit the bias point calculation will use their value as defined at time=0 TM 11-2200 Bias meter I-97-A, 1943-08-14 TABLE OF CONTENTS SECTION I Description Paragraph General 1 Components 2 Size and Weight 3 SECTION II Installation and Operation Installation 4 Power Supply 5 Preparation for Use 6 Operating Adjustments 7 SECTION III Functioning of Parts General Circuit 8 Normal Operation 9 Bias Indication 10 Bias Measuring Circuit 11 Use of Jack 12 SECTION IV.
4. Insert the pins from your bias probe to your multi-meter, attach the tube to the bias probe, attach probe to the socket you removed to tube from. 5. The probe measures in DC Milliamps, set your meter to the DCA mode, select the 200mA setting. 6. The amplifier needs a speaker load, plug the speaker out cable to the speaker cabinet Full-scale meter voltage sensitivity, important in any current meter used with an external shunt, is meter current times meter resistance. If the meter is 1 mA and has 50 ohms resistance, full-scale sensitivity is .001 amperes*50 ohms = .050 volts, or 50 millivolts FS. 50 millivolts is a very common meter movement value If you have a multimeter, set it to the DC volts setting, attach the negative probe to a spot on the enclosure (screw hole works well) or ground point on the PCB (if you are savvy), and touch the positive probe to the point on the circuit board labeled Bias. Adjust the little trimmer on the circuit board until your meter reads 4.5 volts
connect the 50vdc supply with an amp meter in the circuit. set the bias pots for 40 ohms. turn on the 50vdc supply. turn on the bias and adjust the pots for about 1.930vdc or 4 amps of current on the amp meter in the 50vdc supply. the bias should be the same on both devices. always use thermistors in the bias circuit The LTC6268-10/LTC6269-10 is a single/dual 4GHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It is a decompensated op amp t The best way to check bias is across the output transformer-but it is not for the casual user, pro only. Does the instructions say anything about testing 1 of 4 tubes in a push/pull circuit like a twin? How is the bias pot put in? Schematic of the mod? What kind of bias probe? Ja Now SLOWLY turn the bias adjustment screw clockwise while you watch the meter for the correct mA reading. Now unplug the bias meter plug from the bias jack and move the meter's plug to the other channels bias jack if this is a stereo amplifier. You will need to move the meter back and forth adjusting the bias a little at a time until set. The DC bias voltage application function built into Hioki LCR meters is designed for use in measuring capacitors, and it cannot be used to apply a DC current. To superpose a DC signal, either use the DC Bias Current Unit 9269 (or 9269-10) and an external power supply, or create your own circuit for the purpose
Remove the power tubes and Insert the power output tubes into the bias probe sockets. Then Insert bias meter probes into the tube sockets of the amplifier. Turn on your power amp and let the tubes get warm about 5 minutes.Read the bias measurement. Current meter A is reading A input, and the Current meter B is reading for B input When the scope probe ground clip is connected to the outer foil lead the waveform size will be smallest. The smaller waveform represents less RFI noise getting into the cap--and this is a good thing. Mark the ground probe end of the cap and connect it to the lowest impedance in the amp circuit R3 provides bias for the JFET and, together with an RC network, provides the necessary quenching oscillations. The time constant set by C8A, C8B, R7 and bias resistor R3 is deliberately made long enough so that the dc-bias level across R3 increases until it inhibits the oscillating detector PSpice is a general-purpose circuit simulator capable of performing four main types of analysis: Bias Point, DC Sweep, AC Sweep/Noise, and Time Domain (transient). Bias Point The Bias Point analysis is the starting point for all analysis. In this mode, the simulator calculates the DC operating point of the circuit The bias winding of the transformer, T203, is connected to CR207 and CR208 in a full-wave rectifier circuit. This circuit provides grid bias voltage for the power amplifier. The heater of the 3-minute time-delay relay is supplied power from the 115-volt a-c connections which also furnish power to the high-voltage rectifier filament transformer.
. In his article, Andrew describes his design of a high-voltage differential probe with features similar to commercial devices, but at a considerably lower cost Wide-band bias tees must use circuit topologies that avoid the shunt direction in order to be functional. Instead of a single inductor, a set of inductors will be used. To avoid resonances, there will be additional resistors and capacitors. 1st A Picosecond Pulse Labs model 5580 bias tee, for example, works from 10 kHz to 15 GHz We measured reaction time, gaze direction and gaze duration to assess attentional bias toward food images in pairs of food and non-food images that were presented in a visual probe task (Experiment 1, n = 21) and/or eye-tracking task (Experiment 2, n = 20). We also measured appetite ratings using visual analog scale These 11 meter amps dont have this. What > > I'm making is a good RF keyer, and the bias circuit to set the > > transistors to class AB, or AB1. The keying circuit they've been > > using on a bunch of different models just tie the parts together > > in mid air, and look like a rats ne > > st. Terrible construction, but the rest of the amp is.
StewMac® Tools + Ideas for Guitarmaking. 100% Guaranteed Since 196 With fixed bias amps, this resistor can be added as a permanent modification to all the cathodes, or can be part of a bias probe. ( Plans for a bias probe are available on R.G. Keen's Web site, or bias probes can be purchased). 1 ohm and 10 ohm resistors are nice because you don't have to do any arithmetic, but any low value could be used This probe system is designed to do the same role as the substrate connected to the r.f. bias power supply. The probe, the capacitor, and the ac power supply are corresponding to the wafer, the back capacitor, and the r.f. power supply, respectively. Download : Download full-size image; Fig. 1. Schematic diagram of a pulsed helicon wave plasma. In Experiment 3, we investigated whether a bias towards happy faces is contingent on a social-processing mode. Participants performed a dot-probe task with socially meaningful (schematic faces) or socially meaningless (scrambled schematic faces) targets. Again, a bias towards happy faces, which was not moderated by target type, occurred Active probes use the high input impedance of a field effect transistor amplifier to buffer the probe tip from the oscilloscope input. A typical active probe provides 1:1 voltage gain with an input resistance of 1 MW, input capacitance of 2.2 pF, and a bandwidth of 1 GHz. A simplified schematic of an active probe is shown in figure 14
The thermally stabilized bias circuit could be substituted with a resistor because the temperature characteristics of power MOSFETs incorporates an in-built thermal control of the bias current at around 100 milliamps (which is approximately is the the best suited bias current). In case you find the meter reading substantially dissimilar to. Recently I have been overhauling an Ampeg V4B bass amp, and after all the necessary repairs had been made, the matter of checking the bias current raised itself. The bias probes I put together from Bruce Hoffman's parts do not, unfortunately, work very well with the owner's chosen 7027A power tubes
Output errors (due to the op amp input bias current and input offset voltage, routing of the circuit wiring, circuit board sur-face leak current, etc.) should be reduced, next. A FET input op amp with input bias currents below a few hundred fA or CMOS input op amp with low 1/f noise are selected. Using a You can have LTSpice show DC voltages directly on schematic nodes. Close the plot window that automatically opens when the simulation is run. Now just left click the nodes to place the voltage markers. If the plot window is open, then you have only the probe tool for displaying plots of nodes, that's why you need to close the plot window first This paper presents a low power two-stage single-end (SE) 28 GHz low-noise amplifier (LNA) in 90 nm silicon-on-insulator (SOI) CMOS technology for 5G applications. In this design, the influence of bias circuit is discussed. The 1200 Ω resistor which was adopted in bias circuit can feed DC voltage as well as keep whole circuit unconditionally stable
If your multi meter displays 0.548 Volts then you have a circuit with Forward Bias Diodes. If your multi meter displays OL then your circuits has Reverse Bias Diodes. Here is the key to the puzzle. If you test the wire in your circuit and your meter displays a dead short (0.000 and typically sounds a steady beep) then your circuit has one or. Circuit Description Although simple, every effort was made to coax as much performance as was possible given the limitations of keeping the circuit simple and affordable. The Receiver The RF front-end uses a high performance 3 section band-pass filter for strong image and IF rejection. The three poles of filtering provide for a no-tune bandpass. The Voltech DC1000 DC Bias Supply has a unique constant current output stage configuration which electronically (as opposed to passively) isolates the bias supply from the DUT, enabling the DUT to be tested under realistic circuit conditions with high and variable DC current The C1 in this circuit is the same capacitor C described in the electret-microphone circuit above and its role is to cut off the DC offset of the input signal such that we work out only the AC component of the input signal. Finally, we need one more component, a bypass capacitor between the Emitter terminal and the ground, thus C E
Figure 2 illustrates the basic construction and operating principles of a simple n-channel JFET. It consists of a bar of n-type semiconductor material with a drain terminal at one end and a source terminal at the other. A p-type control electrode or gate surrounds (and is joined to the surface of) the middle section of the n-type bar, thus forming a p-n junction The large meters indicate the bias current for each channel and the small meter indicates the B+ supply voltage. It is always a good idea to have a meter on the B+ supply when powering up a new circuit. It gives a quick indication of circuit health, and an indication of how much stored charge is left after the amp is turned off
The previous schematic was of the Heathkit #309-B RF probe. The schematic above of the T-3 probe is now correct. The photo above showing a pill-botle and replacement parts for the T-3 probe is correct except for substituting a 0.01 capacitor in place of the 0.02 cap shown in the Heath probe schematic . Thanks Karl. 2 Demodulator probe: schematic-PD: Direct probe: for low frequency or low impedance circuits - schematic--PLC: Low capacity probe: Ocilloscope - high impedance - schematic-PTP-11: Peak-to-peak VTVM probe: Use with 11 Mohm VTVM - schematic--PTP-25: Peak-to-peak VTVM probe: Use with 25 Mohm VTVM - schematic--PRF-11: RF VTVM probe: Use with 11 Mohm.
For a pnp transistor, the polarity of the meter leads are reversed for each test. When the Transistor Is Defective . When a transistor has failed with an open junction or internal connection, you get an open circuit voltage reading (OL) for both the forward-bias and the reverse-bias conditions for that junction, as illustrated in Figure (a) 2. Using a volt meter, measure the voltage from cathode (pin 8) to ground on the output tubes. Across the 10 OHM cathode resistor is a convenient measuring point. 3. Adjust the bias trimpot located farthest to the right (looking from the front) on the GB-1 and BB-1 circuit boards until you read .5 volts DC across the 10 OHM cathode resistor This is a simple, but incredibly useful sweep. It will not launch Probe and so give you nothing to plot. But by clicking on enable bias current display or enable bias voltage display, this will indicate the voltage and current at certain points within the circuit. D. Parametri A note on bias point calculation: Normally there is a DC bias calculation performed separately from any other simulation.This is the .OP command. Another bias calculation is performed at the beginning of the transient analysis. The difference between the two is that the transient bias uses the TIME = 0 value for the source rather than the DC value (a single source can have an AC, DC, and a. The Jfet input is via a co-ax probe or short croc clip leads through a small grommet hole in one of the box short sides. By requirement, the whole circuit can be made straightforwardly as shown. Alternatively an extra break/link facility could be created, by an RF co-ax link through a small grommet hole from the Jfet output to an external free.
This means that the circuit must be broken and the meter inserted in SERIES with the circuit. Some amplifiers have bias monitor jacks for this purpose. There are bias buddy type devices that plug in to the tube socket, and the tube plugs into it, also for this purpose If the readings are not correct for any of the P1, P2 or P3 tests check resistors R9 / 12 ohms, R2 / 1.2K, R1 / 1.8K, R16 / 200 ohms. The sensitivity of the meter and the accuracy of the ENGLISH control also affect this test. GAS TEST: 16. The gas testing circuits depend on the meter bridge, ENGLISH and BIAS controls. If the mutual conductance.
Bias Voltage and Current Sense Circuits for Avalanche Photodiodes Feeding and Reading the APD. Harry Ramza. Related Papers. DESIGN FEATURES Synchronous Switching Regulator Controller Allows Inputs up to 100V. By Juler Hunter. CA3130, CA3130A 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output Circuits divided on whether Title IX bars job-based sex bias Professor says probe tainted, female student harassed him The college argued that Peyman Farzinpour's employment discrimination allegations under Title IX of the 1972 Educational Amendments Act were preempted by Title VII of the 1964 Civil Rights Act Plate circuit Cathode circuit . TEST RESULTS AND OBSERVATIONS: 1. The amplifier came online with no problems. It puts out 1/2 the power of the two holer. 2. The cooling blower is much quieter than the original. 3. The additional turns on the pi-net inductor worked fine. 4. I'm able to install the RF deck without the need of a helper 14. The saturation current of a transistor used in a fixed-bias circuit is _____ its value used in an emitter-stabilized or voltage-divider bias circuit for the same values of RC' A) more than . B) the same as . C) less than . D) None of the abov Professor Can Pursue Bias Claim Over Student-Harassment Probe. The Third Circuit, Seventh, and Ninth Circuit in those decisions, and other courts elsewhere, have also found that colleges' reaction to the federal guidance from the Obama administration was relevant to allegations of anti-male bias