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Field-Effect Transistor Circuits
FET Circuits: 
#'s - C       D - L       M       N - S       T - Z

Last Updated on: Wednesday, October 18, 2017 05:04 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Circuits Designed by Dave Johnson, P.E. :

300v Peak to Peak Signal GeneratorThis circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times. . . Circuit by David Johnson P.E.-June, 2000

AC/DC relay from Charge Coupled MOSFETThis circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Astable Multivibrator with Very Low PowerThis classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Bi-Directional Charge Coupled Powers MOSFET RelayThe circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply.  Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

characteristics of CMOS Logic Inverter AmplifiersThis chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Charge Coupled Bi-Directional Power MOSFET RelayThe circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply.  Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line. . . Circuit by Dave Johnson P.E.-June, 2000

Charge Coupled MOSFET Relay #2This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current. . . Circuit by David Johnson P.E.-October, 2005

Charge Pump Efficiently Divides Supply Voltage This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by David Johnson P.E.-July, 2000

Circuit Protects from Battery Polarity ReversalThis simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was. . . Circuit by David Johnson P.E.-March, 2002

CMOS Logic Inverter Amplifier characteristicsThis chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers. . . Circuit by Dave Johnson P.E.-February, 2002

-/+-0.1V Differential Amplifier using Zero Threshold EPAD MOSFETs -  This circuit presents a differential amplifier using Zero Threshold EPAD MOSFETs that oooooperates on 1/- 0.1v supplies.    The schematic diagram is for a single amplifier stage__ Advanced Linear Devices, Inc

1 FET controls LED array -  04/12/01 EDN-Design Ideas White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL   (cold-cathode-fluorescent-lamp] and EL   (electroluminescent] technology.  As a result, white-LED backlights are increasingly common in PDAs   (personal digital assistants], cell phones, digital cameras, and other portable devices.  A design __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

 

12 volt Inverter-Very Basic type -  This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

2 Transistor Amplifier -  A 2 Watt audio amplifier made from discrete components.  This was one of the earliest circuits that I ever designed and built, in Spring 1982.  At that time I had only an analogue meter and a calculator to work with.  Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 3%,  __ Designed by Andy Collison

2m (144MHz) Dual Gate FET Low Noise Amplifier -  My good old FT-290 2m SSB and FM radio, had about 1uV sensitivity before installing this amp.  Now it is 150nV just like the best radios I have tested.  Stations I could hear with noise, are now loud and clear !! __ Designed by Thomas Scherrer OZ2CPU

2N2222 40 Meter CW/DSB Tranceiver -  In spring of 1998, NorCal sponsored a contest to design and build a project using no ICs and 22 or fewer 2N2222s as the active semiconductor devices.  I thought this was a really intriguing idea, so I set about to design my version __ Designed by Monty Northrup

2-Step Power Conversion: Portable Power for the Future -  Design Solutions 8 Design Notes__ Linear Technology/Analog Devices

300v Peak to Peak Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times. . . Circuit by David Johnson P.E.-June, 2000

40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier -  For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used.  This is a high gain    (Av=1001) example with excellent low offset voltage and drift with temperature __ Linear Technology/Analog Devices App Note, Mar 16th 2010

A 12 volt Inverter-Very Basic type -  This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

A better MOSFET H Bridge Schematic -  Schematic onlyno circuit desciption included __ Designed by Eugene Blanchard

A Simple Circuit Inverter -  This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

AC/DC relay from Charge Coupled MOSFET -  This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Active Mixer Design using the NE25139 Dual Gate MESFET 11/24/97  -  App Note  Doc #903__ California Eastern Laboratories

Advanced Polarity Protection with MOSFETs -  Advanced Power Switching and Polarity Protection for Effects __ Designed by © 1999 R.G. Keen

Ampli MOSFET -  DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms / __ Designed by Edwin Paij

Amplify & Shift EPAD MOSFET Output with an Operational Amplifier -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Application of Microwave GaAs FET's 9/16/82  -  App Note  Doc #910__ California Eastern Laboratories

Astable Multivibrator with Very Low Power -  This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Astable Multivibrators -  Multivibrators: an old, well known and boring subject.  Nonot at all: there are lots of different ways of looking a them and they are not at all what they may seem.   __ Designed by Richard Torrens

Basic EPAD MOSFET Connection with Current Source Drive -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Basic MOSFET/ EPAD MOSFET Inverter -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Basic MOSFET/EPAD MOSFET Diode-Connected  -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Better MOSFET H Bridge -  Schematic onlyno circuit desciption included __ Designed by Eugene Blanchard

Bi-Directional Charge Coupled Powers MOSFET Relay -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply.  Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Bit Reverser Scrambles Data for FFT -  03/02/95 EDN-Design Ideas The hardware bit-reverse and linear-address generator in Fig 1a scrambles a time-domain digital N-sample record.  The circuit is primarily meant to scramble data before taking a real-time butterfly FFT and can follow a formerly published EDN-Design Ideas     ("DAC and µP implement hardware window generator," March 31, 1994, pg 58) . __ Circuit Design by Alan Land, CRS Electronics, Pittsburgh, PA

Body diodes simplify UPS & energy recoverys -  EDN-Design Ideas 01/02/2017    This design idea illustrates a way to make use of MOSFETs’ parasitic body diodes in a power circuit that can be used in UPS and energy-recovery    (e.g., regenerative braking) designs.  When the Mode input  is high, the circuit acts as a bridge rectifier.  The bridge consists of diodes D1, D2, and the body diodes of MOSFETs Q1 & Q2.  In this mode, Q1 & Q2 are off and Q3 is on, enabling DC output U1. __ Circuit Design by Peter Demchenko

Build a 200W MOSFET Amplifier Module -  A compact audio powerhouse ideal for guitar or PA work or for use as a general-purpose subwoofer or hifi amplifier.__ SiliconChip

Cascode MOSFET increases boost regulator's input- & output-voltage ranges -  09/01/05 EDN-Design Ideas Simple enhancement extends range of both sIdeas of regulator __ Circuit Design by Scot Lester, Texas Instruments, Dallas, TX

characteristics of CMOS Logic Inverter Amplifiers -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Charge Coupled Bi-Directional Power MOSFET Relay -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply.  Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line. . . Circuit by Dave Johnson P.E.-June, 2000

Charge Coupled MOSFET Relay #2 -  This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to 10 amps of current.  The differential oscillator supplies voltage to the gates of the two FETs with good isolation will drawing only 1.5ma of current. . . Circuit by David Johnson P.E.-October, 2005

Charge Pump Efficiently Divides Supply Voltage  -  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by David Johnson P.E.-July, 2000

Circuit Detects Current Pulse -  01/06/94 EDN-Design Ideas The pulse detector provIdeas a visible indication of positive and negative current pulses.  The pulses amplitudes can vary from20 to150 mA.  The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute __ Circuit Design by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada

Circuit improves on bias for GaAs FETs -  12/06/01 EDN-Design Ideas It's important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC (monolithic-microwave-IC] amplifier.  These devices are extremely sensitive to drain and gate voltage levels as well as to the order in which these biases turn on and off.  A GaAs-FET amplifier that uses two bias voltages-a negative supply, VGG, on its gate and a positive supply, VDD, on its dra __ Circuit Design by Tom Roberts, Anritsu Co, Morgan Hill, CA

Circuit Lets You Characterize JFETs -  04/06/12  EDN-Design Ideas Measure the pinch-off voltage VP and zero-bias drain current IDSS to select matched pairs of JFETs.   __ Circuit Design by John Fattaruso, Dallas, TX

Circuit Protects from Battery Polarity Reversal -  This simple circuit can protect a sensitive electronic circuit from an accidental connection of a battery with a reversed polarity.  The N-channel FET connects the electronic device to the battery only when the polarity is correct.  The circuit shown was. . . Circuit by David Johnson P.E.-March, 2002

Circuit reduces negative-voltage stresses on control IC -  04/18/02 EDN-Design Ideas In a synchronous, buck switching power supply, the two FETS and the output inductor meet at the phase node (Figure 1) .  The phase node often connects directly to the control IC.  The voltage on this node swings from the input voltage to some voltage lower than ground.  If the voltage goes too far below ground, the ESD structures or other circuitry within the control IC can become forward-bia __ Circuit Design by Michael Day, Texas Instruments Inc, Dallas, TX

CMOS Latches Relays -  11/18/10 EDN-Design Ideas A driver circuit take pulses and sets relays.  [Design Ideasby JC Maillet, Gabriola Island, BC Canada __ Circuit Design by JC Maillet, Gabriola Island, BC Canada

CMOS Logic Inverter Amplifier characteristics -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers. . . Circuit by Dave Johnson P.E.-February, 2002

Converting GaAs FET Models for Diffrent Nonlinear Simulators 10/26/97  -  App Note  Doc #905__ California Eastern Laboratories


Field-Effect Transistor Circuits
FET Circuits: 
#'s - C       D - L       M       N - S       T - Z

 


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