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MOSFET Circuits
MOSFET's:   #'s - L      M - Q      R - Z
 
 

Last Updated: October 18, 2017 05:04 AM

Circuits Designed by Dave Johnson, P.E. :

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

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

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

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


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

-/+-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

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

2 Watt Amplifier -  An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load.  Carlos has used this amplifier on his AM radio for many years.   __ Designed by Carlos Feldman

25 Watt MOSFET Audio Amplifier -  High Quality simple unit.  No need for a Preamplifier __ Contact: Flavio Dellepiane, fladello @ tin.it

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

A better MOSFET H Bridge Schematic -  Schematic only - no circuit desciption included __ Designed by Eugene Blanchard

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

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

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 only - no 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

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

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

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 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

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

Differential EPAD MOSFET Matched-PaIR with Buffered & Summed Outputs -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Differential EPAD MOSFET Matched-PaIR with Summing Output -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Diode-Connected EPAD MOSFET with Buffer Amplifier Output -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

H-BRIDGE Theory & Practice -  A number of web sites talk about H-bridges, they are a topic of great discussion in robotics clubs and they are the bane of many robotics hobbyists.  I periodically chime in on discussions about them, and while not an expert by a long shot I've built a few over the years.  Further, they were one of my personal stumbling blocks when I was first getting into robotics[Chuck McManis] __ Designed by Chuck McManis

High Current MOSFET  Flip Flop with Debounced Pushbutton -  This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren.  It is useful where the load needs to be switched on from one location and switched off from another.  Any number of momentary  (N/O) switches or push buttons can be connected in parallel.  The combination  (10K, 10uF and diode) on the left side of the schematic insures the circuit powers up with the load turned off and the NPN transistor conducting.  These components can be omitted if the initial power-on condition is not an issue. __ Designed by Bill Bowden

High-Impedance FET probe extends RF-spectrum analyzer's usable range -  21-Jul-05 EDN-Design Ideas - Op amp and careful design/construction build high-impedance RF probe __ Circuit Design by Steve Hageman, Windsor, CA

High-side driver feeds IGBTs & MOSFETs -  11/23/00 EDN-Design Ideas - The low- to moderate-power system in Figure 1 provIdeas the interface between a pulse-width modulator and a high-side IGBT (insulated-gatebipolar-transistor) or MOSFET switch.  You can use it to interface TTL or CMOS circuitry to an H-bridge __ Circuit Design by Carlisle Dolland, Honeywell Engines and Systems, Torrance, CA

Inrush limiter also provides short-circuit protection -  06/09/05  EDN-Design Ideas - MOSFET keeps inrush currents due to capacitive loads under control __ Circuit Design by Ryan Brownlee, Process Automation Division, Pepperl & Fuchs Inc, Twinsburg, OH

Inverter 12 volt unit Mos-Fet Design -  A Very Reliable, Efficient and Practical Design.  Do Not ask how to Build this for Power ratings over 1000 watts, That is NOT Practical.   __ Designed by G.L. Chemelec

Isolated MOSFET driver has wide duty-cycle range -  29-Apr-04 EDN-Design Ideas - The main application for the circuit in Figure 1 is for driving power MOSFETs with signals ranging in frequency from 1 Hz to 300 kHz and with duty cycles from 0 to 100%.  You achieve this goal by using a coreless pc-board transformer.  The switching frequency in most power-electronics circuits ranges from a few hertz to a few hundred kilohertz __ Circuit Design by Jesus Doval-Gandoy and Moises Pereira Martinez, ETSI Industriales, Vigo, Spain

Low-Cost MOSFET Quashes Power Resistor -  06/09/94 EDN-Design Ideas - At power-on, off-line power supplies use a resistor to provide start-up current for the PWM IC, current that is necessary to start driving the power switch.  After a few periods, an auxiliary winding delivers a sufficient voltage to power the IC.  Unfortunately, the start-up resistor dissipates heat and __ Circuit Design by Christophe Basso , European Synchrotron Radiation Facility, Grenoble, France


MOSFET's:   #'s - L      M - Q      R - Z

 


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