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

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Temperature Sensor MOSFET - Recently I was asked by a company to discover why one of their products failed to operate properly in cold temperatures.  Two n-channel MOSFETs and a few resistors are wired to form a flip/flop latch circuit.  Each time the pushbutton switch is pressed, the circuit changes state and remains in that state until another activation of the switch.. . . Circuit by David Johnson P.E.-December, 2010


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

Relay Toggle using a MOSFET  & Push Button -  This circuit is similar to the one above, but uses a N channel mosfet such as IRF530, 540, 640, etc.  in place of the NPN transistor.  Smaller mosfets could be used, but I don't know the part numbers.  I tested the circuit with a IRF640, IRFZ44, IRFZ34 and REP50N06.   The circuit has the same three advantages, it requires only a few parts, always comes up with the relay deactivated, and doesn't need any switch debouncing. __ Designed by Bill Bowden

Replace ORing Diodes with MOSFETs to Reduce Heat & Save Space -  DN363 Design Notes__ Linear Technology/Analog Devices

Reverse Polarity Protector -  A series diode is often used as a means of protecting equipment from accidental power supply reversal, particularly in battery-powered equipment.  Due to forward voltage losses, this is sometimes impractical.  One solution is to use an enhancement mode P-channel power Mosfet  (Q1) in series with the positive supply rail.  A device with low drain-source “on”

Select Vo by using EPAD Transistor & Resistor Ratios -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Series-connected MOSFETs increase voltage & power handling -  EDN-Design Ideas - 01/05/2015    A constant-current charger for a high-energy capacitor bank uses multiple MOSFETs to increase voltage and power-handling capabilities __ Circuit Design by Ilija Uzelac & Ron Reiserer

Simple 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

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

Simple 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

Simple Mosfet Switch -  Constructing a MOSFET switch is one of the basic level electronics projects and could be useful for beginners to get a hang of the various FET transistors.  The aim of this project is to make control a heavy duty DC load by constructing a simple switch.  MOSFET transistors are capable of handling a large voltage

Single-MOSFETs gate & Modulate -  EDN-Design Ideas - 07/27/2015    The humble discrete MOSFET shows its versatility in This design idea      __ Circuit Design by Umar Shami

Solid State Tesla Coil Chapter 7 -  In this chapter, we deal with the design of the Tesla coil driver.  We will discuss several components or subsystems, including the power supply, the controller, the gate driver and inverter, the fast fuse, and the current sense resistors __ Designed by Solid State Tesla Coil Dr. Gary L. Johnson

Temperature Sensor MOSFET -  Recently I was asked by a company to discover why one of their products failed to operate properly in cold temperatures.  Two n-channel MOSFETs and a few resistors are wired to form a flip/flop latch circuit.  Each time the pushbutton switch is pressed, the circuit changes state and remains in that state until another activation of the switch.. . . Circuit by David Johnson P.E.-December, 2010

Two Watt 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

Two 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

Ultra Low Voltage Crystal Oscillator using Active Loads -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Differential Amplifier -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Micropower Crystal Oscillator -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Nanopower Inverter  -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Nanopower LC Colpitts Oscillator -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Nanopower Two-Input NOR & NAND Gates -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage N-Channel Analog Switch Transmission Gate -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage RC Oscillator  -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Very Basic 12 volt 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

Voltage Controlled Resistor -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc


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

 


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