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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. :
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 . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

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

Matched PaIR EPAD MOSFET Array with a Single Supply -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Matched PaIR EPAD MOSFET with Dual Supplies -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Micropower High-Side MOSFET Drivers -  AN53 Linear Technology This App Note describes the operation of high-side Nchannel MOSFET switch drivers designed specifically for operation in battery-powered equipment, such as notebook and palmtop computers and portable medical instruments.  A selection__ Linear Technology/Analog Devices

Mini-box 2W Amplifier -  This amplifier was designed to be self-contained in a small loudspeaker box.  It can be feed by Walkman, Mini-Disc, iPod and CD players, computers and similar devices fitted with line or headphone output.  Of course, in most cases you will have to make two boxes to obtain stereo __ Contact: Flavio Dellepiane, fladello @ tin.it

Mini-MOSFET Audio Amplifier -  Including Preamp, Tone Controls and Regulated dc PS 18 Watt into 8 Ohm, 30W into 4 Ohm loads __ Contact: Flavio Dellepiane, fladello @ tin.it

MOSFET based H-Bridge controller for DC Motors -  To turn on any of the MOSFETs properly in your circuit, the gate voltage has to be significantly higher than the source voltage.  For the lower position devices Q2 and Q4, the sources are grounded to 0V therefore they can easily turn on into "saturation" by applying a gate voltage of a few volts above ground.

MOSFET Beats Murphy's Law -  12/22/94 EDN-Design Ideas - Consider it Murphy's Law: You buy two 15V supplies or one ±15V dual supply to power some op amps.  Then, when the last QA inspector or first customer flips the switch, the power supply hangs up.  This hang-up occurs because the positive supply yanks its output to positive.  The negative supply reads this output as a reverse polarity before it has a chance to start up.  So, the supply's negative regulator gives up.   __ Circuit Design by Phil Harvey, Technology Integration Inc, Bedford, MA

MOSFET Current Sensing -  Method of mirror current sensing a MOSFET __ Designed by Richard Torrens

MOSFET enhances low current measurements using Moving coil meter -  09/15/05 EDN-Design Ideas - Venerable mechanical meter can measure ultralow currents, with some help __ Circuit Design by Stefan Strózecki, Institute of Telecommunications ATR, Kaliskiego, Poland

MOSFET enhances Voltage Regulator's Overcurrent Protection -  3-Mar-05 EDN-Design Ideas - The classic LM317 adjustable-output linear voltage regulator offers a relatively high, if package-dependent, current-handling capability.  In addition, the LM317 features current limiting and thermal-overload protection.  With the addition of a few components, you can enhance an LM317-based voltage regulator by adding a high-speed short-circuit current limiter (Figure 1)  __ Circuit Design by Herb Hulseman, Eagle Test Systems, Mundelein, IL

MOSFET follower Power Amplifier -  Another contributed project that may be of great interest   __ Designed by Pavel Macura

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

MOSFET LDO Voltage Regulator -  This circuit has excellent voltage regulation, due to positive feedback through R2 however the circuit must be started up.  This is done by Q4 and Q5.  If the circuit does not need to be started under load, Q4, Q5, and R6 can be deleted.  You must then pl __ Designed by Andrew R. Morris

MOSFET PaIR makes Simple Circuit SPDT Switch -  12/09/99 EDN-Design Ideas - Ith an n-and p-channel MOSFET,  you can easily implement a single-pole double-throw (SPDT)  switch to isolate part of a circuit and power it from a secondary supplyPDF has several circuits, scroll for this one.    __ Circuit Design by Howard Chen, Vishay Siliconix, Santa Clara, CA

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

MOSFET Power Amp (project 101) -  200W MOSFET Hi-Fi Power amplifier   __ Designed by Rod Elliott  ESP

MOSFET prevents battery damage -  5-Feb-09 EDN-Design Ideas - A MOSFET protects reverse-connected batteries from excessive current __ Circuit Design by Santosh Bhandarkar, Wep Peripherals, Mysore, India

MOSFET provides high power at low loss -  EDN-Design Ideas - 05/12/2011    Use a MOSFET as a rectifier and reduce voltage drop and thus power consumption __ Circuit Design by Camilo Quintáns Graña and Jorge Marcos Acevedo, Vigo University, Vigo, Spain

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 Replaces Switch -  01/20/94 EDN-Design Ideas - By using a cheap, readily available MOSFET, you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power.  In Fig1, the switch simply controls the MOSFET gate, which swit __ Circuit Design by Malcolm Watts, Wellington Polytechnic, Wellington, New Zealand

MOSFET Replaces Switch -  02/03/94 EDN-Design Ideas - By using a cheap, readily available MOSFET, you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power.  In Fig 1, the switch simply controls the MOSFET gate, which switches on the negative supply.  Resistor R, which can be several __ Circuit Design by Malcolm Watts, Wellington Polytechnic, Wellington, New Zealand

MOSFET serves as Ultrafast Plate Driver -  10/03/02 EDN-Design Ideas - The circuit in Figure 1 provIdeas a 20-MHz square wave across a set of highly capacitive ion-deflection plates in an experimental instrument.  To get the required deflection, the plate voltage must be 20 to 30V, much higher voltage than conventional logic or driver families can provide __ Circuit Design by Clive Bolton, Bolton Engineering Inc, Melrose, MA

MOSFET shunt regulator substitutes for series regulator -  25-Nov-04 EDN-Design Ideas - You would normally use a series linear regulator or a DC/DC converter to obtain 3V dc from a higher supply.  However, when breadboarding a concept, you may be able to use a shunt regulator, especially if a series regulator of the correct voltage is unavailable.  The MOSFET in Figure 1 can replace a zener diode in a shunt regulator and provide lower output impedance than a zener diode __ Circuit Design by Stuart R Michaels, SRM Consulting

MOSFET switch provides efficient ac/DC conversion -  02/17/00 EDN-Design Ideas - Occasionally, you have access to a transformer for powering a dc circuit, but its output voltage is much higher than that required for the dc voltage.  The full-wave-rectified and filtered output of an ac input voltage V X , is V DC =1.414V X-2V F , where V F is the forward drop in the rectifier  (approximately 0.7V) .    __ Circuit Design by Spehro Pephany, Trexon Inc, Toronto, ON, Canada

MOSFET Tester -  This testing procedure is for use with a digital multimeter in the diode test-range with a minimum of 3.3  volt over d.  u.  t.   (Tony van Roon's diode-under-test) .  If your multi-meter is less than that it will not do the test.  Check your meter manual for the specs.   __ Designed by Tony van Roon  VA3AVR

MOSFET UPS Regulator's Output Current -  02/01/96 EDN-Design Ideas - Use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator.    __ Circuit Design by Robert Buono, Universal Sonics Mahwah, NJ

MOSFET, Inverter 12 volt unit -  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

MOSFET-based Joule Thief steps up voltage -  EDN-Design Ideas - 02/23/2015    This Design Idea illustrates a novel approach to the Joule Thief circuit __ Circuit Design by Sajjad Haidar

MOSFET-Based Preamplifier for FM Radio Dxing -  FM transmissions can be received within a range of 40 km.  If you are in fringe areas, you may get a very weak signal.  FM DXing refers to hearing distant stations...__ Electronics Projects for You

MOSFET-based, analog calculates square root -  19-Feb-09 EDN-Design Ideas - Square-root-calculating circuits find wide use in instrumentation and measurement systems for such tasks as calculating the rms (root-mean-square) value of an arbitrary waveform, for example.  Hence, designers need an effective analog square-root calculator.  Because manufacturers __ Circuit Design by Abhirup Lahiri, Netaji Subhas Institute of Technology, New Delhi, India;

MOSFETs Reduce Crosstalk Effects On Analog Switches -  02/17/97 EDN-Design Ideas - Some cost-effective analog multiplexer/demultiplexer ICs, such as the CD4053 and CD4066, find frequent use as signal distributors.  These digitally controlled analog switches have low on-resistance.  However, with all channels in the same package, crosstalk can be annoying and unavoidable.  Figure 1 provIdeas a cost-effective and viable method of solving this problem.  By simply adding some n-channel MOSFETs, such as the 2N7002 or 2N7000, the crosstalk effect becomes negligible.  When the Channel Select signal is high, the CD4053's input pins A, B, and C assume a level of nearly 0V.   __ Circuit Design by Stanley Chen, Global Mixed-Mode Technology, Taipei, Taiwan

P-channel power-MOSFET driver uses unity-gain op Amp -  21-Jan-10 EDN-Design Ideas - Drive a power MOSFET to 100V dc with this signal-conditioning circuit __ Circuit Design by Suded Emmanuel, Emmanuel's Controls, Auckland, NZ

Power MOSFET is Core of Regulated-DC Electronic LoA - D -  03/17/05 EDN-Design Ideas - Designers use electronic dc loads for testing power supplies and sources, such as solar arrays or batteries, but commercial ones are often expensive.  By using a power MOSFET in its linear region, you can build your own (Figure 1) .  It uses two simple feedback loops to allow the transistors to work as a current drain in current-regulation mode or as a voltage source in voltage-regu __ Circuit Design by Ausias Garrigós and José M Blanes, University Miguel Hernández, Electronic Technology Division, Elche, Spain

Power Resistor Varies In Value -  07/28/11  EDN-Design Ideas - Under controlled conditions, a MOSFET can function as a variable power resistor.  Testing power supplies or discharging batteries usually requires a constant-current load.  Sometimes, however, you must study the behavior when the load is a resistor.  Using a high-power potentiometer is an expensive approach that might not be worth the cost.  The circuit in Figure 1, which performs like a high-power resistor that connects between P1 and P2, provIdeas an alternative approach __ Circuit Design by Bogdan Raducanu, Bucharest, Romania

Produce Current from Positive or Negative High-Voltage Supplies -  05/26/11  EDN-Design Ideas - A simple modification lets you use an N-channel MOSFET in both applications.   __ Circuit Design by Kurt Nell, Sankt Pölten, Austria

Protect MOSFETs In Heavy-Duty Inductive Switched-Modes -  02/03/11  EDN-Design Ideas - Measure peak currents and use ac coupling to prevent FET burnout.  The MOSFET power switch is commonly the most vulnerable part of a new switched-mode high-power circuit.  One threat for this device is exceeding the value of the maximum allowed pulse current.  You cannot exceed this limit, even for pulse durations as short as 10 nsec.  You could still thermally damage the MOSFET with a high duty cycle even when the drain-to-source current has a value between the peak and the dc ratings. __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

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 . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

Push-Pull Complementary Power MOSFET Driver -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc


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

 


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