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Last Updated on:
Wednesday, June 02, 2021 01:44 PM

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 Dave Johnson P.E.-June, 2000

40Khz Ultrasound Transducer Driver uses Medium PowerThis crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . Hobby Circuit designed by Dave Johnson P.E.-January, 2006

50ua Current Drives Solid State Relay Requires OnlyMost solid state relays require at least 5ma and often more input control current, to fully turn on the device.  But such current levels often force battery powered circuits to use excessively large batteries.  The relay hobby circuit shown below demands only 50uA of input current . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

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

A DC to 20 MHz Coax Driver using Discreet Transistors -  This is what we used to call "wide band" in the old days.  It works very well as the output amplifier for a 20 MHz function/sweep generator on my workbench. 
 __ Designed by Dick Cappels

A Fourth Generation of LCD Backlight Technology -  Linear Technology AN65 __ Designed by Jim WilliamsNov 1st, 1995

A Logic-Level actuated, adjustable glow-plug driver -  All of my turbine starts before the research on the ECU involved a very successful spark ignition.  I thought    (only briefly) of trying to add spark ignition to the ECU, but the mixture of delicate logic circuitry and perhaps 30, 000V simply don't mix.  My past experience with the hall sensor ignition for the radial engine bears this out in painful detail.  So I decided to go with a glow-plug driver.  

A New Low Power High Output Current Dual CFA Makes xDSL Line Driving Clean & Easy -  DN187 Design Notes__ Linear Technology/Analog Devices

A One Watt White LED Power Supply Light for Battery Powered Operation -  This is a current fed buck converter that is made with PNP bipolar transistors and a N-channel MOSFET, and operates from four AA cells    (6 volts) to drive and LED efficiently at a nearly constant power level.   __ Designed by Dick Cappels

A Precision Wideband Current Probe for LCD Backlight Measurement -  DN101 Design Notes__ Linear Technology/Analog Devices

Actively Driven Ferrite Core Inductively Cancels Common-Mode Voltage -  14-Dec-07 EDN-Design Ideas Active inductive noise cancellation cancels common-mode-voltage error components in both inut and output signals   (EDN-Design Ideas ] Design by W Stephen Woodward, Chapel Hill, NC

Active-Matrix LCD Bias Supply Operates from Battery Input -  02/03/00 EDN-Design Ideas Many active-matrix-LCD applications need multiple voltages for thin-film-transistor    (TFT]bias.  Typically, three voltages are necessary5V forcolumn driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for  Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA

Adapt Differential Input to Drive Coax -  05/08/97 EDN-Design Ideas Uses an HFA1100 or HFA1105 to convert a balanced input signal to a single-ended output signal, uses positive feedback to characteristic-impedance matching while increasing the available output swing, as compared with using a simp Design by Donald Whitney Jr, Harris Semiconductor, Melbourne, FL

ADC Input Driver DIFFERENTIAL to DIFFERENTIAL -  The last of our basic ADC input drivers is the differential input to differential output driver.  Suppose another part of your circuit already converted a singled-ended sensor signal to 2Vdifferential.  However, this differential signal sakes its way past noisy AC sources and switching power supplies.  

ADC Input Driver DIFFERENTIAL to SINGLE-ENDED -  Your data acquisition board has an ADC that accepts a single-ended input of 05 V.  However, your signal source happens to be differential.  This signal may be generated from a sensor bridge where one leg swings positive while the other swings negative in response to pressure, for example.  

ADC Input Driver FULLY DIFFERENTIAL Amplifier -  In this series of ADC input drivers, we've created differential outputs using the obvioustwo op amps, one for the positive and one for the negative output.  Also, you need 8 resistors to accomplish the feat.  But, wouldn't it be grand if a single device produced with both positive and negative? 

ADC Input Driver SINGLE-ENDED to DIFFERENTIAL -  The continuing story of input drivers brings us to the case where your signal source is single-ended, but your ADC accepts a differential input.  For example, a position sensor that swings +/-10 V gets muxed to an ADC that expects a +/-4V differential input centered around 2 V.  What's the solution?

ADC Input Driver SINGLE-ENDED to SINGLE-ENDED -  Suppose your sensor produces a bipolar voltage swing of 10V.  The only problem, your ADC accepts a single-ended input of 05 V.  What you need is a circuit that will reduce your voltage swing

An Array of 180 UV LEDs -  I had been reading about and doing experiments with photo therapy to address my own skin problems when I learned that I know a person who is suffering from Lupus-like symptoms.  In my readings, I had seen mention of the use of various wavelengths to help Lupus symptom, and long wave Ultraviolet was mentioned the most.  At about the time I learned about the use of Ultraviolet light for Lupus, a friend of mine was traveling in Shenzhen, China, which may very well be the LED capital of the world.  He picked up 200 UV LEDs for me    (Thanks, Nam!) , and that is how this project got started.  This web page is not about photo therapy, it is about making a dense array of 180 5 mm T1-3/4 LEDs, not as a DIY contraction project, but to give people considering making such an array some ideas about how and how not to go about it.   __ Designed by Dick Cappels

AN49Illumination Circuitry for Liquid Crystal Displays -  Linear Technology AN49 __ Designed by Jim WilliamsAug 23rd, 1992

AN65A Fourth Generation of LCD Backlight Technology -  Linear Technology AN65 __ Designed by Jim WilliamsNov 1st, 1995

AN81Ultracompact LCD Backlight Inverters -  Linear Technology AN81 __ Designed by Jim WilliamsSep 1st, 1999

Attention-Getting Auxiliary Warning Light Flasher/Driver  The circuit shown in Figure 1 is capable of driving an LED array requiring up to several amps with a burst of flashes before coming on until power is removed.  It is intended to be used as an auxiliary warning light driver.  The initial burst of flashes is meant to enhance visual detection of the indicator coming on.   __ Designed by Dick Cappels

Audio Line Driver -  A stereo line driver for feeding long cables or buffering an audio source.   __ Designed by Andy Collison

Audio noise generator drives earphones or small speaker  -  This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker.  White noise creates is a "rushing" sound, which sounds something like air rushing by your ear    (s) .  White noise would be flat with frequency, and since this circuit rolls off within the audio range, I refer to it as "rolled-off" noise.  White    (or rolled-off) noise __ Designed by Dick Cappels

Avago Tech Note: 5MBd Digital optocouplers targeting low power/low supply voltage applications -  EDN-Design Ideas 01/22/2015    Digital optocouplers provide high voltage insulation and noise rejection for data transmission, with very low power usage Design by Avago Tech Note

Avago Tech Note: Driving & protecting inverter IGBTs -  EDN-Design Ideas 06/12/2014     A special purpose optocoupler can solve your IGBT gate-drive and fault-feedback needs Design 

Avago Tech Note: Reduce IGBT drive cost & space -  EDN-Design Ideas 06/11/2014    Use an application-specific optocoupler for an elegant solution to IGBT drive and monitoring Design by Avago Tech Note

Avago Tech Note: Smart gate-drive optocoupler with integrated flyback controller -  EDN-Design Ideas 03/13/2015   A smart gate-drive optocoupler for FETs & IGBTs is ideal for distributed power supplies, power inverters, motor drives, and more Design by Avago Tech Note

AVR 2x16 LCD & 4x4 keypad driver -  Connect some 2x16 characters LCD display and 4x4 keypad with AVR microcontroller __ Designed by Vassilis Serasidis

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