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Last Updated: December 25, 2017 01:48 PM

Circuits Designed by Dave Johnson, P.E.

2 Pushbutton Motor ControllerTwo small pushbutton switches, a few diodes and two relays form a method to control on/off power to a brush motor as well as the motor direction.  The circuit was originally designed for a motorized lifting platform . . . Hobby Circuit designed by David Johnson P.E.-September, 2005

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

2 transistor lights LEDs -  04/09/09  EDN-Design Ideas A previous Design Ideasdescribes a circuit that uses an astable multivibrator to drive an LED   (Reference 1].  The circuit in Figure 1 uses a simpler alternative approach.  The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP trans __ Circuit Design by Barry A Tigner, Michigan State University, East Lansing, MI

2 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

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

2 Way IR Terminal -  This unit provide 2 way IR communications using a numeric keypad and an LCD display.  Data is sent and recieved in ASCII with no regard to what the data means to any particular device __ Designed by Luhan Monat-Mesa Arizona

2^16 remote control encoder & Decoder -  Control up to 16 remote digital output lines by this remote control encoder/decoder.  The encoder can transmit either using a radio module or an infrared LED.  The decoder outputs can be latched or momentary __ Designed by Peter Jakab

20 Amp 12 Volt Solar Charge Controller (kit available) -  The SCC3 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery.  It features easy setup with one potentiometer for the float voltage adjustment and an equalize function for periodic overcharging.  Automatic temperature compensation optimizes battery charging over a wide range of temperatures.  The SCC3 is robust, it can handle reverse polarity connection of both the battery and photovoltaic panel.   __ Designed by G. Forrest Cook

200W AdvancedTCA Hot Swap Controller -  The LTC4252 negative voltage Hot Swap controller allows a board to be safely inserted and removed from a live backplane.  Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault __ Linear Technology/Analog Devices App Note, Mar 26th 2010

200W Lamp Flasher -  200W Lamp Flasher kit is used to flash lamps, bulbs and halogen lamp to give your product that attracting look.   __ Designed by Rajkumar Sharma

20-36Vin to 12VoutAT16A 2-Phase Low Noise EN55022B Compliant uModule Power Supply -  The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply.  Included in the package are the switching controller, power FETs, inductor and all support components.  Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range of 3.3 V to 15V, set by a single external resistor.  Only bulk input and output capacitors are needed to finish the design__ Linear Technology/Analog Devices App Note, Apr 25th 2011

20A12/24V DC Motor Speed Controller Mk.2 -  This gutsy little speed controller has a wide range of applications and is simple to build and use.  There are no software settings to fiddle with but it does have some really useful features such as low-battery protection, soft start and adjustable pulse frequency.  It can run from 12V or 24V batteries at currents up to 20A.__ SiliconChip

20mA LED Ballast -    (corrected text) I use this circuit for general use to power white LEDs, like a headset light I use on my desk and a keyboard light for my computer.  I built it into a tiny Radio Shack project box   (270-288) , which y no longer sell.  I put heat-shrink tubing  __ Designed by Andrew R. Morris

220v AC Powered Blinking Led -  I needed a pulsating light for a certain signaling.  Voltage was 230V.  So I decided to make a simple circuit, consisted of a LED diode, two capacitors, two resistors, a diac and a diode.  Activity of the circuit is extraordinarily simple.  The capacitor charges by the diode and the resistor.  When the voltage on the

220V Blinking LED -  This is a simple blinking led circuit powered from 220V that can be used to mark special places or as voltage indicator.  The voltage from the mains charges the capacitor through R1 resistor and D1 diode.  

220V Non Dimming Ballast -  Efficient fluorescent lamps and magnetic ballasts have been the standard lighting fixture in commercial and industrial lighting for many years.  Several lamp types, rapid start, high output, and others are available for cost effective and special applications.  This user guide covers operation and development details of the non-dimmable version of our fluorescent ballast for operating a variety of lamps that are available today.   __ Designed by AT89RFD-10 / EVLB002

220V Solid State Flashing Lamp with 555 -  This 220V mains operated solid state flashing lamp circuit uses a 555 timer IC to control the ON and OFF times of a TRIAC which controls power to the load.  The power supply for the IC is obtained by half wave rectifier   (D1), a stabilizer circuit   (D2 and R1) and filter capacitor C1.  The lamp stays ON for about 1 second and OFF __ Designed by Popescu Marian

230 Volt AC Motor Controller -  Controls speed of230-Volt AC universal motor, in PDF format, text in Finnish __ Designed by spelektroniikka

230 Volt Dimmer -  Find out how to put together a simple but efficient PWM dimmer circuit for LEDs.   __ Designed by REUK-Renewable Energy UK website

230 Volts Flashing Lamps -  This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR.__ Flavio Dellepiane, fladello @ tin.it

230V Rotating & Blinking LED -  This design can be of some interest for those wanting striking light signs, as it can drive up to three 230V lamp strings in three operating modes.  The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer   (T1) and a full wave rectifier __ Contact: Flavio Dellepiane, fladello @ tin.it

230VAC 10A Full-Wave Motor Speed Controller -  This full-range Motor Speed Controller will give smooth control from near zero to full speed on electric drills, routers, circular saws, lawn edgers, food mixersin fact, any appliances with universal   (brush-type) motors.__ SiliconChip

24V Overvoltage Regulator Withstands 150V at VIN -  The LT4356 surge stopper protects loads from high voltage transients.  It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET.  The output is limited to a safe value thereby allowing the loads to continue functioning.  The LT4356 also monitors__ Linear Technology/Analog Devices App Note, Apr 26th 2010

24V/48V Hot Swap™ Controller -  DN226 Design Notes__ Linear Technology/Analog Devices

25 LED Chaser (Sequencer) -  A Fairly Simple C-Mos Circuit.   __ Designed by G.L. Chemelec

25 Light Sequencer using Xmas Lamps -  This circuit above can drive 25 small Xmas lights.  The lights operate at about 200mA and 3 volts.  The supply voltage is set to 5 volts and the 4017 counter output will drop about a volt using the 2N3053 transistors.  The voltage on the emitters of the rows transistors will be about 0.7 volts less than the base so the lamp voltage will be about 3 volts.  You can __ Designed by Bill Bowden

250-Amp Speed Controller for RC Cars -  Radio Controlled cars have increased in popularity from the time when they were first introduced.  Initially, they were little more than toys.  Now they have matured to an international sport.   __ Designed by Collin Mitchell

250ksps 16-Bit Micropower ADC offers an Excellent Combination of Size Power & Speed -  DN294 Design Notes__ Linear Technology/Analog Devices

28V Vehicle Application with Reverse Voltage Protection -  The LTC4366 surge stopper protects loads from high voltage transients.  By controlling the gate of an external N-channel MOSFET, the LTC4366 regulates the output during an overvoltage transient.  The load may remain operational while the overvoltage is dropped across the MOSFET.  Placing a resistor in the return line isolates the LTC4366 and allows it to float up with the supply; therefore, the upper limit on the output voltage depends only on the availability of high valued resistors and MOSFET ratings.  __ Linear Technology/Analog Devices App Note, Jan 16th 2012

2-CH RF Remote Control -  On these pages, I will introduce Remote Controller with Radio Frequency.  The electric wave sending-out is controlled with the code by PIC for transmission and the code is deciphered by PIC for receiving.  

2-chips simplify layout for high-end embedded control -  04/01/99 EDN-Design Ideas NOTE :  File contains many designs.   Scroll to this one.   If you are considering using one of the 32- or 64-bit RISC µPs from Integrated Device Technology  (IDT], the company’s new RC32134 and RC64145 system-controller ICs (Picture] can make your job easier.  The chips provide synchronous-DRAM, memory, and I/O control; a PCI interface; and peripherals, including UARTs, timers, and interrupt controllers.  The 32134 for the RC32364 µP provIdeas a glueless interface to DRAM Page includes several designs.   __ Circuit Design by Graham Prophet

2-Phase DC/DC Controller Makes Fast Efficient & Compact Power Supplies -  DN334 Design Notes__ Linear Technology/Analog Devices

2-Phase DC/DC Controller Reduces Capacitanceand Increases Battery Life in Portable Applications  -  Design Solutions 9 Design Notes  __ Linear Technology/Analog Devices

2-Transistor FM Transmitter -  While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over the little 1-transistor circuit that we've discussed previously this transmitter__ copy of geocities.com/tomzi.geo page

2-wire DC Lamp Dimmer replaces Rheostats -  10/23/97 EDN-Design Ideas Originally for use in commercial trucks, a low-cost dc lamp dimmer   (Figure 1) can control more than 100W of incandescent panel lighting and replaces a high-power rheostat, whose heating darkensinstrument panel.   __ Circuit Design by Kevan O'Meara, KO Systems, Chatsworth, CA

2-wire Lamp Flasher -  This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. __ Contact: Flavio Dellepiane, fladello @ tin.it

2-wire remote sensor preamp -  01/13/14  EDN-Design Ideas Locally condition and amplify a distant sensor using only a two-wire connection for both power and signalThis Design Idea implements a remote sensor preamp   (e.g., for a piezoelectric transducer) which transfers both signal and power over a single wire pair or coax __ Circuit Design by Vladimir Rentyuk

2-Wire Virtual Remote Sensing for Voltage Regulators -  Linear Technology AN126 __ Designed by Jim WilliamsOct 1st, 2010

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