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Control Circuits  Page 1-b
Last Updated on: Thursday, November 30, 2017 01:24 PM

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Circuits Designed by Dave Johnson, P.E. :


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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4-channel dimmer rack -  This document describes my light dimmer project I have made.  This document is nott....(electronic circuit added 04/05/06)
555 Timer Forms Simple PWM Motor Controller -  Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor….[Designed by David A. Johnson]
60W Linear Amplifier -  This is a RF Linear amplifier for QRO using power mosfet IRF840 with power out 60 Watts. It's simple all solid state circuit.….(circuit / schematic added 09/08)
68HC11 Read Encoder -  ….(Circuit design added 07/08/09)
68HC11 stepper Motor control -  (circuit / schematic design added 6/06)
68HC11 Synthesizes Accurate Sine Wave -  09/02/96 EDN-Design Ideas  You can use a 68HC11 and a 12-bit serial DAC (Figure 1) to generate accurate sine waves without using floating-point arithmetic..... [Design Idea by Mika Maaspuro, Espoo, Finland]
73 MHz Hallogene Lamp Radio-Controlled -  ….(design added 08/08)
8 Bit Digital Light Intensity Controller -  (circuit / schematic design added 6/06)
8 channel IR remote control -  This IR remote control that you can use to control other devices or circuits up to 8 devices. The control codes are sent in RC5 format modulated to about 38 kHz carrier frequency.The IR transmitter powered by the CR2016 which is a 3V button Cells Battery CR2016. To extend the life of the battery this is done by putting the CPU into SLEEP mode for most of the time and wake-up only when a key is pressed. ….(electronic schematic added 11/08)
8 Channel RF Remote Control -  This is an 8 Channel RF Remote Transmitter and Receiver that will allow to remotely control various electronic projects. RF Remote Control provides 2 latched and 6 momentary outputs that could be used to control your favorite devices such as amplifier, robotic devices, RC cars, computer, home appliances, lamps and many other cool gadgets. ….(electronic schematic added 11/08)
80C31 Stepper Motor Controller -  (electronic circuit added 4/05)
9v neon flasher -  Schematic only, no circuit description
9v Powered Xenon Photoflash Controller -  This 9v battery powered circuit is designed for remote control flash needs. A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged. A neon lamp is included to indicate when the system is ready to flash. …. [Designed by David A. Johnson]
A 24V/48V Hot Swap™ Controller -  DN226  Design Notes (Linear Technology) (app note added 1/06)
A 4-Digit Keypad Controlled Switch -  This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts.  This allows the circuit to operate as a general-purpose switch. I've used a SPCO/SPDT relay, but you can use a multi-pole relay if you wish....(electronic schematic added 05/09) [Designer Ron J.]
A 5-Digit Alarm Control Keypad -  This Keypad is suitable for the Modular Burglar Alarm. However, it has other applications. Entering the First Four Digits of your chosen Five-Digit code, will energize the relay. Entering the Full Five-Digit code, will de-energize it. [Circuit Designed by Ron J.]
A Cat or Dog Detector for a Pet Flap on a door. -  This circuit uses one tuned coil for on the door and just a single wire loop on the animals collar. When the two coils come close together, it produces a signal that can cause a an LED to light and also trips a solenoid to unlock the door so it can open. Since all these doors are somewhat different, I leave  ….(Circuit design added 3/08)
A Current Limiting Bench Power Supply -  This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.... [Circuit Designed by Ron J.]
A Low Cost Thermal Peak Detection NiCd Charger -  The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs.... [Stefan Vorketter]
A miniature high-rate speed control -  A miniature high-rate speed control published in  newsletter published by Electric Model Flyers' of Southwestern Ontario (diagram add 10/06)
A miniature low-rate speed control -  A miniature low-rate speed control published in  newsletter published by Electric Model Flyers' of Southwestern Ontario (diagram added 10/06)
A NEW Thermostat Control for Electric Heaters -    ….(electronic schematic added 12/08)
A Serial Infrared Remote Controller -  (electronic circuit added 4/05)
A simple Remote control Tester -  (electronic circuit added 10/05)
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