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Remote Control Circuits, Page 1
Last Updated on: Friday, April 25, 2008 08:00 AM
Remote Controllers:  #'s - H       I-P      Q-R       S-V
Circuits Designed by Dave Johnson, P.E. :

  • 1uS LIGHT PULSE RECEIVER PLUS POST AMP
    This circuit is designed to detect very weak light pulses lasting 1uS. It uses a tuned LC feedback network to provide high sensitivity while giving high ambient light immunity. A post voltage amplifier is included with a gain of about X20. The circuit is described in more detail in the receiver section of my Handbook of Optical Through the Air Communications.  Note: The LF357 op amp is no longer available, this circuit is for reference only.

  • 30KHZ LIGHT RECEIVER AMP
    This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery.

  • 40KHz LASER BURST DETECTOR
    This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst, modulated at 40KHz. It is very sensitive and could be modified for long-range laser communications.

  • 40KHz LIGHT RECEIVER IS IMMUNE TO AMBIENT LIGHT
    If you want even more sensitivity than the above circuit, try this design. When used with a one-centimeter square photodiode, you can achieve a range of several hundred feet with a standard TV or VCR remote control module.

  • 40KHz MODULATED LIGHT DETECTOR
    This circuit uses a unique cascode amplifier circuit to convert the current from a PIN photo diode to a current without any feedback network. It is very stable and very sensitive. The circuit shown has the potential for a conversion factor of 10 volts per microwatt at 900nm. I included a simple JFET post-amplifier with a gain of about 20.

  • 40KHZ LED TEST SIGNAL GENERATOR
    This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals.

  • 40KHz TV-VCR LIGHT SOURCE REPEATER
    This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

2 Line Intercom Plus a Telephone Changeover Switch:  The circuit presented here can be used for connecting two telephones in parallel and also as a2-line intercom. FAIR WARNING -- THIS SITE HAS ANNOYING POP UP ADS. (Electronic circuit added 5/02)

2 Wire Remote Microphone Amplifier :  (Electronic circuit added 7/03)

300 MHz AM RF Remote Control System:  (Electronic Schematic / circuit added 4/02)

35KHz Magnetic-Radiation Remote-Control:  (Electronic circuit added 4/05)

A Serial Infrared Remote Controller:  (Electronic circuit added 4/05)

AC-power monitor uses remote sensing:  04/26/01 EDN-Design Ideas  / (Circuit / schematic design added 6/06)   

AN-1262: Four-Speed Fan Control using Simple Remote Diode Temperature Sensor:  National Semiconductor - Application Note   (Circuit / schematic design added 6/06)

AN-146: FM Remote Speaker System:  National Semiconductor - Application Note   (added 2/06)

AN531: Intelligent Remote Positioner:  Microchip Application Note - Published 26-Aug-97   (added 2/06)

AN728: Remote Keyless Entry and Convenience Center Reference Design with LIN Bus Interface:  Microchip Application Note - Published 26-Sep-02   (Circuit / schematic design added 6/06)

AN796: TC7109 Records Remote Data Automatic ally:  Microchip Application Note - Published 12-Nov-02   (Circuit / schematic design added 6/06)

Battery operated remote temperature sensor Drives 4 to 20 mA Current loop:  12/17/04 EDN Design Ideas  /  (added 1/05)  You can remotely measure temperature using a 4- to 20-mA current loop as long as 4000 feet and a battery-powered, white-light LED driver. You usually configure this equipment to provide a programmable, constant current to an LED from a battery source. The TPS62300 series of ICs, for example, converts a battery voltage of 2....

Building an RF Remote Control System:  (Electronic circuit added 4/05)

Camera remote Control system using Basic Stamp:  (Electronic circuit added 4/05)

Celsius to digital thermometer Works with remote sensor:  04/15/04 EDN Design Ideas  /  (added 1/05)  You can use a single-supply system to precisely measure the temperature at a remote location with less than 1°C error over a 0 to 100°C range (Figure 1). The circuit includes T1, a low-cost AD590 temperature sensor; IC1, an AD8541 rail-to-rail amplifier; four resistors; a trimming potentiometer; and an ADC....

Child's Lamp:  (Electronic Circuit / Schematic added 10/04)

Clap Switch:  (Electronic Circuit / Schematic added 10/04)

Combination Controlled Fully Customizable RF Remote Control:  (Circuit / schematic design added 6/06)

Computerized Infrared Remote:  control your stereo, TV and VCR from Windows, includes schematic and software (Electronic circuit added 5/02)

Creating Remote Controller Waveform using PPG:  Toshiba 870X Series Application Note  (added 2/06)

Decoding Infrared Remote Controls:  (Electronic Schematic / circuit added 4/02)

DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing:  App Note 203: Maxim IC  (Circuit / schematic design added 6/06)

Fire Stick infrared Remote Control:  (added 8/03)

FM Remote Speaker System:  National Semiconductor - Application Note   (added 2/06)

FM RF Remote Control (88-108 MHz):  1KM Range  (Circuit / schematic design added 6/06)

Four Channel RF remote Control:  (Electronic circuit added 4/05)

Four way remote control uses series transmission:  01/18/01 EDN - Design Ideas / (addes 08/05)  A simultaneous four-way remote-control system adheres to size, cost, and reduced-complexity constraints and uses a series transmission to drive parallel loads (Figure 1). You can use this system as long as the time constant of the load is much larger than the total transmission time for all data. With these considerations, this design can drive any object with four simultaneous controls as motors.

Four-Speed Fan Control using Simple Remote Diode Temperature Sensor:  National Semiconductor - Application Note   (Circuit / schematic design added 6/06)

How to Build a 300MHz AM RF Remote Control System:  (Electronic circuit added 4/05)

Remote Controllers:  #'s - H       I-P      Q-R       S-V

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