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Opto-Isolator Coupler Circuits, Page 1
Opto Isolators:   #'s - J      K - O        P - Z
Last Updated on: Thursday, April 07, 2016 01:00 PM


Circuits Designed by Dave Johnson, P.E. :
  • Battery Isolator:  This circuit uses a few p-channel power FETs and a new IC from Linear Technology.  It allows an alternator to charge two different lead-acid batteries but isolates the individual battery loads, so that loads on one battery do not draw power from the other battery.  This configuration is often used on recreational vehicles.  It is rated at 28v and up to 50 Amps

  • Fully Isolated 50/60Hz Sync Generator
    This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation.
  • HONEYBEE COUNTER
    I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive. The low power circuit uses a slotted opto-sensor to detect the passing bees. The circuit advances an electronic counting module whenever a honeybee passes through the sensor. The device only counts the number of bees going through the sensor. A different circuit would be needed to count the number of bees only going out or only coming into the hive.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Analog Opto Isolator -  (circuit / schematic added 2/03)
Balanced Floating Output Stage Circuit  -  A great output topology based on a design by George D Pontis  (Circuit design added 08/08/08)
Battery Isolator -  This circuit uses a few p-channel power FETs and a new IC from Linear Technology.  It allows an alternator to charge two different lead-acid batteries but isolates the individual battery loads, so that loads on one battery do not draw power from the other battery. This configuration is often used on recreational vehicles.  It is rated at 28v and up to 50 Amps. …. [Hobby Corner Circuit by Dave Johnson]

Battery powered Amplifier has optical isolation -  6-Jun-96 Issue of EDN  When you interconnect scientific instruments, especially older ones, you often need both gain and galvanic isolation for the analog interface functions.... [Design Idea by W Stephen Woodward, Venable Hall, University of North Carolina, Chapel Hill, NC]
Circuit compensates optocoupler temperature coefficient -  22-Nov-01 Issue of EDN  When using an optocoupler in a linear application, you should consider its gain drift with temperature. Traditional single- and dual-transistor-output devices have a notable gain drift with temperature. In recent years, some temperature-compensated optocouplers have appeared. However, another option is to use two optocouplers or a dual optocoupler with appropriate feedback to make the dri.... [Design Idea by J Michael Zias, Acme Electric Corp, Cuba, NY]
Circuit Protects Computer's Input -  05/26/94 Issue of EDN-Design Ideas....The circuit in Fig 1 performs input protection, level translation, isolation, and debouncing. The circuit allowed the output of a relay driver to connect to a computer even though the relay driver delivered a voltage as high as 24V and the relay driver had no ground connection. With the values in Fig 1 the low and high thresholds at the circuit's.... [Design Idea by Ang Tzu Seng, Halliburton Drilling Systems, Singapore]
Circuit Widens Octocoupler's Response to 1 MHz -  12/21/95 EDN-Design Ideas.... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
Cross coupled gates prevent push pull driver overlap -  15-May-08 Issue of EDN  Cross-coupled gates in the push-pull drive of a center-tapped transformer's primary prevent overlap.... [Design Idea by Richard Rice, Oconomowoc, WI]
Drive High-Voltage Varactor Diodes From just 5V -  03/27/97 EDN-Design Ideas.... How to connect two International Rectifier (El Segundo, CA]PVI1050s photovoltaic-isolator ICs in series to provide a20-Volt tuning drive for the varactor diode…. [Design Idea by Steve Hageman, Hewlett-Packard Co, Santa Rosa, CA]
Dual Amp For Use with Opto Compressor Project -  PCB.ZIP containing schematic and gerber files.   (circuit added 08/08/08)
Dual JFET-992/993 PCB schematic -  (electronic circuit added 08/08/08)
Dual Mike Preamp power supply Gerber -  (electronic circuit added 08/08/08)
Dual Transformerless Class A Discrete Mike Preamp  -  Uses JMP-1 Modules  (Circuit design added 08/08/08)
Fully Isolated 50/60Hz Sync Generator -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation.  (added 12/04) …. [Designed by David A. Johnson]
Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive. The low power circuit uses a slotted opto-sensor to detect the passing bees. The circuit advances an electronic counting module whenever a honeybee passes through the sensor. The device only counts the number of bees going through the sensor. A different circuit would be needed to count the number of bees only going out or only coming into the hive.... [Designed by David A. Johnson]
Improved optocoupler circuits reduce current draw, resist LED aging -  14-Dec-07 Issue of EDN  With improved optocoupler circuits, you can enhance the accuracy of zero-voltage sensing.... [Design Idea by Peter Demchenko, Vilnius, Lithuania]
JFET Double Balanced Mike Preamp -  Based on a design by Graeme Cohen AES Preprint #2106  (Circuit design added 08/08/08)
JFET Mike Preamp using Jensen JE16 Input Transformer -  (electronic circuit added 08/08/08)
JFET992/3 Summing Amplifier Circuit  -  Summing buss and Amplifier circuit for an Audio Console design  (Circuit design added 08/08/08)
Jitter Detector Input  Part #1 of a 2 part schematic -  (electronic circuit added 08/08/08)
Jitter Detector Output Part #2 of a 2 part schematic -  (electronic circuit added 08/08/08)
Jitter Modulator -  (electronic circuit added 08/08/08)
 
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Opto Isolators:   #'s - J      K - O        P - Z


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