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Analog Opto Isolator - (circuit / schematic added 2/03) |
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Balanced Floating Output Stage Circuit - A great output topology based on a
design by George D Pontis (circuit design added 08/08/08) |
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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. Posted ….(designed
by David A. Johnson) |
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Battery Powered Amplifier has Optical Isolation - 06/06/96 EDN-Design Ideas: When
you interconnect scientific instruments, especially older ones, you often need both
gain and galvanic isolation for analog interface functions.....(design idea
added 6/03) |
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Circuit compensates optocoupler temperature coefficient - 11/22/01 EDN-Design
Ideas: When using an optocoupler in a linear application, you should consider its gain
drift with temperature. Traditional singleand 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 added
1/05) |
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Circuit Protects Computer's Input - 05/26/94 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
input.....(design idea added 3/03) |
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Circuit Widens Octocoupler's Response to 1 MHz - 12/21/95 EDN-Design Ideas:
(design idea added 3/03) |
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Cross coupled gates prevent push pull driver overlap - 05/15/08 EDN-Design Ideas:
Cross-coupled gates in the push-pull drive of a center-tapped transformer's primary
prevent overlap.....(design idea added 09/08) |
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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 added 3/03) |
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Dual Amp For Use with Opto Compressor Project - PCB.ZIP containing schematic and
gerber files. (circuit added 08/08/08) |
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Dual JFET-992/993 PCB schematic - (electronic circuit added 08/08/08) |
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Dual Mike Preamp power supply Gerber - (electronic circuit added 08/08/08) |
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Dual Transformerless Class A Discrete Mike Preamp - Uses JMP-1 Modules
(circuit design added 08/08/08) |
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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) |
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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) |
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Improved optocoupler circuits reduce current draw resist LED aging - 12/14/07 EDN-Design
Ideas: With improved optocoupler circuits, you can enhance the accuracy of
zero-voltage sensing.....(design idea added 9/08) |
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JFET Double Balanced Mike Preamp - Based on a design by Graeme Cohen AES Preprint
#2106 (circuit design added 08/08/08) |
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JFET Mike Preamp using Jensen JE16 Input Transformer - (electronic circuit added
08/08/08) |
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JFET992/3 Summing Amplifier Circuit - Summing buss and amplifier circuit for an
Audio Console design (circuit design added 08/08/08) |
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Jitter Detector Input Part #1 of a 2 part schematic - (electronic circuit
added 08/08/08) |
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Jitter Detector Output Part #2 of a 2 part schematic - (electronic circuit added
08/08/08) |
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Jitter Modulator - (electronic circuit added 08/08/08) |
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Light Powers Isolation Amplifier - 01/21/99 EDN-Design Ideas: Self-powered
isolation amplifiers, which need no external isolated power supply, provide versatile
and convenient interfaces in many applications that require galvanic isolation of the
signal source. Examples of such applications include circuits that serve in industrial
or medical environments, in which isolation.....(design idea added 11/05) |
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Machine Power Loss Beeper - For some medical equipment it is important for an
operator when power is lost to the machine. The beeper is powered from a 9v battery
and requires the machine to have a power switch with a third set of contacts.
….(designed by David A. Johnson) |
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Mike Preamp Power Supply with Phantom Power - Uses a single 48 VAC center-tapped
transformer (circuit design added 08/08/08) |
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NEC Single & Multi-Channel Optocouplers 3/20/03 - Application Note California
Eastern Laboratories Doc #956 (app note added 6/06) |
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Negative 0.5 Volt Supply - With the component values shown, this simple circuit
will provide a negative 0.5 volts at about 2 milliamps. It is perfect for rail
to rail op amp circuits, where a true 0 volt output is needed. ….(designed by David A.
Johnson) |
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Novel circuit isolates temperature Sensorfrom its host - 08/03/06 EDN-Design
Ideas: Temperature-to-period converter and transformer driver provide power and signal
isolation.....(design idea added 10/06) |
