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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

Master Category List - Dave's Circuits

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Opto-Isolators/Couplers

0.5v Negative Supply  -  Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, . . . [Circuit by David Johnson P.E.,  07/13/06]


2-12v Battery Isolator Circuit with a LTC4412  -  Linear Technology has just announced a neat little chip (LTC4412) . It has been designed to be used in conjunction with an external P-channel power FET, to form an ideal diode function with a very low 0.05v voltage drop. The chip monitors the voltage on eit . . . [Hobby Circuit designed by David Johnson P.E.,  08/07/08]


Generate 0.5v Negative Supply  -  A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat . . . [Hobby Circuit designed by David Johnson P.E.,  07/10/11]

Low-power optical interrupter  -  This circuit is great for battery-powered systems that use slotted type optical interrupters. It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery . . . [Circuit by David A. Johnson P.E.,  06/04/00]


Negative 0.5 Volt Supply  -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output. Note:  This circuit is not particularly efficient . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/13/06]


Optical Interrupter Draws Microamps  -  This circuit is great for battery-powered systems that use slotted type optical interrupters. It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery . . . [Circuit by Dave Johnson P.E.,  06/04/00]


Simple Negative Supply Circuit  -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output. Note:  This circuit is not particularly efficient . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/13/06]


Slotted-Type Optical Interrupter Draws Microamps  -  This circuit is great for battery-powered systems that use slotted type optical interrupters. It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]


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