Electronic Circuits and Tutorials
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Opto-Isolator Couplers Circuits

Analog Opto Isolator:

Battery Powered Amplifier has Optical Isolation: 06/05/96 EDN-Design Ideas

Circuit compensates optocoupler temperature coefficient: 11/22/2001 EDN - Design Ideas /  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... .

Circuit Protects Computer's Input: 05/26/94 EDN-Design Ideas 

Circuit Widens octocoupler's Response to 1 MHz: 12/21/95 EDN-Design Ideas

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

Light Powers Isolation Amplifier: 01/21/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

OptoCoupled Gate Detects Motor Operation: 02/02/98 EDN-Design Ideas

Optocoupler isolates Shift Registers: 01/20/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Optocoupler simplifies power line monitoring: 01/10/2002  EDN - Design Ideas / The use of a linear optocoupler and a capacitor-based power supply yields a simple, yet precise power-line-monitoring system. The circuit in Figure 1 converts the 110V-ac power-line voltage to an ac output voltage centered at 2.5V, covering 0 to 5V. The circuit isolates the output signal from the power line.

Optocouplers are handy for motor drive: 06/13/2002  EDN - Design Ideas / Figure 1a shows a latching circuit based on an optocoupler, IC1. If the off switch remains closed, pressing the on switch powers the LED in the optocoupler. Thus, the transistor in IC1 turns on.

Optoisolator Block Occupancy Detector:

RS232 to RS232 Port Powered Optical Isolator: Brochure with schematic in PDF format

RS232C Circuit has Galvanic Isolation: 02/04/99 EDN-Design Ideas  / PDF contains multiple circuits - scroll to find circuit.

T Volt / Radio Antenna Cable Galvanic Isolator:

Temperature Sensor uses I2C isolator: 06/05/96 EDN-Design Ideas

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