12V x TTL Coupler (CB24896E)

The figure shows how to use a 12 V signal to trigger a TTL gate using an optical coupler. The circuit is from Radio Electronics from May 1985.

Light disturbance detector (CB8522E)
This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular...
741 Preamplifier with Balanced Output (CB13673E)
This circuit was found in a 1975 documentation. Operational amplifiers must have a symmetrical source and...
Non-Inverting Amplifier LM3900 (CB4029E)
This configuration can be applied to other transconductance operationals. The circuit has a gain...