Originally this circuit was created to produce synchronism pulses in TV cameras SSTV (Low scan frequency), however it can be adapted for other purposes. The integrated circuits are common TTL.
Found in a 90s Popular Electronics, this sensor operates by infrared reflection. The components are...
This circuit, which can act as a shield, was found in a 1990 PE Hobbyst Handbook. The circuit...
This circuit was found in an old American manual. It is intended for testing SCRs and thermistors using...