This circuit is from March 1978 Radio Electronics. The 4-digit circuit uses a period module and is battery powered. The main integrated circuits are CMOS and TLL.
May 2017 - Panasonic's new APS1 series of optical couplers with 3 750 V insulation and up to 50...
This circuit can detect both light and shadow using an LDR as a sensor. We found the circuit in an...
This simple megaphone is from old documentation, but uses still current components. The circuit is...