Inverter Amplifier (CB6431E)

This high input impedance circuit was found in a Popular Electronics of the 90s. The circuit supports modern operational.

Light bean alarm (CB6427E)
Found in a 1990s US publication, this alarm circuit detects when a light beam is interrupted. Optical...
1979 Digital Multimeter (CB24580E)
This circuit for a commercial compact digital multimeter was found in the March 1979 issue of...
Two Channel Lamp Flasher (CB16320E)
The flasher we present was found in a 1982 publication, shown in the figure. What we have is a...