This circuit was found in a Dutch documentation from 1970. The circuit makes use of semiconductors that have current equivalents and is indicated by a 0-5 mA milliammeter.
This circuit appears on the site in several variations depending on the source. This is from a...
This counter performs the same function as the 4020, but includes an internal oscillator. The...
Found in a 1968 Electronics World, this circuit uses operational amplifiers from that time. |...