This interesting digital counter with relays with complementary outputs was found in the Radio Electronics magazine of October 1961. The supply voltage is in accordance with the relays used.
This traditional configuration from a simple 12 V source is from a 1977 publication. The...
The circuit is suitable for small animations, with the movement effect of the LEDs in a matrix...
This circuit is from the National Semiconductor 1977 FET Databook. The FET can be BF245 or MPF102...