This receiver circuit was found in a Hands On Electronics from the 90s. The circuit uses a PLL 561B that is not a common component today.
This traditional complementary circuit produces three different ones, adjusted in the...
This circuit from a 2001 publication converts binary values programmed in 4 keys into hexadecimal values...
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...