This circuit was found in a 90s Motorola documentation. The circuit uses two SCRs that must be chosen according to the controlled load. The time depends on CE.
This receiver with two common JFETs was found in an old English documentation. The phone is...
This TTL circuit with the 7493 makes the binary count of the pulses sent by a flip-flop with the...
This circuit was found in a Popular Electronics from the 90s. The counter circuit is not common...