This circuit for communications receivers was found in the January 1974 issue of Radio Electronics magazine. The transistors are Japanese types of the time, as the circuit was part of equipment of that origin.
We found this circuit on the internet. The components are current, and the time depends on C1...
This circuit was found in an English publication of 1982. The operational can be replaced by an...
With this luminous remote control, which we found in a 1990 publication, using a flashlight you...