This TV remote control receiver uses a ratchet system to activate an old drum-type selector to change channels. A common system at the time. The circuit is from a Radio Electronics from February 1961.
Using a 555 this circuit was found in old documentation, but it is still valid. | Clique na imagem...
This circuit was obtained in a 1976 magazine. We can use the 555 and another BC548 to generate square...
The circuit presented here shows how two flip-flops of a 4027 can be connected to perform a...