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.
The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We...
This circuit was obtained in a 1969 Mullard manual. The transistors are from that time. The input...
August 2017 - STMicroelectronics' BlueCoin development environment is available at Mouser...