This timer was found in English documentation from the 80's. The integrated circuit is common nowadays and the MOSFET admits equivalent according to the controlled load.
This FM receiver tuning step circuit was found in a 1960 documentation. No information about the...
This power supply for TTL and CMOS circuits with a voltage of 5 to 15 V was found in the Special...
This is a direction of rotation control for a small motor up to about 2 A with the indicated...