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 circuit divides the voltage of a source by 2, allowing its use as a symmetrical source. In...
This circuit is regulated by zener and provides a voltage of 9 V. The circuit is from a Radio...
There are several manufacturers of the TL061. The configuration given specifically was taken from...