Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an old tape recorder. It can be adapted for other purposes.
This circuit was found in a 1980s American documentation. Operational amplifiers are from that...
Pressing S1 by a moment L1 glows up, remaining by a time interval depending on C1. This time...
This circuit causes a bicolor LED or two LEDs of different colors to alternately flash at a...