This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern equivalents. The circuit was originally designed to control a motor.
This circuit for analog video signals was found in a 90s 303 Circuits. The used digital switch is...
Operating in the FM range, this is one of the many versions of FM transmitter that the reader can...
This circuit was found in a 1987 magazine. It measures monitors the heartbeat through electrodes. The...