This circuit provides a logic output signal when the voltage exceeds a certain value. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of...
Originally indicated as an alarm alert in a 1990s US publication, this circuit can be used as a...
Found in a 90s Popular Electronics, this transistorized circuit generates pulses from 2 Hz to 50...