This 600 kHz circuit is designed to locate a lost boat anchor. The circuit has a range of up to 10 meters. The transistor admits equivalent.
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...
This small amplifier, with output less than 1 W, was found in a 1960 transistor manual from...