In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The circuit is by Philips from an old documentation.
Found in a Popular Electronics from the 90s, this circuit uses a double 555 to emit beeps when the...
This circuit was obtained from National Semiconductor documentation from the 1990s. The circuit has a...
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...