Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to obtain now as it is of the era. The circuit is intended for FI ceramic filter circuits.
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
The frequency of this oscillator varies between 7 and 30 MHz when someone approaches the sensor...
This conventional 3-terminal regulator circuit was found in an Electronics Now from the 90's. The...