This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to keep constant the audio signal level of a system, increasing the lower signals.
This pocket-sized VHF receiver was found in Radio Electronics magazine from January 1961. It uses...
Found in 1980s documentation, this oscillator uses an integrated TTL Schottly. The supply must be...
The transistors of this circuit may be the BC548 or BC549 and its power supply can be performed...