This circuit is from an ancient American documentation. The integrated circuit is 741 and the power supply must be symmetrical. The passing band is centered at 1 kHz.
This circuit without any capacitor operates based in the time the transistor need to turn on. The...
The component used in this circuit is not very common today as the circuit is from the 80's. It...
This circuit was found in old documentation. The components can be replaced by modern ones. The...