This narrowband data receiver is from the Philips Databook of 1990. The circuit is powered by 5 V and N1 has 3.21 turns, N2 1 turns with Q = 16.
Placed in the vicinity of a telegraphic transmitter (CW), this circuit produces an audible signal on...
Damped oscillators can be used to produce sound from percussion instruments such as the triangle, bell,...
We found this circuit in a 1983 English magazine, but it can be easily assembled with the BC548...