R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
Sine signals are converted into square signals by this simple circuit. The maximum frequency is...
This circuit was obtained in 1974. It serves to indicate the tuning of stations on a common...
March 2017 - Coilcraft SLR series inductors for currents up to 100 A can be obtained from Mouser...