This interesting circuit of the 50s uses a fluorescent lamp to obtain a stroboscope useful for the rotation of motors. The circuit uses a power valve to control the 10W fluorescent lamp.
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...
The purpose of this circuit, which we find in a 1975 radio amateur publication, is to measure the...
The coils of this simple mid-wave radius are wound 28 or 26 on a 12 to 30 cm long ferrite rod and the...