Found in a Popular Electronics from the 90s, this circuit can be used as an electrifier. T1 can be an old TV fly back transformer or an ignition coil.
Found in the February 1997 Electronics Now magazine, this circuit controls motors according to the...
This circuit detects traffic problems on a miniature railway by triggering an alarm. The circuit was...
This circuit uses 3 FETs to convert the high impedance signal from a crystal or ceramic microphone to a...