This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
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...