Found in a 1947 publication, this 7-tube amplifier uses four tubes in the output stage. The circuit uses a power source with a transformer.
This circuit is from an old 1967 publication. The circuit uses a programmable unijunction...
This simple rhythmic light circuit uses a 110 V to 220 V transformer and can hold a good number of...
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...