This small tube amplifier appeared in Radio Electronics magazine in February 1958. The circuit is powered by the mains with a power transformer and output with different impedances.
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...
Found in a 1977 publication this circuit is relayed from a signal carrier in a receiver....