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.
We found this circuit in a 1981 publication. Its purpose is to measure resistances of very low...
This circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...
This simple test circuit was found in the April 1983 issue of Radio Electronics magazine. The...