This excellent tube preamplifier was found in Radio Electronics magazine from July 1958. The power supply was not included. The circuit has several inputs.
This timer has a divider programmed by BCD switches. The circuit is from a Radio Electronics...
This circuit, from the 1977 GE semiconductor manual, uses a unijunction transistor beyond the...
This high impedance circuit uses a 12 V lamp to test voltages in a car. We found it in a Popular...