With a 475 V supply, this amplifier published in Radio Electronics magazine in January 1958 offered good power. The amplifier used 4 tubes.
In the figure we have a different configuration for an oscillator with the 555. This circuit was...
This circuit was found in a 303 Circuits issue of Elektor magazine from the 1990s. The circuit uses...
This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm...