Found in a 1924 documentation, this circuit is powered by 3 batteries, two of which are high voltage. The output is a high impedance headphone jack.
This circuit was found in an English magazine from 1973. The magazine no longer exists, but the...
January 2017 - Mouser Electronics is introducing new, ultra-thin Vishay Displays OLED modules. The new...
This circuit is from the 1960 Mullard transistor manual. The transistors are germanium from the...