This circuit multiplies the input voltage by 3 and can work with up to 12 V input. The current is a few mA. We found it in the Radio Electronics magazine of December 1992.
This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a...
This RF wattmeter was found in an American 1980s documentation. The components are common and the...
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...