This unijunction transistor trigger pulse generator circuit was found in the March 1973 issue of Radio Electronics magazine. Typical values for Re CT are 100k and 220 nF.
This circuit was published in a 1977 Radio Shack catalog. The PNP transistor may be BD135 and NPN...
This battery charger was found in a Popular Electronics from the 1980s. Voltage regulators must be equipped...
The commercial MT2B receiver manufactured in Japan in the 1960s had a listening device only and...