We found this circuit in a Radio Electronics from October 1963. The circuit uses an output transformer with a center tap. The trimpot is adjusted for higher gain and lower quiescent current.
This circuit, from a 1999 publication, uses an improvised optical coupler with LED or...
Found in Radio Electronics from the 90s, in the figure we have conventional voltage doubler with...
September 2016 - Mouser Electronics already has in stock the new IC TPS92515 LED driver from Texas...