This PNP transistor power stage was found in the May 1969 issue of Radio Electronics magazine. The circuit uses a transformer for excitation and requires 10W input for full output power.
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...