This 1968 Mallory circuit uses an uncommon integrated circuit today. The circuit has a 30 to 20,000 Hz response with lower power and is powered by 12 V.
Found in a 2005 Linear Technology application manual, this circuit provides 12-bit resolution output...
This amplifier, obtained in an Argentinian publication of the 1970s, provides a 6 W output. The...
This circuit was obtained from an American 80's documentation. The operational ones can be...