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.
This amplifier with complementary symmetry output and good sound quality was found in...
This circuit should be placed between the signal source and the input of a recorder or amplifier....
Found in an Electronics World of 1968 this circuit can use current SCRs and the diodes are...