The circuit presented requires a simple 12 V supply and was suggested by Motorola in its 1990 Linear Databook.
This circuit was published in a 1977 English magazine, but remains current, since we can assemble it...
Circuits like this one, using the LM386 audio amplifier, are available from other sources in this...
This configuration from the 1970s can be applied to modern equivalent operational amplifiers. The...