The circuit below was suggested by the Motorola Linear Databook of 1990. The component used is uncommon and the power can be between 7.5 and 12 V.
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...