This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a good heat sink and the speaker must be able to withstand the full power of the circuit.
We found this speed control for miniature cars in an American publication from the 70s. With...
The sample and hold circuit used in analog to digital converters shown below was found in the...
This circuit was found in an English magazine from 1978, but it is still current, just change the...