This is another of the circuits with the LM380 that we have in this section. We found it in an article about Walkman amplifiers in the Radio Electronics magazine of March 1986.
This second-order filter was found in American documentation and can be applied to almost any...
This circuit is based on documentation from the 1980s. It can be designed with modern operational...
This circuit is from an English magazine from 1978. The circuit can be assembled with BC557, BC547...