These basic bass controls were obtained from an article in Electronics Now magazine in February 1995. They are basic passive circuits in (a) basic tone, (b) boost, (c) cut, and (d) flat response.
The circuit shown is a commercial electronic voltmeter sold in Japan in the 1960s. The circuit is fully...
This common configuration source was obtained from old documentation, so the components can be...
Connected to the output of a small amplifier or receiver, this circuit triggers a relay in the...