This circuit is suitable for the calibration of old analog oscilloscopes. It was found in documentation from the 1970s and could be useful if someone is recovering an oscilloscope of the time.
This circuit, suggested by National Semiconductor, is a tone control (bass and treble) with high...
We found this circuit in a 1991 Hobbyst Electronics. The circuit makes use of an unusual...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...