The operational amplifier for this tone control found in a 1977 Signetics manual may be the 741. The power supply must be symmetrical and the signal cables short. The bass gain is 20 dB.
With this circuit found in a 1965 Electronic Design, it is possible to read a peak voltage of up to...
The circuit below for the LM3900 transconductance amplifier was suggested by National...
This switched stepdown regulator was found in a 60s documentation. It makes use of unusual...