This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response of 150 Hz to 40 kHz. The power supply must be symmetrical.
The circuit presented uses the high-power operational amplifier LM12, which is currently not an...
Suggested by Philips documentation from 1968, this circuit uses components from the era that can...
This highly sensitive circuit causes one relay to be closed when the other is open or still...