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 Texas Instruments INA826S Instrumentation Amplifier Evaluation Module is available from Mouser...
This circuit uses a FET and a BJT to give a x300 gain for the input signal. So a 50 mV signal at...
This circuit was found in an old 1980s valve documentation. The circuit can directly replace a...