Gain 10 Voltage Amplifier (T456E)

This 4-stage circuit has a voltage gain of 10 and negative feedback. The circuit was found in an old MIT publication.

Transducer amplifier (CB9064E)
This circuit applies to other operational ones, other than the one indicated. The formulas next to the...
Phonocaptor Preamplifier with Tone Control (CB13925E)
We found this circuit in the Audio Handbook of the National Semiconductor of 1977. The circuit is used...
Photometer (CB12055E)
This photometer was found in an English magazine in 1981 but can still be mounted today with...