Photodiode amplifier (CB20691E)

This high-gain circuit was found in American documentation from the 1990s. The operational amplifier supports a modern equivalent.

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Varistor Modulator (CB21915E)
Taken from a 1956 Raytheon transistor manual, this circuit uses varistors to obtain modulation of a signal...
AC amplifier TL062 (CB15301E)
TL064 can also be used in this amplifier suggested by Motorola's Linear Interface ICs of 1993. The...
General Purpose Preamplifier (CB10980E)
This circuit was obtained in a 1982 English magazine of 1982. This circuit has three external...