Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz. Modern equivalent transistors can be used.
This circuit was found in the September 1974 issue of Radio Electronics magazine. It consists of a...
This circuit was found in a 1995 documentation, eventually requiring two resistors in series with...
This amplifier was found in Burr-Brown documentation from the 90's. The gain can be programmed by resistor...