This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that era and has a low impedance output. The resistance R1 depends on the impedance of the input signal.
This old configuration of an audio amplifier has a push-pull two-transistor output stage. Output...
This bandpass filter has a simple feedback system. The component values can be calculated using the...
This hysteresis comparator was found in the 1994 National Semiconductor Linear Applications...