This hybrid audio amplifier from National Semiconductor was found in the June 1994 issue of Electronics Now magazine. It is powered by 24 V.
The configuration shown in the figure is a second order filter (12 dB per octave) with an...
We found this circuit in Radio Electronics magazine from May 1967. The circuit has the tuned...
This circuit is from a 1977 Signetics manual. BC107 transistors can be replaced with BC547 and...