This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio Electronics magazine. The circuit is supposed to use precision resistors.
The audio signal generated by the oscillator stage is amplified by an LM380 and reproduced with...
This old integrated amplifier is from a Japanese publication from 1972. The integrated circuit is...
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...