This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in parentheses are for the second channel. The circuit is suitable for old tape recorders.
This circuit is from 1992 documentation, but it is still up to date for its usefulness and the...
The circuit below for the LM3900 transconductance amplifier was suggested by National...
The signal from this circuit found in a 1968 Electronics World is sinusoidal and depends on the...