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.
Found in National Semiconductor documentation this circuit converts a rectangular signal into an...
This 6-input mixer circuit is from 2004 documentation. The power source must have excellent...
This circuit trips, changing state, when the input voltage exceeds a value determined by R1 and...