The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
MCP19124/5 Contains Independent Voltage and Current Control Loops Plus a Full Suite of...
A flash of light on one sensor or the touch of your fingers on the other type of sensor will turn...
This 1-transistor timer was published in Radio Electronics magazine in December 1960. The circuit has...