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.
This circuit converts a constant input current intensity into a voltage given by Vo = -R x I. T1...
In this circuit the output voltage depends on the light that falls on the LDR, decreasing when the...
) This is the original application of the National Semiconductor LM3909 low consumption pulsator. The LED...