This circuit has the intensity of the signals controlled by the light that falls on the sensor. Note that it is not a frequency-controlled oscillator. Equivalent transistors can be used.
Suitable for operation with high impedance microphones, this circuit was found in American...
Found in a 1969’s documentation, this circuit can supply currents from 100 to 120 mA at loads of...
The MC1436 can also be used on this circuit found in Motorola's 1993 Linear Interface ICs. The...