Equivalent transistors can be used in this circuit for automotive applications in the 1980s. The frequency is given by the capacitor and the current of the lamp depends on the LM195 transistor.
This circuit triggers three incandescent light bulbs following the audio signal applied to its...
This circuit is from an American publication from 1973. We can implement it with the NF494 for the RF...
The presented circuit allows to control the valve of a tap. The positioning of the emitter and the...