This circuit uses the LM2931 which is not a common component today. What it does is to activate a lamp causing it to blink at a frequency determined by the capacitor.
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This circuit also makes use of a field effect transistor (JFET) which can be the BF245 and has an...
We can use this circuit to connect low impedance microphones and even small speakers used as a...
When S1 is in 1, the circuit operates with of half the total power applied to the load. When in...