1 Magic LM317 flashing light, adjustable flashing frequency.
The LM317 is often used as an adjustment component in voltage regulators. Here is an unusual application. A small 12V bulb can be illuminated by a small number of external components.
As shown in the figure, using the given component parameter values ​​and signals, when the circuit is turned on, the small bulb will flash at 4 Hz. Of course, if the component parameters (R2 or C2, R2 or C2 are changed, other corresponding resistors) Or the capacitance value is changed to be the same as R2 or C2), the frequency of flashing will also change. To make the flashing light stop flashing, drive T1 with a voltage of >1V.
Since the LM317 itself transmits a current of >1A, the circuit can automatically limit the turn-on current, so the life of the bulb is quite long.
2 flasher / light control the circuit is
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