SCR with led

571

09:50:38

How to run:
- Press middle button to turn led on, press left button to turn led off.

Explanation:
- Transistors used as a SCR (silicon controlled rectifier).
- 47k resistors used as pull-up and pull-down resistors to make sure transistors don't conduct until pressed.
- 470 resistor limits current into circuit at all times, protecting the led, and preventing a short circuit when the off button is pressed.
- Position of the led is important to make sure it is always on while the on button is being pressed (try moving it just before the PNP transistor to see the difference).

published 10 years ago

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