THE 555 TIMER - MONOSTABLE CIRCUIT V. Ryan © 2002 |
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When the 555 IC is used to produce an
MONOSTABLE circuit - it will only
pulse once. Monostable circuits can be used to turn lights/LEDs on or off
just once. They are also used in many more school based circuits. |
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When the switch is pressed current flows into pin 2. Current then flows out of pin 3 switching the transistor. Current can now flow from +9 volts to -0 volts and the LED lights. In this monostable circuit when the switch is pressed the LED only lights once. The switch has to be pressed each time for the LED to light. In this example the LED stays on for approximately 8 seconds. |
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