TecNicL
Computer
- May 21, 2003
- 1
Hello all!
I need to construct a circuit that will cause an LED to selectively blink or stay on steady. The brightness needs to be adjustable and, when blinking, the rate of blink needs to be adjustable. The blink rate need only vary from about 1 second to about .25 second at 50% duty cycle.
I have found on the web a circuit made up of a 555 timer set up as an astable multivibrator with a few potentiometers to vary the blink rate and brightness and powered by a 9V battery. This works very well to blink the LED, but not being an electrical engineer, I'm not sure how to alter the circuit to make the LED stay on steadily.
The LED in question is rated at:
Forward Voltage: 2.4VDC +/- 0.3V (5VDC max)
Forward Current: 40mA max
Reverse Voltage: 6VDC
Power Dissipation: 100mW
Any ideas are appreciated.
SC
I need to construct a circuit that will cause an LED to selectively blink or stay on steady. The brightness needs to be adjustable and, when blinking, the rate of blink needs to be adjustable. The blink rate need only vary from about 1 second to about .25 second at 50% duty cycle.
I have found on the web a circuit made up of a 555 timer set up as an astable multivibrator with a few potentiometers to vary the blink rate and brightness and powered by a 9V battery. This works very well to blink the LED, but not being an electrical engineer, I'm not sure how to alter the circuit to make the LED stay on steadily.
The LED in question is rated at:
Forward Voltage: 2.4VDC +/- 0.3V (5VDC max)
Forward Current: 40mA max
Reverse Voltage: 6VDC
Power Dissipation: 100mW
Any ideas are appreciated.
SC