I am trying to build a light lamp that draws about 3 amps at 1.5 volts that uses a 555 timer to trigger it on for about 10 seconds. It needs to also include two LEDs, one green that tells when the lap filament is working and a red one that tells when the filament is broken.
The power source is around 5 volts and I figure that the lamp itself could be the resistor for the green LED. So far the circuit I have is the positive going to 4 and 8 pin, the 1 pin going to ground, the 2 pin is going to positive with a 100k resistor and a switch going to ground, pins 6 and 7 have a 500k resistor going to the positive leg and a 10uf going to negative for the time period. Pin 3 goes to the bulb and then to the green LED, then connected to ground.
A few questions: First, should I connect pin 5 with a capacitor to ground? What would be the voltage coming off pin 3? Could it handle 3 amps? Im guessing about 2ish volts to the bulb. I was thinking using a 1.5 volt regulator from pin 3 to go to the bulb. I don't think there is any problem with the circuit to that point. I was thinking of how to trigger on the red LED and turn off the green one when the filament is bad. My guess would be to use two transistors, but not sure how to trigger them.
One thought I had was to use a relay triggered by pin 3 to draw directly from the 5v in to power a secondary circuit that would be able to better handle the amperage. Still unsure how to make the LEDs trigger in relation with the bulb filament.
Basically, the circuit is: you push the momentary switch, and it powers the lamp and green LED for 10 seconds (LED indicating that the lamp is lit and working), or triggers the red LED if the filament is broken.
Any help would be greatly appreciated. Thank you in advance.
The power source is around 5 volts and I figure that the lamp itself could be the resistor for the green LED. So far the circuit I have is the positive going to 4 and 8 pin, the 1 pin going to ground, the 2 pin is going to positive with a 100k resistor and a switch going to ground, pins 6 and 7 have a 500k resistor going to the positive leg and a 10uf going to negative for the time period. Pin 3 goes to the bulb and then to the green LED, then connected to ground.
A few questions: First, should I connect pin 5 with a capacitor to ground? What would be the voltage coming off pin 3? Could it handle 3 amps? Im guessing about 2ish volts to the bulb. I was thinking using a 1.5 volt regulator from pin 3 to go to the bulb. I don't think there is any problem with the circuit to that point. I was thinking of how to trigger on the red LED and turn off the green one when the filament is bad. My guess would be to use two transistors, but not sure how to trigger them.
One thought I had was to use a relay triggered by pin 3 to draw directly from the 5v in to power a secondary circuit that would be able to better handle the amperage. Still unsure how to make the LEDs trigger in relation with the bulb filament.
Basically, the circuit is: you push the momentary switch, and it powers the lamp and green LED for 10 seconds (LED indicating that the lamp is lit and working), or triggers the red LED if the filament is broken.
Any help would be greatly appreciated. Thank you in advance.
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