weekendshock
New Member
Hi,
I am trying to power a 12 volt-6watt LED lamp that comes on a dusk and goes off at dawn. Long story, but I had a circuit that a friend built several years ago.
It consisted of a photo resistor, Schmitt trigger, 2N2222 transistor, 50K ohm trim pot and a 1K ohm resistor.
The Schmitt is triggered it closes 2n2222, which closes ground to lamp which is discrete from power ground. The transistor is supposed to open and close the ground leg going to the lamp, which it does. My problem is the transistor becomes very hot and soon fails. This circuit worked excellent in the past with these components and I am trying to duplicate with limited success.
What I am doing works. If I can get the transistor to stop overheating I will be fine.
I know you are probably laughing because this is so simple to you, but it is way over my head and any assistance would be so appreciated.
Thank you,
I am trying to power a 12 volt-6watt LED lamp that comes on a dusk and goes off at dawn. Long story, but I had a circuit that a friend built several years ago.
It consisted of a photo resistor, Schmitt trigger, 2N2222 transistor, 50K ohm trim pot and a 1K ohm resistor.
The Schmitt is triggered it closes 2n2222, which closes ground to lamp which is discrete from power ground. The transistor is supposed to open and close the ground leg going to the lamp, which it does. My problem is the transistor becomes very hot and soon fails. This circuit worked excellent in the past with these components and I am trying to duplicate with limited success.
What I am doing works. If I can get the transistor to stop overheating I will be fine.
I know you are probably laughing because this is so simple to you, but it is way over my head and any assistance would be so appreciated.
Thank you,