stl_jones@yahoo.com
New Member
I finally got my circuit that gives a high (12V) output when a low frequency is on the input.
I've also found this circuit on instructables which does a good job of driving my high powered LED's. However, I'm having a little trouble switching this circuit. **broken link removed**
I've tried using a N channel power MOSFET to switch R3 to ground, but this is causing a slight problem because I am having trouble because the voltage on the drain is slightly higher than ground.
I think the best way to switch this circuit would be to just switch the LED's. I was thinking of hooking up a N channel MOSFET in between the cathode of the LED's and the drain of the MOSFET in the current control circuit. I'm not sure an N channel MOSFET is meant to be used this way, and I'm not sure how to use a P channel MOSFET for high-side switching applications. Thanks
I've also found this circuit on instructables which does a good job of driving my high powered LED's. However, I'm having a little trouble switching this circuit. **broken link removed**
I've tried using a N channel power MOSFET to switch R3 to ground, but this is causing a slight problem because I am having trouble because the voltage on the drain is slightly higher than ground.
I think the best way to switch this circuit would be to just switch the LED's. I was thinking of hooking up a N channel MOSFET in between the cathode of the LED's and the drain of the MOSFET in the current control circuit. I'm not sure an N channel MOSFET is meant to be used this way, and I'm not sure how to use a P channel MOSFET for high-side switching applications. Thanks