Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
The LED ring is not just LEDs. There are current limiting resistors. There fore it is working fine in voltage mode. It is fine to vary the voltage to change the brightness. Probably (almost no) current below 9 volts. Probably full current at 14 volts. (because of resistors)Cliff, Are you trying to vary the brightness of the LEDS?
LED are not voltage controlled, they are current controlled.
YOU can use PWM to vary the brightness.
A 12 volt DC PWM motor controller like this would work fine.
**broken link removed**
Yes PWM runs full voltage duty cycles so the average power changes with duty cycle.A PWM unit (if I am correct) imposes an on off cycle to the line current - - yes? The speed of the on/off determines the amount of energy reaching the load thus the brightness of the lamp, LED or motor speed. Faster cycles = brighter lights or faster motor speeds. Am I correct thus far?
The current limiting resisters.What then would you say is the reason my LED rings illuminated differently at different voltages.
It bears noting that the retailer (when they had them for sale) claimed they ran at 9 - 14 VDC at 3 watts. The retailer said nothing about dimming them.
I dont think you can find one to handle the power the LEDs need cheaply.So can I just wire a pot inline with the out-put leads
Me too. But it can be done.Swapping those resistors out would be a task way to fiddly for me.