 LED Dash Dimmer Circuit Project, Need to know the resistance of the Light dimmer potentiometer |
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| Spoke |
 Jul 3 2020, 09:28 AM
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Jerry  Group: Members Posts: 6,979 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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I've been working on a circuit to allow the use of LEDs for dashboard instrument lighting and give complete dimming from 100% down to 1-5%. The circuit will provide a PWM output and will work with LEDs and incandescent bulbs.
Circuit simulations show very good functionality and linearity over the full range of dimmer adjustment. Since the light switch potentiometer is relatively low resistance, when changing to LED dash lights, the LEDs tend to dim just a bit then turn off. This circuit would provide a ballast resistor to sense the change in resistance of the pot. One thing I need though is the range of resistance of the potentiometer of the light switch. If anyone has a light switch laying around, I would appreciate a measurement of the resistance from bright to off. It looks like the pins for the pot are 58b (12V power) and 58a (dimmed output to the bulbs). |
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Posts in this topic
Spoke LED Dash Dimmer Circuit Project Jul 3 2020, 09:28 AM
914werke quick chk with my cheap dvm 200ohm range is from 3... Jul 3 2020, 10:15 AM
Spoke
quick chk with my cheap dvm 200ohm range is from ... Jul 3 2020, 12:38 PM ClayPerrine
quick chk with my cheap dvm 200ohm range is from... Jul 3 2020, 12:52 PM Chris914n6 Might help... not once have I turned the dash ligh... Jul 3 2020, 05:28 PM  |
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