Dimmer circuit

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kacade

Member - Posts: 2

Joined: January 25, 2006

Location: United Arab Emirates

Posted: January 30, 2006 at 1:38 AM / IP Logged

Hi, I'm a new member from UAE

I am doing a dimmer circuit for my son's project in school. I have 12 Vdc battery at 2.2 Ah and a 12V 50W halogen bulb. I cannot find a 12Vdc dimmer in our place. I found one 12V dimmer switch but when i ask the sales person if it works on a 12V battery supply, his answer was no. Is there a possibility to use that 220Vac or 12Vac dimmer switch with my stuff, 12Vdc, 2.2Ah battery and 12V 50W halogen bulb?

rldestura

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: January 30, 2006 at 11:23 AM / IP Logged

An AC dimmer will not work, as AC dimmers basically are used to 'chop' some of the AC waveform to reduce how long the lamp is lit.

Look into these topics:

dimmer switch problems

Resistor for daytime running lights

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kacade

Member - Posts: 2

Joined: January 25, 2006

Location: United Arab Emirates

Posted: January 30, 2006 at 10:27 PM / IP Logged

I am trying to install, instead of using a dimmer switch, 4 way switches with resistors in each terminals. Does putting resistor in each terminal dims the light of the bulb?

rldestura

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: February 01, 2006 at 3:01 PM / IP Logged

Best thing to do is to use diodes to drop the voltage, the following is based on using silicon diodes which typically drop 0.7 volts. You would want diodes rated for 5 amps, or 2 3-amp diodes in parallel would work. Data Table follows

Diodes Volts Lumens Brightness

- 0 12.00 100% 100%

- 1 11.30 82% 66%

- 2 10.60 66% 43%

- 3 9.90 52% 27%

- 4 9.20 41% 16%

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Dimmer circuit

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