How to add 12v lamps to circuit?
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Posted by on July 28, 2008, 11:09 pm
Please log in for more thread options I have this circuit, the standard Velleman mk103 sound to light kit. I would like to control 2 20w 12v lamps. I've got some TIP142 transistors that should be OK to do the switching, I just don't know how to tap into the output to make it work. I've been trying to tap just before the first LED but this is giving a very limited response. What's the best way to do it? Steve | |||||||||||||||||||
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Posted by ehsjr on July 29, 2008, 4:15 pm
Please log in for more thread options Come off the collector of T4 on the existing circuit through 1K to an optoisolator. Use that to turn the TIP142 on/off: 4N25 +--------------+--- +13.2 ------ | | T4---[1K]---|1 6| [4.7K] | | | | /e Gnd(9V)-----|2 5|---+---[470R]---| TIP142 | | \c |3 4|---+ | ------ | | | [Lights] | | +--------------+--- Gnd(13.2V) Shown is a 13.2 volt supply for the lights to make up for the voltage drop in the TIP42. Ed | |||||||||||||||||||
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Posted by Kasterborus on July 30, 2008, 10:57 am
Please log in for more thread options Thanks for your help - I will try this...
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Posted by Kasterborus on July 30, 2008, 11:13 am
Please log in for more thread options > Thanks for your help - I will try this...
I only have the 4n29 - which appears to be a darlington arrangement - this should drop right in to replace the '25 - correct? | |||||||||||||||||||
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>
> I have this circuit, the standard Velleman mk103 sound to light kit. I
> would like to control 2 20w 12v lamps. I've got some TIP142
> transistors that should be OK to do the switching, I just don't know
> how to tap into the output to make it work.
>
> I've been trying to tap just before the first LED but this is giving a
> very limited response.
>
> What's the best way to do it?
>
> Steve