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Can I use a 50w 12v halogen bulb instead of LEDS on this cirucit? Answered

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I have Made this circuit (in the link  and pic) with one LED, It works great and its one of the best instructables I seenand built, mainly because its easy, simple and has a nice outcome. (the pic is not mine, its motadacruz's)

I would like to know if I could use this with a 50w halogen bulb?, providing I supply another wattage and voltage.

https://www.instructables.com/id/Music-LED-Light-Box/step6/Building-the-circuit/

Thanks

Oscar

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steveastroukBest Answer (author)2010-05-22

Not without some serious heatsinking of the transistor, and possibly uprating the transistor used.  Halogen lamps do not like being modulated like this

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user

Thanks for you comment, do you think it could handle 1-3w ?

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user

Ive been reading the data sheets it says The TIP 31C can handle 40w? and just to double check this is a product i am describing.

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user

There's no problem driving that, you SAID you wanted to drive a 50W halogen lamp originally.

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Its the closest I could find to a 50w halogen bulb!, i just wonder if it is bright enough?  I was thinking if I could split the load beetween some TIP 31C's? as I have already ordered the lighting transformer....before I published this. oops!

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Try the LED lamp. It will be more responsive to sound than the halogen lamp, and you can put 10 of 'em in the same circuit.

A halogen lamp needs a different transistor, or a different circuit to drive it. You could look at a 2N3055 instead, but it MUST be on a substantial heatsink.

Steve

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NachoMahma (author)steveastrouk2010-05-22

.  FWIW, the TIP31x is rated for 40W.

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steveastrouk (author)NachoMahma2010-05-22

...not enough, and Ic max = 3A, this thing'll pull 4+

Its going ti struggle !

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lemonie (author)2010-05-23

You're not going to get the same response from a halogen bulb. The heat-up/cool down time is significant, so you'd want fairly low-frequency on/off switching.
And for on/off switching you might think about a relay between the 12V and the transistor.

L

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oscarthompson (author)lemonie2010-05-23

Thanks for your comment, I thought that after I wrote that....I have some lighting cans which use them and they do not have very good response unless warmed up.

Thanks

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