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Old 1st November 2005, 09:13 AM   #1
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Default Want to build car amp to run a couple of 12" subs

Years ago in HS I built a 22w amp using the TDA1554 chip. I remember those amps being pretty strong, considering they cost like $10 to build. So I decided to build another one to run the midrange speakers in the car. I was hoping I could build 2 more of these and if possible bridge them together to get 44w x 2 to run a couple subs with them, is that possible? I havent decided exactly on what subs I want to use, but I will choose between a couple cheapo ones, one is rated at 160w rms 4ohms, and the others I think it says 350w rms 4ohms. I remember back when I built that amp, it could drive some pretty big speakers we had in class and sounded great, but I dont know about it being able to handle actual subs. If it cant, and I cant bridge a couple of them like I thought, is there an amp that I could build, that would be strong enough for them or maybe one with better sound quality?

BTW, I'm barely getting back into electronics, and what I did know at the time was very basic stuff which I hardly remember now, so dont be afraid to dumb down any answers for me.

Thanks in advance.
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Old 1st November 2005, 06:46 PM   #2
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tda1554q v.good amp.i built one(my first:-) and its still running with supeb performance even after abusive use.the2*22w already bridged so cant be bridged again.
for car subs,u need atleast 50w continous.go for tda7294 or 93 if u need clarity throughout the spectrum.use lm3886,76 or 75 if u need more heavy bass,for that u will have to build car smps.see at www.sound.westhost.com
easy to make.

if smps and all this stuff feels like an overkill use tda7565 with onboard dc dc converter so it can give enough power to shake up the woofers.its costly but its damn simple to realise and has good power o/p.
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Old 1st November 2005, 11:44 PM   #3
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Dumb question but what is a car smps? Also, I tried searching for tda7565 at digikey and mouser and couldnt find anything.
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Old 2nd November 2005, 04:13 AM   #4
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cool!
dont take me rude but is it really that u know nothing?
if u r using tda7565 then u needent use smps(switching mode power supply ,,,to convert +12 of car battery to + - 30v or higher to run power amps)

but if u feel that power from tda7565 will not suffice,then build smps and use it to power up amp made from lm3886,76 etc.on google,u will find all info bout constructing amp with these chips.

link for smps::::
http://www.sound.westhost.com/project89.htm

link for tda7565 datasheet::::
http://www.st.com/stonline/products/...re/ds/9800.pdf

link to st page boput the ic::::
http://www.st.com/stonline/books/ascii/docs/9800.htm

do search on google to buy this ic.
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Old 2nd November 2005, 09:14 AM   #5
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Yeah, I really dont know much, but thanks for answering my questions. If I can find a tda7565, I'm just going to build one, I assume I can just use the schematics from the datasheet, and see if its strong enough, if not I can always find another good use for it. The other one I was considering was this one http://www.freeweb.hu/majki/elektro/...lips_2x55w.pdf which uses a tda1562q though I dont think that one produces the 55w continously.

The smps might be a bit much for me to build, it seems like it wouldnt be a good idea for a newbie like me to try and design a PCB for something that complex, seems a bit dangerous.

While searching on google I saw somebody used a power supply from an actual car amp to run an lm3886. You think it would be a good idea to find a broken amp to try and use its power supply?
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Old 2nd November 2005, 09:28 AM   #6
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that thing is wonderful.i tried to find myself a broken amp so i could use its supply for my amp.unable to find a decent one i built smps for myself of 900w continous.
use the power supply from amp,hook up to lm series.don use tda1562,fake power figures.
there is a site something as chipamp .com ,it sells kits of lm.u can use them(but i dont call it diy to assemble the kits;;spoonfeeding).
rest is up to u.

****before u start building anything u need to have info on basics like good soldering,certain other parameters which result in realisation of professional like(no noise or errors) ckts.so visit the link and read it thoroughly b4 going forward***********
http://www.kpsec.freeuk.com/
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Old 3rd November 2005, 10:57 AM   #7
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Some advice on the subs... One decent 12" sub may end up sounding better then a couple of cheap ones, especially if you have limited amounts of power for it.

I like your idea about using the supply from a broken amp, as long as you can find one where you're sure it's not the supply that's broken. Plus you can build your amp into its chassis, use its heatsink, etc.

Building a switching supply with enough power for your amp could be tricky, it's easy to mess them up and end up with a very noisy supply.
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Old 4th November 2005, 07:27 PM   #8
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So I started looking for broken amps today. Would any amp rated at like 300w have a strong enough power supply to run one of the lm3886 amps?
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Old 5th November 2005, 04:27 AM   #9
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yes,its sufficient.more than enough.
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Old 5th November 2005, 04:06 PM   #10
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The voltage of a 300 watt amp power supply may be too high for an LM 3886, +/- 42 VDC is the absolute limit.
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