Which amp to build????

SteveT · 25th May 2005, 05:35 PM

I am going to build a chip amp but cant decide which design to go for. I want something that could drive Sub and full range speakers of various loads.
Electronics theory is not my strong point, but I can build most things with instructions.
SO.
Basically what I want is a well documented, indestructable, proven design that can output in excess of 100w.

ANY recomendations would be welcomed

Cheers

Steve T

Did I say it has to be cheap?

wxn · 25th May 2005, 06:06 PM

You need LM3886/LM4780 in parallel (up to 100W) or bridged/parallel (>200W)

Nuuk · 25th May 2005, 07:45 PM

Same advice I always give to these questions. Start with a simple GC and then build a high-powered one when you have some experience. There are a few tried and tested designs on my web site.

robselina · 25th May 2005, 10:30 PM

maybe this would be up your alley?

http://www.chipamp.com/lm4780.shtml

slackman · 26th May 2005, 08:19 AM

If you have boxes with impedances never go below 8 Ohms, you can try the bridged version of the lm4780 (or two separate lm3886).

This guy: http://tech-diy.com/LM4780_bridgedamp.htm
has a perfect pcb.

unfortunately it seems to be a little difficult to buy some lm4780 - they are out of stock in many shops an will be there in one ore two month...

planet10 · 26th May 2005, 08:51 AM

I'm with Nuuk on this... build a simple one 1st. 25-35 W. Then if you need more power build another and bi-amp. Most of the cost is in the power transformer...

In a bi-amp situation 2 25 W amps is approximately equivalent to a 100 W amp (& the system usually sounds better)

There is a general rule of thumb... smaller amps tend to sound better.

dave

matjans · 26th May 2005, 10:33 AM

i concur...

if i were you i'd build a lm3886 based amplifier (kit available from www.chipamp.com link above), a tried and tested design. It has more power than a lm3875 and is said to sound ~the same.

If that's not enough poof, biamp.

SteveT · 26th May 2005, 10:55 AM

Thanks Guys.
I will check out the links and have a good think.
Although this is my first amp, it is not by any means my first electronics project. I dont really want a kit, as I like to make my own boards. but yes I have to agree that starting small is probably the sensible thing to do.
But then again who wants to be sensible?

Thanks again.

Steve T

Nuuk · 26th May 2005, 12:21 PM

Quote:

But then again who wants to be sensible?

I know what you mean Steve. When I don't want to be sensible there is a friend that I go and see

but when it comes to electricity, I don't bring her home with me!

25th May 2005, 05:35 PM	#1
SteveT diyAudio Member Join Date: Apr 2005 Location: Surrey	Which amp to build???? I am going to build a chip amp but cant decide which design to go for. I want something that could drive Sub and full range speakers of various loads. Electronics theory is not my strong point, but I can build most things with instructions. SO. Basically what I want is a well documented, indestructable, proven design that can output in excess of 100w. ANY recomendations would be welcomed Cheers Steve T Did I say it has to be cheap?

25th May 2005, 06:06 PM	#2
wxn diyAudio Member Join Date: Sep 2003 Location: Vilnius	You need LM3886/LM4780 in parallel (up to 100W) or bridged/parallel (>200W) __________________ Nothing is as simple as it seems

25th May 2005, 07:45 PM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Same advice I always give to these questions. Start with a simple GC and then build a high-powered one when you have some experience. There are a few tried and tested designs on my web site. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

26th May 2005, 08:51 AM	#6
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	I'm with Nuuk on this... build a simple one 1st. 25-35 W. Then if you need more power build another and bi-amp. Most of the cost is in the power transformer... In a bi-amp situation 2 25 W amps is approximately equivalent to a 100 W amp (& the system usually sounds better) There is a general rule of thumb... smaller amps tend to sound better. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

26th May 2005, 10:33 AM	#7
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	i concur... if i were you i'd build a lm3886 based amplifier (kit available from www.chipamp.com link above), a tried and tested design. It has more power than a lm3875 and is said to sound ~the same. If that's not enough poof, biamp. __________________ Si fractum non sit, noli id reficere!


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25th May 2005, 10:30 PM	#4
robselina diyAudio Member Join Date: May 2005 Location: Socorro, NM	maybe this would be up your alley? http://www.chipamp.com/lm4780.shtml

26th May 2005, 08:19 AM	#5
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	If you have boxes with impedances never go below 8 Ohms, you can try the bridged version of the lm4780 (or two separate lm3886). This guy: http://tech-diy.com/LM4780_bridgedamp.htm has a perfect pcb. unfortunately it seems to be a little difficult to buy some lm4780 - they are out of stock in many shops an will be there in one ore two month...

26th May 2005, 10:55 AM	#8
SteveT diyAudio Member Join Date: Apr 2005 Location: Surrey	Thanks Guys. I will check out the links and have a good think. Although this is my first amp, it is not by any means my first electronics project. I dont really want a kit, as I like to make my own boards. but yes I have to agree that starting small is probably the sensible thing to do. But then again who wants to be sensible? Thanks again. Steve T

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