Beginners first amp - what to choose?

Nis · 13th April 2010, 08:25 AM

What amp should I choose to make?

My compact stereo have developed quite a bad hum, even with no input and the volume turned all the way down. So naturally I want to build my own. I can solder and have some training in electronics, but that's about it.

I have researched different kits a bit, chipamp.com & audiosector.com, which seems like nice kits, but I'm feeling too inexperienced to be sure about what to buy.

I have a pair of Dali Concept 1's: 8ohm, 87db. From what I've read about them 20w. should be enough for our room, but that's a guess on my part

What I would like is an amp that plays well with my speakers, has a thorough guide (including powersupply) and is simple to build. A volumecontrol would be nice as well.

Does anybody have any recommendations?

AndrewT · 13th April 2010, 11:34 AM

go to decibel dungeon. read.
go to ESP. read.
search this Forum. read.

As a side note, my opinion is, that 87dB/W and chipamps are not a good combination.

Nis · 13th April 2010, 11:52 AM

Thanks Andrew. I hadn't found the ESP site before you mentioned it. I have, however, read a lot on Decibel Dungeon and here.

Why is my speakers and chipamps not a good combination? Sound quality?
What kind of amplifier should I be looking at instead? I liked the simplicity of the chipamps.

AndrewT · 13th April 2010, 12:07 PM

I too like the simplicity of chipamps.
But, I find the current limits in chipamps cripple the potential performance of the system when low efficiency speakers are used at anything above normal conversation level. Quite adequate for background music while washing the dishes.

Wait till you see the flames/grenades fly!

mikje · 13th April 2010, 12:17 PM

I built an AudioSector LM3875 amp. The online support, especially from Peter Daniel, was excellent. As far as speakers for it; I built a pair of Fostex FE127 Fonkens. This set-up works great together.
I don't know what your listening requirements/habits are, but I like a wide variety of music and I listen in a carpeted room that's approximately 12x16x8.
Mike

Nis · 13th April 2010, 12:57 PM

I could always build a chipamp, and then have an excuse for building a set of speakers.
(Nobody tell my girlfriend I said that

)

I'll check out those speakers, Mike.

bobodioulasso · 13th April 2010, 01:34 PM

To build an amplifier around a driver chip (LME49810 and brothers) and a discrete output stage is worth to be considered too IMO. The amount of power is scalable and implementation is quite simple.
See datasheets and several threads about here.

13th April 2010, 08:25 AM	#1
Nis diyAudio Member Join Date: Mar 2010	Beginners first amp - what to choose? What amp should I choose to make? My compact stereo have developed quite a bad hum, even with no input and the volume turned all the way down. So naturally I want to build my own. I can solder and have some training in electronics, but that's about it. I have researched different kits a bit, chipamp.com & audiosector.com, which seems like nice kits, but I'm feeling too inexperienced to be sure about what to buy. I have a pair of Dali Concept 1's: 8ohm, 87db. From what I've read about them 20w. should be enough for our room, but that's a guess on my part What I would like is an amp that plays well with my speakers, has a thorough guide (including powersupply) and is simple to build. A volumecontrol would be nice as well. Does anybody have any recommendations?

13th April 2010, 12:17 PM	#5
mikje Soakin' up the Sound! diyAudio Member Join Date: Feb 2008 Location: Bismarck, ND	I built an AudioSector LM3875 amp. The online support, especially from Peter Daniel, was excellent. As far as speakers for it; I built a pair of Fostex FE127 Fonkens. This set-up works great together. I don't know what your listening requirements/habits are, but I like a wide variety of music and I listen in a carpeted room that's approximately 12x16x8. Mike __________________ Marantz PM8003 amp, Squeezebox Touch, DIY Krystals Jolida SJ502B, Mark Audio Alpair 10.2s

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13th April 2010, 11:34 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	go to decibel dungeon. read. go to ESP. read. search this Forum. read. As a side note, my opinion is, that 87dB/W and chipamps are not a good combination.

13th April 2010, 11:52 AM	#3
Nis diyAudio Member Join Date: Mar 2010	Thanks Andrew. I hadn't found the ESP site before you mentioned it. I have, however, read a lot on Decibel Dungeon and here. Why is my speakers and chipamps not a good combination? Sound quality? What kind of amplifier should I be looking at instead? I liked the simplicity of the chipamps.

13th April 2010, 12:07 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I too like the simplicity of chipamps. But, I find the current limits in chipamps cripple the potential performance of the system when low efficiency speakers are used at anything above normal conversation level. Quite adequate for background music while washing the dishes. Wait till you see the flames/grenades fly!

13th April 2010, 12:57 PM	#6
Nis diyAudio Member Join Date: Mar 2010	I could always build a chipamp, and then have an excuse for building a set of speakers. (Nobody tell my girlfriend I said that ) I'll check out those speakers, Mike.

13th April 2010, 01:34 PM	#7
bobodioulasso diyAudio Member Join Date: May 2008	To build an amplifier around a driver chip (LME49810 and brothers) and a discrete output stage is worth to be considered too IMO. The amount of power is scalable and implementation is quite simple. See datasheets and several threads about here.