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Old 13th October 2010, 08:24 AM   #1
pirate.machine is offline pirate.machine  Australia
diyAudio Member
Join Date: Aug 2008
Location: Melbourne, Australia
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I am looking for advice on which amplifier to build.

Before I get yelled at for looking for a spoon feeding let me explain....

I'm a long time lurker on this website, always wanting to get started but never actually doing anything about it (until now).

I took up Electrical/Electronic Engineering at university 3 years ago with the idea that somehow I'd magically know how to make an audio amplifier at the end of the course. (no need to remind me how naive I was ok...)

So now I'm faced with 3 months of summer holidays and a desire to start my first amplifier project.

I will be using this amp with purely digital sources (computer).

My knowledge level is probably low by this sites standards. I have however gained some useful skills at uni.

I am fairly proficient at Alitum Protel DXP and can easily manufacture *almost* professional looking PCB's at uni. My soldering skills are fairly good too, I have built a few electronics projects before, just nothing audio.

So what I am looking for is some advice on where to start. I realize this question gets asked every other day on this forum, so thanks for your patience.

What I am looking to build:

Integrated Amplifier driving these (also looking to build this summer): DD8-MkII

I think they are somewhat inefficient at 85db, so perhaps 100watts would be adequate to drive them loudly/clearly?

Class AB? I think I am leaning towards BJT's.

I listen to a fairly wide range of music, my favorites are nightmares on wax, cinematic orchestra, hip-hop, dance, sometime rock. I guess I like the bass to be more pronounced, and I like to have it really loud with no distortion if possible.

Budget: I would be prepared to spend about 700-1000 AUD's on this amp, if it was less then that would be a bonus.

My previous amplifier was a yamaha rx-v550, which I use with my tv for movies etc.

I don't have any parts at hand. I will be building this project entirely from scratch. Also I don't particularly want to build a kit, as this is as much about learning about where to source components from + learning building techniques as it is about the end product.

Thanks for any advice!
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Old 13th October 2010, 12:00 PM   #2
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
buy your resistor stock in packs of 100. Probably the same for diode stock.
Rapid in the UK, sell 600mW 1% 50ppm (1/4W size) metal film (MF60) for ~ 1.50/100.
I even bought 1000 1r0 (12) for multi series/parallel duty around the output stage.
Buy a plug board to experiment.
If you can afford it, buy secondhand scope, signal generator, bench DMM and laboratory supply (dual outputs with dual meters is very handy).
regards Andrew T.
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Old 13th October 2010, 04:17 PM   #3
jcx is offline jcx  United States
diyAudio Member
Join Date: Feb 2003
Location: ..
biamping is one of the diy options that could take your system beyond consumer mid-fi

for the woofer a "chip amp"; bridged, paralleled if you want more power

then a discrete design at only 1/2 the woofer amp's power would match the tweeter senstivity


linkwitz for active xover

are all places to start searches for debugged project amps

where's our wiki for all of this?
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