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Old 24th June 2006, 03:48 AM   #1
PassiveO is offline PassiveO  United States
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Default DIY Amplifier Modules

Greetings to All,

Does there exist a DIY solid state amplifier module capable of passing current such that 100w @ 8Ohms, 200w @ 4Ohms and 400w @ 2Ohms can be obtained?

I'd like to build something capable of driving the vast majority of speakers available.

My abilities are limited to building a linear power supply from scratch, hence the reference to modules, and not schematics, etc.

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Old 24th June 2006, 04:44 AM   #2
es44 is offline es44  Denmark
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Location: Fredericia, DK
Look around for "simple killer amp", and i'm sure you will find something useful.
Greg's project is higly praised all over, and as far i understand, is easy to get up and running.
( I haven't build one yet, but it's on top of my wish-list)
Greg's homepage

Best regards
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Old 24th June 2006, 10:25 AM   #3
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
100W into 8r is easy to find and build. There is lots of choice in designs and kits.

200W into 4r will involve slightly more cost, fairly easy to build and many design/kits available.

400W into 2r is becoming quite speciallised. More difficult to find kits and due to current and multi paralleled devices becomes more difficult to build. Very much more expensive.

Do you really intend driving 2ohm speakers?

BTW. any amp that produces slightly more power than you want can be scaled down by selecting the correct mains transformer.
eg. the Leach is specified as a 120W into 8r using a 40Vac transformer. It will produce about 95W into 8r using a 35Vac transformer. It can also be scaled to work into 4ohm loading by doubling up the output devices. In the Leach clone thread there is a 3pair design that will work well into 4ohms and meet the spec you require for speakers of 4 ohm or higher. There is also a 5pair design that may work down to 2ohm but ask the PCB designer (Jens) for advice.

Finally, an amp that pushes 400W into 2r will manage a lot more than 200W into 4r, probably nearer 230W to 250W and into 8r more like 150W. Unless that was the purpose of your question.
regards Andrew T.
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Old 23rd November 2009, 11:16 PM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
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Have a look on ebay eBay - The UK's Online Marketplace
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
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Old 23rd November 2009, 11:18 PM   #5
runebivrin is offline runebivrin  Sweden
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Necro thread!
Do wizards use spell checkers?
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Old 23rd November 2009, 11:20 PM   #6
tinitus is offline tinitus  Europe
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DIY Amplifier Modules
If you can afford them, aussie mr Holtons bigger modules should do it

But a 60watt will be cheaper and do just as good
Done right it will drive anything as you request

Last edited by tinitus; 23rd November 2009 at 11:28 PM.
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