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Old 26th May 2006, 09:46 AM   #1
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Default My First DIY Amp

Its compleated. It all came about from being given one of the boards. Its a Mosfet amp that was a maplins kit. GA28F. I cloned it and now I use it as a bridged amp for my sub. The box was found in the back of a store cupboard the rest was bits i had lying around. So i didnt have to buy much for it. Any questions just ask, any comments feel free.


Its my first Amp i have made so i thought i would share it here cos this site has been useful to me in compleateing this project.

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Thank you for looking
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Old 26th May 2006, 10:09 AM   #2
Wynand is offline Wynand  South Africa
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Congratulations...Well done.
Are you happy with the sound?
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Old 26th May 2006, 10:16 AM   #3
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so far i am, but you know how these things turn out though, I dare say it will get changed at some point, but I am very happy really because I made it myself and that is half the fun isnt it. Making something then sitting back and knowing whats going on inside because you made it.
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Old 26th May 2006, 10:29 AM   #4
Wynand is offline Wynand  South Africa
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Yup. And cursing when it blows.
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Old 26th May 2006, 10:35 AM   #5
Wynand is offline Wynand  South Africa
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I've got a 500VA toroid trannie that I took the secondaries off and wound it myself. So the problem is that everytime I see a new/better/different design, I want to rewire it to fit the design.

I'd like to build a "complete amp". Preamp-tone-headphone amp-psu(!?)-mic input the works. 6 channels would be nice

The problem is that I'd like to design it myself, but I'm too scared(read: overwhelmed) to. I've tried 3 or 4 boards but didn't work.
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Old 27th September 2006, 11:17 AM   #6
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Unhappy Schematic for the Ga28?

Do you by any chance happen to have the schematic or parts listings for these? I have 4 of these from some time ago and would love to build them up (finally)

I must say, that's a nice amp for a first, and amazing job cloning the board!
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Old 27th September 2006, 12:16 PM   #7
jaycee is offline jaycee  United Kingdom
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If it's the board I think it is (with the two TO-3 mosfets), then it's just the Hitachi sample app schematic. You should be able to find that easy enough.
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Old 27th September 2006, 02:44 PM   #8
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Well done, diy pcb?
Is one transformer shielded and second not?
Aren't PCBs too close to transformers?
Any hum?

keep on diying!

cheers
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Old 28th September 2006, 01:25 AM   #9
Leolabs is offline Leolabs  Malaysia
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What kind of material of the casing???
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