My First DIY Amp

hungeryhippie · 26th May 2006, 09:46 AM

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.

Thank you for looking

Wynand · 26th May 2006, 10:09 AM

Congratulations...Well done.
Are you happy with the sound?

hungeryhippie · 26th May 2006, 10:16 AM

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.

Wynand · 26th May 2006, 10:29 AM

Yup. And cursing when it blows.

Wynand · 26th May 2006, 10:35 AM

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.

paradoxsm · 27th September 2006, 11:17 AM

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!

jaycee · 27th September 2006, 12:16 PM

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.

darkfenriz · 27th September 2006, 02:44 PM

Well done, diy pcb?
Is one transformer shielded and second not?
Aren't PCBs too close to transformers?
Any hum?

keep on diying!

cheers

Leolabs · 28th September 2006, 01:25 AM

What kind of material of the casing???

26th May 2006, 09:46 AM	#1
hungeryhippie diyAudio Member Join Date: Nov 2005	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. Thank you for looking

27th September 2006, 11:17 AM	#6
paradoxsm diyAudio Member Join Date: Sep 2006	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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26th May 2006, 10:09 AM	#2
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Congratulations...Well done. Are you happy with the sound?

26th May 2006, 10:16 AM	#3
hungeryhippie diyAudio Member Join Date: Nov 2005	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.

26th May 2006, 10:29 AM	#4
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Yup. And cursing when it blows.

26th May 2006, 10:35 AM	#5
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	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.

27th September 2006, 12:16 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

27th September 2006, 02:44 PM	#8
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Well done, diy pcb? Is one transformer shielded and second not? Aren't PCBs too close to transformers? Any hum? keep on diying! cheers

28th September 2006, 01:25 AM	#9
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	What kind of material of the casing???