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Old 9th December 2013, 08:23 PM   #11
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Thanks for all the replies! I think I am going to go with Peter Daniel's LM4780 kit
in a parallel configuration. Hopefully this will be a comprimise between a successful build and a high quality finished product..

DIY Chip Amplifier Kits, PCB's, Components and Information.

I'm going to power it with a :
Avel Y236750 330VA 25V+25V Toroidal Transformer | 122-640

and possibly upgrade and snubberize the reservoir caps with these:

Invalid Request

and the recommended 3.3 nF caps and 0.1 ohm resistors from daniel's PSU schematic (any part no.'s for those would be appreciated)

If anybody has any links to a easy to work with aluminum project boxes and a good Pot recommendation then I think the first project is in sight and it should be a whopper.

please correct me if I am missing the mark!
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Old 9th December 2013, 08:45 PM   #12
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by jackinnj View Post
Inverting the input to the chip with a buffer/inverter really improves the way it sounds, and a servo is simple to implement and reduces the probability of tears.
A regulated supply, exotic parts, dual mono construction, rf-shielding and perhaps even the 'My Ref' .... I agree that there are gains to be made but for a newbie wanting to make a project with his dad over the Christmas break I honestly believe anything beyond a proven pcb kit would be a move in the wrong direction.

And a solid basic approach provides a good platform for the future, something to compare against at least.
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Last edited by Bigun; 9th December 2013 at 08:47 PM.
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Old 11th December 2013, 03:11 AM   #13
djoffe is offline djoffe  United States
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I think this may be exactly what you're looking for...It's a complete kit, with a great manual, and you guys should have a lot of fun building it.

Akitika GT-101 Audio Power Amplifier Kit
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Old 16th December 2013, 08:54 PM   #14
troystg is offline troystg  United States
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Originally Posted by sesebe View Post
Hi,

My suggestion is to go a hibrid one with some from LME498xx familly.
With 12" driver you can go deep in bass region and a LM3886 based design can quickly reach the voltage excursion limit.
100% agree...
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Old 5th January 2014, 07:20 PM   #15
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Default Completed Amp

Hi Guys,

Thanks for all the advice. As I mentioned I went with one of Peter Daniel's excellent LM4780 kits! There was a little mistake with wiring up the secondaries to the rectifiers and it lead to some exploding MUR8100's (oops ) but i wound up finding some full wave rectifiers at radioshack (actually sourced from Vishay so not so bad) and got them all hooked up and spitting out some consistent pulsed DC without any ringing that I could hear at least.

We opted for parallel configuration even though they are driving 8 Ohm loads we didn't have a balanced source and it will be nice to have the option to try it out with some less efficient 4 ohmers .

Anywho here are some pics of the final project. The sound is fantastic!! Clear and wonderful imaging! I finished it on NYE and we spent the night listening to our favorites and hearing them in new light, wonderful stuff.

I just ordered another kit. I'm going to to do this one more correctly. Two transformers (correctly wired) to the MUR860's and then work in some circuitry to switch between parallel and bridged using a a DRV134 to handle the SE to balanced conversion. I'll keep you guys posted!
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Old 5th January 2014, 07:54 PM   #16
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Looks great - you went well uptown on the trafo so that will never be a bottleneck
Sounds like you had a great time and got the result you wanted. Those chipamps can really surprise.
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Old 5th January 2014, 08:15 PM   #17
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haha yeah, I know the correct option is 2 moderate transformers but I opted for 1 big 625VA mama for simplicity and cost's sake. Definitely gives the juice. And it seems like the LM4780's built in under-volt protection negates the need for soft start, no discernible clicks or pops on power up.

next build will probably sport 2 X 250VA's
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Old 8th January 2014, 05:59 PM   #18
AndrewT is online now AndrewT  Scotland
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The soft start has nothing to do with the circuit that follows the toroid transformer.

The soft start is a current limiting circuit that limits the start up current of the transformer BEFORE it sends decent current to the rectifier and what comes after that.
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Old 9th January 2014, 12:37 PM   #19
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Quote:
Originally Posted by vapemaster View Post
Two transformers (correctly wired) to the MUR860's and then work in some circuitry to switch between parallel and bridged using a a DRV134 to handle the SE to balanced conversion. I'll keep you guys posted!
The LM4780 Parallel amp is a good choice for some sturdy clarity and it can be bridged if you double the number of LM4780's. See also Link to AN-1192.PDF See also BPA200.
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