diy audio

[Trustmeimadoctor]

i quite fancy building an amp i see that ones based around the tpa3116d2 chips seem to get very good reviews BUT as with everything out of china there are clones then there are clones of clones and then there are just fakes

anyone know of a good source for good stock of pre-built boards?

also what else id need to make it work

[Adrian W]

Farnel, RS, Mouser, Digikey

[Monty Python]

Velleman

http://www.velleman.co.uk/contents/en-uk/d21_Ampli...

[TonyRPH]

Trustmeimadoctor said:

<snip>
anyone know of a good source for good stock of pre-built boards?

also what else id need to make it work

You don't give any indication of your level of skill.

In addition to boards / modules, you will need a transformer, bridge rectifier (or rectifier diodes - but bridge is easier), smoothing capacitors and a volume control potentiometer. And of course some kind of chassis to house it all.

There is nothing wrong with the majority of the Chinese modules on Ebay - they are mostly designed around 'reference' circuits (e.g. manufacturers datasheets).

The chip you are looking at is a class d, but you can also get the LMxxxx designs ( LM3886, LM4780)

I assume you have an understanding of mains wiring (important) and how to wire up power supplies (can let loose a lot of smoke if you get it wrong)...

[Watchman]

I'm building a Quad 405 clone at the moment. I bought the boards pre-assembled but there are home-assembly ones available for a couple of quid less.

You can buy everything to build one, including the case. I have a pair of boards, a transformer, PSU board, the case, wiring, connectors and just about everything for a winter project.

The Chinese cloned an earlier version of the 405, and there are a number of tweaks you can make to it now. I thought I'd build this one "as is" then maybe have a go at printing my own board to include all the subsequent updates. The beauty of the Chinese kit is that you get the T-shaped heatsink extrusions already milled to accept the T03 transistors.

I joined the DIYAudio forum - there are a lot of very talented people on there. I had intentions of building a pair of active Roger LS5/8 speakers to go with a pair of Quad 405s but the quality of their work has left me feeling rather inadequate.

Anyway, the kit I've got so far:



I have the case too - I just haven't photographed it.

[Trustmeimadoctor]

i have no skill with electronics really but want to learn was thinking first pre built board and solder rca's and pot etc and then see how it goes then maybe build from bare board with through hole stuff im too shakey for smd's i think

[Trustmeimadoctor]

i liked the look of this kit from yuan jing audio

http://www.yuan-jing.com/DIY-Kits/diy-kit-tpa3116-...

[Watchman]

What sort of grunt does that poke out?

Going back out a page (follow the breadcrumb) suggests 50W + 50W. I'd be surprised if that was the case - the PSU doesn't look like it'd support 100W so that will likely be the peak output.

[TonyRPH]

The specs are listed further down the page.

Power Efficiency: > 90%
Quiescent Supply Current: 50mA
Freq. Response: 20Hz ~ 20KHz
Rated Output Power: 2 x 50W @ 4 Ohm

From the Ti spec sheet:

2 × 50 W Into a 4-Ω BTL Load at 21 V
(TPA3116D2)

OP, personally, I wouldn't bother with one of these.

I would for an LM3886 or similar - it will yield a far better quality amplifier.

[Trustmeimadoctor]

Watchman said:

What sort of grunt does that poke out?

Going back out a page (follow the breadcrumb) suggests 50W + 50W. I'd be surprised if that was the case - the PSU doesn't look like it'd support 100W so that will likely be the peak output.

50W BTL
100W PBTL
4.5v-26v
obviously its not going to do that at 4.5v into 8ohm but it will do 2x50 at 21v with a 4ohm load

[TonyRPH]

Whilst we're sharing pics, this is my most recent effort.

A couple of modules off Ebay, two transformers liberated from a couple of scrap Cambridge A5 amplifiers, and a Rotel power amp used for the chassis.