diyAudio (
-   Chip Amps (
-   -   NOOB! Thinking of building a 4 ch 3875 amp - questions.. (

quickshift 2nd August 2005 05:36 PM

NOOB! Thinking of building a 4 ch 3875 amp - questions..

Just a bit of background. My electronics knowledge is limited to having built passive crossovers and replacing frazzled components so forgive me if these are really silly questions please.

I want to build a 4 ch amp to drive a set of bi-wireable speakers I'm building (8 Ohm or thereabouts) so the 3875 kit from looks like a good bet because all I have to do is soldering and case it up which I won't have a problem with.

I want to use 2 dual mono kits with 2 seperate transformers in a 2U 19" rackmount case.

My questions are...

Can I use a single set of inputs and connect them to the imputs of both amp kits or do I have to have 2 sets of inputs?

If I do have to have 2 sets of inputs, is there anywhere that does a pre-amp kit with dual pre-outs? Just a basic one with 5 inputs and no phono stage will be fine.

Sorry again if thse are really silly questions.

quickshift 3rd August 2005 11:51 AM

Sorted now.

I have found a preamp with dual pre-outs. :)

Dazza 5th August 2005 07:56 AM

Hey Quickie,
I have done exactly what you are planning. You can check out mine in these forums. There is some good pics which should inspire you.
Or Click here


Dazza :D

quickshift 5th August 2005 08:22 AM

Hiya D,


Nice job :)

That looks fab.

That's a lot more complex than what I was planning, I like the idea of adding speaker protection - it there a kit speaker protection module kit available? If I tried to build one from a diagram it would probably end up receiving radio 1 or something instead ;)

Nice, Q

Dazza 6th August 2005 06:06 AM

Hey Q,
Glad u liked my amp. If you visit here you will find a speaker protection kit, actually you should be able to find plenty to suit your needs. As the site is here in Australia, the postage might be a bit expensive with the exchange rate and such.
Might be worth looking into, see how ya go.



quickshift 7th August 2005 08:58 AM

Thanks D,

In have had a search around and come up with this.

If seems to offer protection against various things and also soft start so it seems ideal. Lets hope it sounds OK. :)

Managed to resist the urge to buy LED VU meters too :D

Cheers, Q

Nuuk 7th August 2005 01:08 PM

Quickshift, if you have any more questions, you may find them answered on the Gainclone pages at Decibel Dungeon! ;)

quickshift 7th August 2005 01:57 PM

Cheers Nuuk,

I have looked at that site and a few others over the last few weeks, I didn't really understand much of them though :D

I promise I have tried to answer my questions myself, like I say, I'm new to all this I'm afraid.

Anyway, I think I have all the info I need to lob something together now albeit merely assembled from kits. :)

All times are GMT. The time now is 03:56 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 18.75%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio