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Old 31st January 2003, 09:06 AM   #1
SlaitH is offline SlaitH  Sweden
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Default Advise on Diy Subwoofer amp

Hey

I'm looking for a suitable amp to power my upcoming subwoofer project.
I'm building the Linkwitzlab "THOR " model. I have made my own PCB for the eq circuit. Because it seems like a nice alternative to building with slave or ported.

Now I would like you're advice in building an affordable amp for this project.
I have an 60-0-60~ 600VA transformer at home. At least I think it's 60-60 around there anyway

I looked at aussie amps and some other projects, but for those money I can buy a Hypex amp. And that's not in my budget. (Making other stuff for my PJ also)

Got any ideas??

Thanks guys & gals.

Ps. I just found my way to this forum, and i'm hooked already ds.

Patrik
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Old 31st January 2003, 09:49 AM   #2
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Hi!

Try ESPs Project 68, a 300 W Sub amp, with PCBs available. It is ideal for direct mounting into the subwoofer enclosure (if you bolt the PCB(s) directly to the heatsink), and should not cost that much

http://sound.westhost.com/project68.htm

I will definitely give it a try some time this year...

Bye,

Arndt
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Old 31st January 2003, 10:20 AM   #3
djk is offline djk
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A 60-0-60V transformer will be 85V DC after the rectifier and filter caps. This would be about 300W/8R
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Old 31st January 2003, 11:59 AM   #4
SlaitH is offline SlaitH  Sweden
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djk: Yepp that would be what i'm looking for.

I've looked at the project 68 and it's a little under what I think I need in 8ohms. I already have the Amp PA 300 that was in elektor magazine a couple of years ago. But it's a little on the low side.
Okay it's mainly gonna be for music and HT work. So maybe around 300W 8ohms would over the top. But I want solid grip on the voicecoil and don't feel it's gonna be there with a lesser amp. And the transformer and capacitor will be as much as I can fit.

Got any thoughts??

Patrik
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Old 31st January 2003, 03:57 PM   #5
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You could also use a pre-made module like the Accusound 100 from Thel

http://www.thel-audioworld.de/module/acuso/acuso.htm

It can stand up to 95 V, with a 60 V transformer it will deliver 370 W into 8 Ohms, and with a second (very small) Transformer for the driver transistor rails up to 430 W / 8 Ohm...
It costs 222 (~ 240 $) (plus heatsink, plus rectifier, plus PSU caps, but those you will always need, and big caps that can stand 85 V after rectifying don't come cheap...)

But then maybe again this is too expensive, but big power with high end = big money...

Also take a look at

http://users.otenet.gr/%7Eathsam/power_amp_300w.htm

That amp is also bridgeable (up to 800 W / 8 ohm), PCB eagle layout is available...
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Old 1st February 2003, 04:21 PM   #6
SlaitH is offline SlaitH  Sweden
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The thel thing looks nice. I'm not really in to the prefab thing. I would preffer to make it myself. Besides i've got ways to get parts easy too.

And the later amp is double sided. At work I can only make single sided boards!! Too bad.

Any other suggestion. Maybe for somewhere in the 85 +- volt region

I'm really in the mood for building, thougt about the titan. But it's not what I need for a sub. seems like making a fire for the crowes.
I saw an amp in elektor back from 86 or something it was 500w 4ohms really long board thoe. At leas 30 cm so the whole thing did not fit in the magazine.

Keep 'em comin

Patrik
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Old 3rd February 2003, 01:41 AM   #7
djk is offline djk
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For a very easy subwoofer amp let us examine the grounded output stage:

http://www.mif.pg.gda.pl/homepages/t...es/usa1310.gif

Done with MOSFET outputs (you need a TIFF viewer, click on images):

http://164.195.100.11/netacgi/nph-Pa...&RS=PN/4467288

The QSC uses 8 pair for 1KW/2R from 93V, for 300W/8R from 85V three pair will be more than adequate.

How much of this circuit do we actually need?

IC1, the bias diodes D5 and D6, R14 and R15 (change to 3.3K), TR1 (bias pot), Q1 and Q2 (drivers), R16,17,12,13, C6,5, the gain setting feedback network, the output zobel. Enough emitter resistors for however many outputs you plan to use. Adjust the bias to 340mV across R16, this gives about 15mA though the drivers at idle. The op-amp is to be powered by its own 15V supply that will also be used for the crossover filters, etc.

Note that the cases of the output transistors are grounded, no insulators needed.
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Old 3rd February 2003, 08:53 AM   #8
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have a look at this thread:

link

didn't build it yet, but got the schematic and pcb layout from someone who did....

best regards,

HB.
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