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
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
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
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
A 60-0-60V transformer will be ±85V DC after the rectifier and filter caps. This would be about 300W/8R
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
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
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/~athsam/power_amp_300w.htm
That amp is also bridgeable (up to 800 W / 8 ohm), PCB eagle layout is available...
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/~athsam/power_amp_300w.htm
That amp is also bridgeable (up to 800 W / 8 ohm), PCB eagle layout is available...
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
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
For a very easy subwoofer amp let us examine the grounded output stage:
http://www.mif.pg.gda.pl/homepages/tom/files/usa1310.gif
Done with MOSFET outputs (you need a TIFF viewer, click on images):
http://164.195.100.11/netacgi/nph-P...0&s1=4467288.WKU.&OS=PN/4467288&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.
http://www.mif.pg.gda.pl/homepages/tom/files/usa1310.gif
Done with MOSFET outputs (you need a TIFF viewer, click on images):
http://164.195.100.11/netacgi/nph-P...0&s1=4467288.WKU.&OS=PN/4467288&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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