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Old 18th November 2014, 07:18 PM   #1
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Default Spartacus S-1000 Build Log

Hi all,

Time has come, finally, that the final design of my amp is materializing. While parts are still in development, I have pretty much settled on the mechanical build up and the power supplies that will feed the amplifier. This thread is intended as a build log and will be updated as more parts are finalized and be put together.

To start, I've had the bottom plate machined to spec, which is 4mm thick aluminum, along with the power ground plate and power rails for the output supply. Then we have auxilary components like rubber feet and stuff, the net filter and the bridge rectifier.

The amplifier output stage will be powered by two toroids of 850VA each (55-0-55, 7.5A per winding) and bufferd by a 80mF reservoir. The first picture shows all these components while the second shows the buffer capacitors in detail.

Currently, I'm still working on the PCB for the front-end supplies, which should be finished soon. After it is complete and put together, I can mount all of the supply parts to the bottom plate.

Updates are sure to follow, but it won't be every day; I'll take it easy on the build

For now, with pride, the parts!
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Old 18th November 2014, 09:12 PM   #2
Bensen is offline Bensen  Belgium
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Hi Magicbox,


I was hoping to see more of your Spartacus lateral mosfet amplifier, since you were referring to it in an other thread.


Regarding your PSU, if you want to go all the way; use hexfred rectifiers and two rectifiers bridges per xformer.

I also build a high performance PSU in a seperate case. When the PSU is switched off, the PSU will remain at +-6v to increase lifetime of the caps and to reduce peak currents when switching on.
High performance dual mono PSU
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Old 18th November 2014, 09:37 PM   #3
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Hi Bensen,

That is a very neat solution for your PSU! I certainly like the idea of this stand-by voltage for the caps. I'm affraid though I can't make too many changes to my supply set-up any more as most has been calculated for. At most I think a better performing bridge rectifier.

I specifically want to use a shared supply; one amp channel will receive its input in anti-phase (speaker connected in anti phase as well to revert back to zero phase), resulting in a symmetrical loading of the supply, which comes pretty close to being 2x mono in practice. It makes much better use of the transformers that way too.

The front-end supply however will indeed be a separated, dual mono setup and will be regulated on the amp channels in addition.
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Last edited by MagicBox; 18th November 2014 at 09:51 PM.
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Old 19th November 2014, 08:41 PM   #4
Bensen is offline Bensen  Belgium
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C'mon Magicbox,give us a sneak preview of the schematic!
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Old 20th November 2014, 05:55 AM   #5
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I'm sorry, but I have decided a long while ago I would not post the complete schematic any more. When the amp is done and realized and actually works as intended, this may change though. I have posted various threads in the past that may hint at key points of the schematic though, but these are far from this final design. This will be a build log, no more
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