Generally SMPS's output current limiter prevents start-up sequence at short circuit or high output capacitance, since charging current easily exceeds few tens of amperes. SMPS1200A400 power-on output characteristic is pure square wave function, so it looks that overcurrent protection has inherent time delay allowing output current to settle to normal level within one second, thus enabling high output capacitance. That makes Hypex SMPS even more suitable for audio use compared to other producers, preferred choice for audio power amplifier.
That's OK Ck, even better solution. 
But for me opening the hood, not removing anything, it was a simple & quick fix. 🙂
CapBank modules in pics below is probably most elegant variant of them all. 😉
I see WBT and Hypex too. How are you pleased with the sound? Other parts of the system?
But for me opening the hood, not removing anything, it was a simple & quick fix. 🙂
CapBank modules in pics below is probably most elegant variant of them all. 😉
I see WBT and Hypex too. How are you pleased with the sound? Other parts of the system?
Attachments
I was using Teddy Prado 100w mono before this amp driving a pair of Genesis IM8300. Never hear the speaker sing so well before for the past 10 yrs.
Nothing really problem except the amp need few seconds to discharge after power down with some funny sound from the speaker and also after adding cap I encounter 2-3 times one channel not powering up when turning on the amp. I suspect the startup current too high and cause one of the psu shutting down. Randomly happen on either side. But a power down and up always works. Maybe my fault of shutting down too fast when changing cables or preamp. Not sure. Just know it's sounds great.
My friend came my office heard my amp ask me to diy one for him also. Another friend studying to make one too. I have reserved 2 FO M module previously please add 2 more FO M to my order. Also waiting for your dual mono chassis and FO L module also. Great job.
Cheers
Ck
Nothing really problem except the amp need few seconds to discharge after power down with some funny sound from the speaker and also after adding cap I encounter 2-3 times one channel not powering up when turning on the amp. I suspect the startup current too high and cause one of the psu shutting down. Randomly happen on either side. But a power down and up always works. Maybe my fault of shutting down too fast when changing cables or preamp. Not sure. Just know it's sounds great.
My friend came my office heard my amp ask me to diy one for him also. Another friend studying to make one too. I have reserved 2 FO M module previously please add 2 more FO M to my order. Also waiting for your dual mono chassis and FO L module also. Great job.
Cheers
Ck
Not to pollute this thread but here's the finished ATS-4 speakers. My friend Royber and I both made an identical pair.
Troels Gravesen ATS-4!
Do
Troels Gravesen ATS-4!
Do
Do,
What fantastic DIY! My hats off to you, you are my DIY hero!
LC,
Are those cap module boards available for purchase with your FO boards?
Best,
Anand.
What fantastic DIY! My hats off to you, you are my DIY hero!
LC,
Are those cap module boards available for purchase with your FO boards?
Best,
Anand.
What a good solution!
Is this also possible with the V1.3? (not quite ready to build a V1.4)
R.
Mounting the electrolytic caps onto the heatsink does not seem ideal to me because the heat will affect the life time of the caps. And how long will the self adhesive thingy stick to the heatsink?
Measured 48 °C temp in closed chassis, all Mundorf caps on PCB and these extra added at exactly the same temperature. Also new ones are well isolated via plastic holder and they have specified life time of 3000 hours at 125 °C or 16000 hours at 85 °C, no worries here.
Producer of self adhesive holders specified them for 60 °C, we have to give opportunity to new technology and materials. Regular products will of course have Cap Bank PCB on each side of First One module. 😎
Yes of course, it mainly depends on power supply's output current capability, not power amp itself. 😉
That's good news, I am using the Hypex 1200A400. Could you tell me where I can hook up the extra caps on the V1.3?
R.
And then it became very silent, I don't want to be impatient but I really want to know!... OK I am a bit impatient since I the correct caps laying around..haha.
R.
It's not that hard... Between SMPS and amp. V+ to positive side of cap other side to ground. V- to negative side of cap other side to ground. I am sure you can find some examples somewhere on the internet
All versions are exactly the same when it comes to adding caps. You are just trying to put the new capacitors in parallel with the existing ones like this schematic.
If you take your modules off the heatsink you can just solder wires to the same points that the original Mundorf caps are soldered to. Copy the wiring scheme so that you make sure the negative and positive sides of the capacitors are connected the same as the original capacitors.
If you don't want to remove the boards from the heatsink then you will need to follow the pictures LC showed where you solder the wires to the power supply points on the top of the board. As Mark said on V+ line capacitor positive to V+, capacitor negative to ground. On V- side capacitor positive to ground and capacitor negative to V-. The same way as the schematic above shows.
