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Old 19th December 2012, 03:34 AM   #11
DougL is offline DougL  United States
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I was looking for a SPMS for my B1, and found the one I chose had limits on capacitance on the output.
I would read the manual carefully for turn on limitations.

HTH

Doug
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Old 19th December 2012, 04:48 AM   #12
JZatopa is offline JZatopa  United States
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Doug thanks for the heads up. I couldn't find any specs so I put a post on the Connexelectronic area of the forum.
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Old 19th December 2012, 05:03 PM   #13
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A simple zener type shunt regulated supply or a capacitance multiplier is more "Zen" than either a switched capacitor supply or a supply with negative feedback. Why?

Because although the simple designs may need huge capacitors to bring the ripple down, with A class amps, the AC load current varies linearly with the audio signal and the full wave audio signal super-imposed on the PSU output has no effect on amplifier distortion.

My choice would be to replace the transformer and use a capacitance multiplier. You should be able to achieve <5mV ripple.
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Old 19th December 2012, 05:34 PM   #14
JZatopa is offline JZatopa  United States
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Could someone tell me the maximum ripple the zen circuit can handle. I know that I could just build a linear PS and get a nice low number but I think I want to try this SMPS and share my findings. I am worried that 200mV is going to be to much. If you could explain the math that determines this, I would be even more grateful
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Old 19th December 2012, 08:21 PM   #15
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200mV could be way too much. Which version of Zen are we talking about?
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Old 19th December 2012, 08:46 PM   #16
JZatopa is offline JZatopa  United States
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V1, I know that designs with ccs have higher psrr but I am not sure how much that matters in this situation.
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Old 19th February 2013, 09:27 PM   #17
JZatopa is offline JZatopa  United States
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So I finally got my SMPS in today. I am going to first see if the smps is ok by itself but I may try adding a CL filter after the smps to reduce any noise/harmonics. The SMPS can handle 15000uf on it's outputs and I would be using 2 10,000uf in parallel if I go this route. I'll keep things updated as I go along.
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Old 19th February 2013, 10:10 PM   #18
JZatopa is offline JZatopa  United States
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well one channel works but something let out the smoke on the other. I have found that smps are quick to let you know if there is something is wrong by pushing a lot of current through any small problem.

I am going to have to figure out what could have fried and fix it.
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Old 19th February 2013, 11:45 PM   #19
JZatopa is offline JZatopa  United States
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Well now both channels are broken. I think I am going to take a break today.

I replaced the 9140 with a 9240 I had on hand. It blew as well so I am guessing I have a problem somewhere else. I am guessing that I have a problem with the 140 or the MPSA92 but I am not 100 percent sure. I guess I will have to pull the board out and test both. Considering I was able to play this amp with a linear supply, what could be causing me to blow out components with the SMPS? The SMPS has a higher V+ then what the circuit calls for originally but later zen versions used higher V+ power supplies so I am not sure that is the problem. This link seems to say I should be ok as well. Could the higher V be pushing the I through MPSA92 past it's 500mA limit? Would switching the a ZTX550 improve things?



One side questions. With the SMPS, could I remove the 2 10,000uf caps on the board and still be ok? Are these guys doing anything besides ripple filtering?
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