Soundstrean Rubicon Class A 5.2 strange Power-On - Page 2 - diyAudio
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Old 28th January 2012, 04:36 PM   #11
azvrt is offline azvrt  Netherlands
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I don't have a bigger PS, I do have a fully charged large battery but I wouldn't be able to read the current draw.

Again, I have hooked up all kinds of amps to this power supply, including most of the amps Soundstream made in that era, including the almost identical but larger 10.2, and never experienced this.
It would therefore truly amaze me if the PS is causing this.
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Old 29th January 2012, 10:52 AM   #12
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Power it up with the power supply and measure the DC voltage on the pins of the 3524. Find the ones that are pulsing when the amp is trying to power up.

Power it up on the battery and perform the same tests. Do you see pulsing on the same pins of the 3524?
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Old 23rd February 2012, 09:26 PM   #13
azvrt is offline azvrt  Netherlands
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I forgot we have a certain digital multimeter with which one can read current draw, by wiring it in series with the power wires going to the amplifier.
So we checked whether the amplifier acted the same on our power supply as on our fully charged battery, and it did. Definitely not the power supply, definitely something wrong with the amplifier.

During startup, we found irregular voltage on pins 2, 9, 11, 14 and 15. Accroding to my father, pins 12 and 13 are on the same circuit as pin 15 so it should be the same there.

We measured with the oscilloscope, so numberaren't as accurate as with the DMM:
pin1 2.6 V
pin2 2.1 V irregular voltage at first
pin3 3.2 V but it was not typical DC, not AC either though
pin4 0 V according to my father, I didn't see though
pin5 same as pin4
pin6 3 V
pin7 3 V but it was not typical DC, not AC either though, and it had some DC offset.
pin8 same as pin4 and 5
pin9 3 V irregular voltage at first
pin10 not in use
pin11 14V irregular volateg at first, and I think it also had neither typical DC nor AC
pin12 should be the same as 15 according to my father
pin13 same as 13 and 15 according to my father
pin14 14 V irregular voltage at first and I think it also had neither typical DC nor AC
pin15 16 V (not 15V ?! though didn't check with DMM so not accurate) irregular voltage at first
pin16 4.9 V
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Old 23rd February 2012, 11:09 PM   #14
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It appears that the B+ voltage is simply dipping as the amp tries to power up.
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Old 23rd February 2012, 11:14 PM   #15
azvrt is offline azvrt  Netherlands
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Does B+ stand for battery + ?
Any guess as what could cause this ? Do I need to do something about it ?
We checked here and there, using the schematics, but we have no clue.

Remember that 10.2 with the extremely long turn-on the delay ? Still in my car, still no problems, while we did not repair it I believe. Strange.

Got another 10.2 with very strange behaviour, haven't had the guts to look at that one yet, an older thread of mine. That amp scares me, I am always afraid of powering it up to do some measurements as I am afraid its behaviour might be damaging to itself, which might be totally stupid...
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Old 24th February 2012, 06:35 PM   #16
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Does B+ stand for battery + ?

**** Yes. The voltage across the positive and ground terminals.

Any guess as what could cause this ?

**** The battery voltage depends on the current draw. When the amp powers up, there is a surge of current that causes the voltage to drop a bit.

Do I need to do something about it ?

**** There isn't anything you can do about it. All amps will cause this to happen to some degree.
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Old 24th February 2012, 06:41 PM   #17
azvrt is offline azvrt  Netherlands
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That's that, then.
I'll just re-assemble it, polish it and put it in my car and put it to good use.
I'll get the 10.2 out of there and put it for sale, gonna keep the 5.2 as I've got 2 spare boards from Jaime, for this amp.

Haven't seen an amp do this, though. Must be some kind of repairable malfunction, no ?
I was thinking of replacing the SG3524 chip a couple of weeks ago, but it could be so many different things causing this. Maybe a capacitor ?
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Old 24th February 2012, 06:46 PM   #18
azvrt is offline azvrt  Netherlands
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Ah, before putting that 10.2 for sale I'll use it to do comparative measurements with that malfunctioning 10.2 I have, might help to find the problem easier.
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Old 24th February 2012, 07:17 PM   #19
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You need to invest in a good power supply with regulated voltage. That would eliminate problems like this. Look for a supply rated for at least 30 amps. The pyramid PS52k is a good choice if you're on a tight budget.
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Old 24th February 2012, 07:22 PM   #20
azvrt is offline azvrt  Netherlands
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I have purchased nice switching power supplies last week. They are 13.8 V 25A continuous fan cooled.

But I think there is something wrong with this particular amplifier to cause this strange behaviour, I mean no other amp I have has ever done this, not even the very similar 10.2

Hmm, I could unpack one of the 5.2 boards I purchased from Jaime and power it up, then we'll know whether this is normal behaviour for this particular model or not. I would be surprised if another board shows the same behaviour. Only one way to find out.

I'll let you know what happens when I power on one of the two other 5.2 boards I have.
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