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Old 22nd January 2013, 02:56 PM   #1231
miepa is offline miepa  Austria
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thanks Frans. hope you would say so.
FP was my first choice.
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Old 22nd January 2013, 03:36 PM   #1232
RCruz is offline RCruz  Switzerland
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Did you check your caps voltage rating ?
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Originally Posted by Libby123 View Post
no, as I would saying. I pulled out the plug as I saw the "liquid".
What is the voltage rating of the caps that blew ?

What caps are you using ? (Capacity uF Voltage rating V) it is written in the caps body.

You stated you used different caps because of the footpint...
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Old 22nd January 2013, 03:51 PM   #1233
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What is the voltage rating of the caps that blew ?

What caps are you using ? (Capacity uF Voltage rating V) it is written in the caps body.

You stated you used different caps because of the footpint...
I thougth it were the 6800 from GB that have the worng foot spacing, but it was the 4700 Caps that were wrong. So the "wet-ies" are the ones from GB = 6800/6,3V
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Old 22nd January 2013, 04:14 PM   #1234
RCruz is offline RCruz  Switzerland
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We need some voltage measurements.

I would visualy check all parts, remove the caps, power on and measure voltages on the empty locations of those caps.
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Old 22nd January 2013, 08:24 PM   #1235
quan is offline quan  Australia
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yes exactly
Hi Alfred, change input loading to 22K and no changes in servo offset ie +5V so look like i will leave it at that. I will try to find the appropriate material for the faraday cages and re-do the groundings. Thank you so much. BTW is the picture in the build guide is your R3 ? How do you implement input loading switch if you don't mind me asking?
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Old 22nd January 2013, 08:42 PM   #1236
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Originally Posted by RCruz View Post
We need some voltage measurements.

I would visualy check all parts, remove the caps, power on and measure voltages on the empty locations of those caps.
So, I take some measurements:

First of all the power supply is +24,96V and -25,09V. OK or Not OK?

The board with the 2x 6800/10V at V+ broken
VCASCH: 14,4V
VCASCL: -14,4V
V+: +18,00V (trimmed)
V-: -18,00V (trimmed)
V- 4700uF -14,4V
V- 6800uF -5,6V
V+ 4700uF +14,4
V+ 6800uF -4V !!!!!!!!!!!!!!

I think thats it. But why?
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Old 22nd January 2013, 08:43 PM   #1237
FdW is offline FdW  Netherlands
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First of all the power supply is +24,96V and -25,09V. OK or Not OK?
Totaly o.k.!
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Old 22nd January 2013, 08:44 PM   #1238
FdW is offline FdW  Netherlands
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Originally Posted by Libby123 View Post
V+: +18,00V (trimmed)
V-: -18,00V (trimmed)
O.k. to 4 decimals
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Old 23rd January 2013, 09:36 AM   #1239
hesener is offline hesener  Germany
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Originally Posted by quan View Post
Hi Alfred, change input loading to 22K and no changes in servo offset ie +5V so look like i will leave it at that. I will try to find the appropriate material for the faraday cages and re-do the groundings. Thank you so much. BTW is the picture in the build guide is your R3 ? How do you implement input loading switch if you don't mind me asking?
Quan
Hi quan,
thanks for the update, thats ok then. Yes that is my R2 build, working as advertised (in fact I had a great evening yesterday, listening to the Cowboy Junkies).
The input resistances in my case are Dale RN65 resistors (stepped 10 / 50 / 100 / 220 / 470 / 1000 Ohm) through a rotaty switch (C&K, with silver contacts). works just fine.....
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Old 23rd January 2013, 09:47 AM   #1240
quan is offline quan  Australia
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Originally Posted by hesener View Post
Hi quan,
thanks for the update, thats ok then. Yes that is my R2 build, working as advertised (in fact I had a great evening yesterday, listening to the Cowboy Junkies).
The input resistances in my case are Dale RN65 resistors (stepped 10 / 50 / 100 / 220 / 470 / 1000 Ohm) through a rotaty switch (C&K, with silver contacts). works just fine.....
Thanks Alfred, can you post a picture how it is implemented if it is not too much trouble?
Quan
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