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Offline tamu

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ssr01 wrong output
« on: January 20, 2012, 08:41:42 PM »
Hi all, I finished building a ssr01 to power my gamma2 dac and its the 5v version. made sure I used all the parts specified in the bom.

I when I first turn the power on the DZ1 led briefly flashes and I get only 3.4v out which fluctuates a bit around 3.3 and 3.4v.

opamp pin 2 has .74 and pin 3 has .79
pin 7 is at 1.02v
my first suspect is q3 but I will check all the transistors just to be sure..

Any other ideas would be more than welcomed. :-)
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Offline peranders

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Re: ssr01 wrong output
« Reply #1 on: January 20, 2012, 11:02:03 PM »
How much is your input voltage? For 5 V out you must have at least 10 V in if you have the LM317 installed. Are the SENSE inputs connected? Which opamp du you use?
« Last Edit: January 20, 2012, 11:04:35 PM by peranders »
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Offline tamu

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Re: ssr01 wrong output
« Reply #2 on: January 21, 2012, 04:18:34 AM »
Ive got a 9v 15va trafo..

sense inputs are not used (j1 and j2 are soldered)

opamp is ad825
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Offline peranders

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Re: ssr01 wrong output
« Reply #3 on: January 21, 2012, 10:37:58 AM »
Have you used my BOM for 5 V?
If you measure your input voltage, how much is it?
R5 in place, not R6?
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Offline tamu

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Re: ssr01 wrong output
« Reply #4 on: January 21, 2012, 10:44:48 AM »
Yep used your bom.
Trafo is 11v unloaded
R5 is in place. No r6 resistor
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Offline peranders

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Re: ssr01 wrong output
« Reply #5 on: January 21, 2012, 02:12:03 PM »
The opamp is placed correctly?

If you remove the R5, does the collector voltage of Q1 increase?

DZ1 is a LED and placed correctly?
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Offline tamu

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Re: ssr01 wrong output
« Reply #6 on: January 21, 2012, 07:07:57 PM »

Quote from: peranders on January 21, 2012, 02:12:03 PM
The opamp is placed correctly?

If you remove the R5, does the collector voltage of Q1 increase?

DZ1 is a LED and placed correctly?

yes

I dont know I will check that later

and yes.
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Offline tamu

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Re: ssr01 wrong output
« Reply #7 on: January 24, 2012, 08:19:26 AM »
sorry for the late reply..

So I removed the r5 and on q1 collector pin I have 14.4 pin 2 has 1.4 pin 3 had 9.2v
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Offline peranders

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Re: ssr01 wrong output
« Reply #8 on: January 24, 2012, 01:19:04 PM »
It seems that the AD825 is broken. Is R5 really 47 ohms, not 470 ohms? Was the opamp placed correctly?
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Offline tamu

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Re: ssr01 wrong output
« Reply #9 on: January 24, 2012, 07:37:34 PM »
it could be.. Ill check what opamps I have and see if any is suitable.

I checked the resistor again and Im sure its 47ohms.
« Last Edit: January 24, 2012, 07:59:38 PM by tamu »
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Offline tamu

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Re: ssr01 wrong output
« Reply #10 on: January 25, 2012, 09:05:45 PM »
ordered a couple of ad825 opamps. will replace the one on the board and see what happens.

thanks for the help so far peranders. much appreciated.
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Offline tamu

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Re: ssr01 wrong output
« Reply #11 on: January 28, 2012, 11:12:33 PM »
swopped the opamps and still no change..
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Offline peranders

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Re: ssr01 wrong output
« Reply #12 on: January 28, 2012, 11:37:49 PM »
Have you used my BOM to 100% or are some parts changed?
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Offline tamu

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Re: ssr01 wrong output
« Reply #13 on: January 29, 2012, 05:57:03 AM »
the only thing different is bc556 transistors.
I couldnt find the "c" version so I got the "b" ones.
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Offline peranders

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Re: ssr01 wrong output
« Reply #14 on: January 29, 2012, 09:51:20 AM »
The B, C thing should be a problem. Could you send me a couple of close up pictures?
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