Projects > Power supplies

SSR-03 gives too low voltage on -Uout

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Maikel:
Hi Per Anders,

I just powered up my SSR03. Its the 9V edition, but when I measure without or with a load -Uout doesn't give the correct voltage.
This is what I measure unloaded: -Uout:-4,89=    +Uout:+9,09=
Loaded with 1k ohm resistor: -Uout:-4,81=    +Uout:+9,09=
When I turn off power the led on de -Uout stays on around 3 seconds longer than the led on +Uout

I made a mistake when connecting the (AC2) the first time because I connected the phase on ground, and ground on phase. Because it's AC that shouldn't make a difference? Or could it be that I damaged something?
I measure the same values now when connected in the correct way.

I also measured AC1 and AC2 inputs and they are both 14,68V~
I also measured X2 (right after the C's): -U to gnd:-18,72=    +U to gnd:18,52=

The cooling block don't get warm.

Could you give me some guidance please?

peranders:
have you shorted the J1-4 with a tin drop?

The positive half seems to work.

Can you measure the voltage on the opamps?

N1, pin 2, 3, 6 and 7

N3, pin 2, 3, 4 and 6

Maikel:

--- Quote from: peranders on February 17, 2018, 11:19:18 AM ---have you shorted the J1-4 with a tin drop?
--- End quote ---
I think I did, will check tomorrow

--- Quote ---The positive half seems to work.

Can you measure the voltage on the opamps?

N1, pin 2, 3, 6 and 7

N3, pin 2, 3, 4 and 6

--- End quote ---
I will measure tomorrow, will let you know.

Maikel:

--- Quote from: peranders on February 17, 2018, 11:19:18 AM ---have you shorted the J1-4 with a tin drop?
--- End quote ---
Yes I have. I measure shorts (0 ohm)between X5 and +Uout and X7 to ground
For the negative half shorts (0 ohm) between X4 to -Uout and X6 to ground

--- Quote ---The positive half seems to work.
--- End quote ---
Yes that seems the case

--- Quote ---Can you measure the voltage on the opamps?

N1, pin 2, 3, 6 and 7
--- End quote ---
Pin 2: 4,54V
Pin 3: 4,54V
Pin 6: 5,51V
Pin 7: 8,81V

Pin 2: -2,43V
Pin 3: -2,94V
Pin 6: -3,88V
Pin 7: 0V

--- Quote ---N3, pin 2, 3, 4 and 6
--- End quote ---
I don't use DIL, but I have the AD825ARZ smd IC's soldered by you on my board

Just studied the schematic and looked in the photo of negative half on your website and I soldered the diode zener DZ2 in the wrong direction. I will correct that right now and measure again

Maikel:
+Uout still gives me 9,09V
-Uout gives me 9,21V

Is there an option to get -Uout also at -9,09V ?
Can I just add an P4 trim pot or do I have to change anything? What value can I best use for this?