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Old 23rd April 2018, 08:10 AM   #181
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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Group buy: SSR03 Super Regulator Power Supply Board
If you look at the pictures at post 167 and 179, there you have the answer. The outline of the part is not maybe optimal in clearness but since you both have schematics, pcb layout and on top of that a double sided board it's possible to figure out the correct placement.

If you look in the schematics you'll see that the LED is twisted 180 degrees compared to the normal zener diode. I use the LED as a 1.6 V zener.
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Old 23rd April 2018, 12:07 PM   #182
fred sonnen is offline fred sonnen  Germany
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THANK YOU!
Now I get +-5V
It was the DZx LED.

plugged 10ohm / 10W load restisors to emulat 500mA@5V
I measure 3,26V instead of 5V
During the load test the DZx LED didn't show any light

Quote:
Originally Posted by peranders View Post
The current limitation must be set to cover your needs. R47 and R48 must be tuned. 0.65/I = R
In general: To use a second resistor at R47+48 I can use the R49+50 pads?

Last edited by fred sonnen; 23rd April 2018 at 12:11 PM.
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Old 23rd April 2018, 02:17 PM   #183
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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Good that it works. You can use the extra holes to tweak the shunt resistance.
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Old 23rd April 2018, 07:09 PM   #184
fred sonnen is offline fred sonnen  Germany
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Quote:
Originally Posted by peranders View Post
The current limitation must be set to cover your needs. R47 and R48 must be tuned. 0.65/I = R

350 mA = 1.8 ohm

If you solder 12 ohms in parallel, then you will have 1.8 ohms. You can remove the 2.2 ohm and replace it with 1.8 ohm but the risk is that you will damage the pcb.
According to the formular I have to use:
1,3ohm for 500mA@5V
1,625ohm for 400mA@17V
2,6Ohm for 250mA@15V; this is fine with the orig. configuration of 2,2ohm.

you mean 12 ohm parallel to the existing 2,2 ohm ;-)
then R49+50:
3,3ohm to get 490mA@5V
6,8ohm to get 390mA@17V
right?

Last edited by fred sonnen; 23rd April 2018 at 07:32 PM.
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Old 24th April 2018, 04:58 AM   #185
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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You should use the law of parallel connection. Easy to find on the net if you don't know it by heart.

A = the shunt you have
B= resistor to add
C= wanted total resistance

B = 1/((1/C)-(1/A))

or

B= (A*C)/(A-C)
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SSR03 group buy. Sign up for interest HERE. 14 pcb's in order. 0 paid.

Last edited by peranders; 24th April 2018 at 05:03 AM.
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Old 24th April 2018, 05:17 AM   #186
fred sonnen is offline fred sonnen  Germany
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I used this page
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Old 24th April 2018, 03:56 PM   #187
fred sonnen is offline fred sonnen  Germany
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66% is done
I soldered 6,8ohm resistors at R49+50 paralell to the existing 2,2ohm at R47+48
both 17V-SSR03 measured 2x 17V with installed load resistors ;-)

the 5V SSR03 seams to be more complicate..
I soldered 3,3ohm resistors at R49+50 paralell to the existing 2,2ohm at R47+48
the results at X3 are -3,76V +3,9V with installed 10ohm/ 10W load resistors
During the load test all LED just flashes a short time
the results at X3 are +-5V without installed load resistors
During this test all LED are on

Last edited by fred sonnen; 24th April 2018 at 04:02 PM.
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Old 24th April 2018, 04:44 PM   #188
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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You must always have 10 V in at the LM317/337 input. Do you have that?
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Old 24th April 2018, 07:48 PM   #189
fred sonnen is offline fred sonnen  Germany
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317, plan view, from right to left, without installed load resistors
11,32
7,57
6,33

337, plan view, from right to left,without installed load resistors
7,29
11,28
6,04

Last edited by fred sonnen; 24th April 2018 at 07:52 PM.
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Old 25th April 2018, 04:12 AM   #190
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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I'm interested with load. Without load you have a correct function as you have noticed. The task now is to determine why you have the voltage drop.
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