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Hi!

Welcome to my DIY audio forum. The forum SW has been reset and unfortunately there were some problems with backup files so a few posts were lost, nothing important though.

Cheers
Per-Anders Sjöström

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#41
Power supplies / Re: SSR03 (AD825, LM431, +-15V...
Last post by minionas - March 12, 2020, 09:33:58 PM
AC input is ~21.4V.
Load is ~3-400ma per side.
#42
Power supplies / Re: SSR03 (AD825, LM431, +-15V...
Last post by peranders - March 12, 2020, 09:30:21 PM
How high is your input AC voltage? How much do you load with? Current?
#43
Power supplies / Re: SSR03 (AD825, LM431, +-15V...
Last post by minionas - March 12, 2020, 09:16:21 PM
Lm317 has 24.5V at input and Lm337 has only 17.9V..
#44
Power supplies / Re: SSR03 (AD825, LM431, +-15V...
Last post by peranders - March 12, 2020, 08:57:12 PM
The AC voltage should be a few uV but this must be measured with special equipment. Check first the incoming voltage. It should be at least 4 volt more than the output voltage, in your case 19 volts. Measure at the input of the LM317/337.
#45
Power supplies / SSR03 (AD825, LM431, +-15V BOM...
Last post by minionas - March 12, 2020, 07:41:09 PM
Got transformers and hooked it up to SSR03 (AD825, LM431, +-15V BOM). Final result +15.19V / -15.09V. If i would like to trim it down a bit, to 15V exactly, what needs to be done?

I measure 10-11mV of AC on outputs on cold, and 9mV on stable working unit. It is normal in my case?

Thanks in advance.


#46
Power supplies / Re: Changing output voltage on...
Last post by peranders - February 04, 2020, 05:51:52 PM
If you check the documentation you can find the 6 V version, both BOM and schematics.
#47
Power supplies / Changing output voltage on SSR...
Last post by zidor28 - February 04, 2020, 02:45:51 PM
Am sure (and sorry if) this question has been dealt with before. I would like to change the output voltage of the SSR01 from 12V to 6V. I would just want to validate which resistor(s) needs to be changed and what kind of values would work. Thanks for this.
#48
Headphone amplifiers / Re: QRV-08 gain reduction
Last post by peranders - September 12, 2019, 07:30:03 AM
No...
#49
Headphone amplifiers / Re: QRV-08 gain reduction
Last post by Hodgin - September 11, 2019, 03:42:45 PM
Do 330 ohms impact anything else besides the gain?
#50
Power supplies / Re: SSR03-15V LM431 Volt too l...
Last post by eloes51 - September 08, 2019, 05:16:26 PM
Hi,

Thanks for the tip.

I did not think that the AGND have no mass !!!
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