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71
Power supplies / Re: SSR03 (AD825, LM431, +-15V BOM)
« Last post by peranders on March 13, 2020, 06:29:46 AM »
I suggest that you reduce the R9 and R10 to 1 ohm. You could also place a wire jumper there. Both LED's should lit also. That is a sigh that you will get a proper regulation.
72
Power supplies / Re: SSR03 (AD825, LM431, +-15V BOM)
« Last post by minionas on March 12, 2020, 09:33:58 PM »
AC input is ~21.4V.
Load is ~3-400ma per side.
73
Power supplies / Re: SSR03 (AD825, LM431, +-15V BOM)
« Last post by peranders on March 12, 2020, 09:30:21 PM »
How high is your input AC voltage? How much do you load with? Current?
74
Power supplies / Re: SSR03 (AD825, LM431, +-15V BOM)
« Last post by minionas on March 12, 2020, 09:16:21 PM »
Lm317 has 24.5V at input and Lm337 has only 17.9V..
75
Power supplies / Re: SSR03 (AD825, LM431, +-15V BOM)
« Last post by peranders on 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.
76
Power supplies / SSR03 (AD825, LM431, +-15V BOM)
« Last post by minionas on 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.


77
Power supplies / Re: Changing output voltage on SSR01
« Last post by peranders on February 04, 2020, 05:51:52 PM »
If you check the documentation you can find the 6 V version, both BOM and schematics.
78
Power supplies / Changing output voltage on SSR01
« Last post by zidor28 on 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.
79
Headphone amplifiers / Re: QRV-08 gain reduction
« Last post by peranders on September 12, 2019, 07:30:03 AM »
No...
80
Headphone amplifiers / Re: QRV-08 gain reduction
« Last post by Hodgin on September 11, 2019, 03:42:45 PM »
Do 330 ohms impact anything else besides the gain?
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