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-   -   Salas DCG3 preamp (line & headphone) (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone.html)

RCruz 16th January 2017 02:38 PM

I have 10 zener that measure 9.8V.... will try those and see :)

xrk971 16th January 2017 03:17 PM

Should work fine. I have a delay circuit in another amp that called for 10v and Inusef 8.1v. Works fine.

RCruz 16th January 2017 06:38 PM

2 Attachment(s)
The sim.....

Salas 16th January 2017 06:52 PM

1 Attachment(s)
Your file does correct analysis (put .tran 0 10m 0 10n for better SNR)

For 1kHz 0dbV see attached run of your file

marcus1 16th January 2017 07:29 PM

DCSTB AC input?
 
I have two of the same multi-tapped transformers (found another one!) with secondary winding's of: 0v-9v-12v-15v-18v-21v-24v-30v

Each DCSTB requires an AC input of AC-CT-AC.
I'm not sure: Using my transformers, should I use the following taps for AC-CT-AC: 0v-9v-18v?

Thanks

Salas 16th January 2017 08:37 PM

Measure with AC meter across the taps but I think the most it can give you is 15-0-15 differences by utilizing the 0-15-30

RCruz 16th January 2017 08:42 PM

It sims better without the opamp..... can it be used without ?

Salas 16th January 2017 08:55 PM

1 Attachment(s)
Quote:

Originally Posted by RCruz (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4954001.html#post4954001)
It sims better without the opamp..... can it be used without ?

I advise against because it will eventually drift in use and such a decision will be a dangerous risk to any DC input coupled power amp system.

But I don't see any really worthwhile difference when simulating with an OP07 and my original file vs yours. In measuring practice I have only seen the TL082 chip adding to the noise floor and to the THD. All others I had were virtually innocuous for those two aspects.

marcus1 16th January 2017 08:57 PM

OK, thanks.

Just to get it going how about I use just one DCSTB board and feed the AC-CT-AC with both of my transformers so:

18v tap - 0v tap // 0v tap- 18v tap

Thanks

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4953996.html#post4953996)
Measure with AC meter across the taps but I think the most it can give you is 15-0-15 differences by utilizing the 0-15-30


Salas 16th January 2017 09:09 PM

In theory, yes. Provided you get the phase correct.


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