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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 14th February 2019, 05:38 AM   #3591
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by PKI View Post
Stupid question... as usual hehe :-). Why different resistors for + and -?
+Rail swings current -Rail is just CCS in this preamp circuit
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Old 14th February 2019, 05:50 AM   #3592
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Quote:
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Then use 2.4R in each NEG and 1.8R in each POS
Thanks Salas! 5W square whitish OK?
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Old 14th February 2019, 05:54 AM   #3593
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
2W is more than enough and there is metal film low ppm also to find in this power rating
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Old 14th February 2019, 06:27 AM   #3594
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Already picked up everything from mouser, wouldn't want to do another order.. so have to choose from what's in local stores. 2.4R non-existent, especially in metal film. Will have to go for these 5W as it is the only option
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Old 14th February 2019, 07:04 AM   #3595
Salas is online now Salas  Greece
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Not the end of the world. White cement brick resistors should work well enough and there is space provision for big parts in the UBiB's R1 place
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Old 14th February 2019, 03:40 PM   #3596
PKI is offline PKI  United States
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Salas View Post
+Rail swings current -Rail is just CCS in this preamp circuit
I see, thank you! From UBIB manual I understood that the resistors are limiters, so why just not put two 1R8?
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Old 14th February 2019, 06:49 PM   #3597
Salas is online now Salas  Greece
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To save some total dissipation in the box
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Old 14th February 2019, 07:59 PM   #3598
PKI is offline PKI  United States
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I see, make total sense.
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Old 17th February 2019, 07:41 PM   #3599
IDM is offline IDM  United Kingdom
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Hi,

After all the issues with a fried J1. I finally got the DCG3 finished and whilst not completely boxed up yet, I have been able to drop it into the system. I am using to feed my Pass F5 and I have to say it is truly superb. It just seems so agile, detailed but musical. I am totally delighted.

So again thanks for the advise in getting it sorted.

I am using it with dual mono PSU with 4X ultraBIB regs and I see a few posts back that I should change the R1 values for the negative and positive regs.
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Old 17th February 2019, 08:07 PM   #3600
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Congratulations!

Using BC327 for Q1 Q2 already I suppose. What R1s you use in the UBiBs, and is the dissipation manageable?
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