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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 7th February 2018, 06:03 AM   #2471
alexkosha is offline alexkosha  United States
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by fredlock View Post
Alexkosha, did you engrave it by your CNC? Good looking front panel. Good job.


Yes, it is. I made Front panel in the same exactly way as I did it for my first unit and I used CNC. All the rest of drilling I did manually in my garage.IMG_1499.JPG
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File Type: jpg IMG_1498.JPG (593.6 KB, 294 views)
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Old 7th February 2018, 07:02 AM   #2472
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Russellc View Post
Thanks for the tip...I have not yet affixed the heatsinks to the board. Somewhere in the reading, it suggested that. so I power up, measure the outputs for correct voltages, power down, and leave alone to bleed down a couple hours. Sound good?

Russellc
Yes, good plan. But only a few minutes will do. Just measure that their output voltage has fallen waaaay down before declaring the units empty of charge.
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Old 7th February 2018, 07:05 AM   #2473
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by alexkosha View Post
Thank you. The purpose of these images is to give you guy a close look and some ideas of assembly. I will be glad to answer if you have questions and please let me know if you need info about parts that I used. That unit is my second one (for my office use) and that time I desired to go with LDRs volume control. Fist one is running with Goldpoint 48 steps attenuator. It is amazing unit. This one is just finished and have very brief audition. Iíll report about my subjective opinion about its SQ in 2-3 weeks. Personal thanks to Salas for an exceptional support.
Excellent work there Alex. Congratulations. Making a second one means that you really liked the first one over time, happy to know that those preamp builds stand the test of time with many of you guys.
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Old 7th February 2018, 12:54 PM   #2474
fred sonnen is offline fred sonnen  Germany
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I do have a 4-way XLR connected HD650 headphone.
But I will use the DCG3 as a single ended connected Preamp.
What is the best way todo so?
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Old 7th February 2018, 01:32 PM   #2475
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
The HD650 uses removable cable with Y split and connection points at the bases of its cups so remove the bridged drive connecting four pin XLR terminated cable from it and use the original cable with the jack connector that came in the manufacturer's box. If you want to keep the special cable for some reason like custom length or its mechanical quality you have to remove the XLR and rewire to a jack. Tip is left channel, ring is right channel, sleeve is the grounds.
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Old 7th February 2018, 01:38 PM   #2476
steefdebruijn is offline steefdebruijn  Netherlands
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Is there a reason not to use

a) a conversion cable (from 4-pin xlr to standard stereo jack), or
b) mount a 4-pin female socket in the DCG3 chassis but wire it SE (so pins 1 and 3 to the SE outputs L+R and pins 2 and 4 to signal ground)?

Steef
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Old 7th February 2018, 02:06 PM   #2477
Salas is offline Salas  Greece
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No electrical reason not to do conversion things or extra socket than to have a straightforward cable and a less busy featured front panel.
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Old 7th February 2018, 02:41 PM   #2478
steefdebruijn is offline steefdebruijn  Netherlands
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Thanks,

I myself was planning to use *only* a 4-pin XLR on my chassis and wire it SE

Now I am pondering how on earth to back-mount a 4-pin Neutrik female panel connector to a 10mm thick front panel (considering these things have lock-tabs)...

Steef
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Old 7th February 2018, 03:07 PM   #2479
fred sonnen is offline fred sonnen  Germany
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Quote:
Originally Posted by steefdebruijn View Post
...
b) mount a 4-pin female socket in the DCG3 chassis but wire it SE (so pins 1 and 3 to the SE outputs L+R and pins 2 and 4 to signal ground)?
Steef
I think I will do so.

Quote:
Originally Posted by steefdebruijn View Post
Thanks,

I myself was planning to use *only* a 4-pin XLR on my chassis and wire it SE

Now I am pondering how on earth to back-mount a 4-pin Neutrik female panel connector to a 10mm thick front panel (considering these things have lock-tabs)...

Steef
... and using NC4FD-L-B-1front mount connectors ;-)
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Old 7th February 2018, 03:56 PM   #2480
steefdebruijn is offline steefdebruijn  Netherlands
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... or remove the lock-tab (has anyone tested this)?
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