Salas hotrodded blue DCB1 build - Page 429 - diyAudio
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Old 26th August 2014, 12:29 PM   #4281
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yup, did that too, but it hardly gave me a measurement.
I might have not set the right range on my multimeter.
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Old 26th August 2014, 01:25 PM   #4282
Salas is offline Salas  Greece
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If the output relay clicks, thus the output connectors are in live mode, you most probably simply got low offset. Try the 300mV Fluke 75's range too.
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Old 26th August 2014, 03:03 PM   #4283
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I redesigned BOZ PCB to fit in same enclosure with DCB1 , kinda crowded in mine ...

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Old 26th August 2014, 10:10 PM   #4284
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Default DCB1 ready for gain stage LoL - [picture heavy]

Here is my build :

MODU all aluminum case with 10mm Faceplate, laser engraved - with oversized solid aluminum knobs and SS vandal switch wired to AMB LABS soft start ...
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ELMA 2 position rotary switch for input selector, And KHOZMO Attenuator mounted on 5mm aluminum brackets and connected to SS extension rods with aluminum couplers ...
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Antek Inc. transformer in Antek transformer cover - laser engraved ...
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Yeah, some Z-Foils, Caddocs, Silmics etc, etc ...
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Multicap capacitor on shunt ...
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Oversized SS Screws ensure solid tight contacts with heatsinks ...
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Input RCAs, on back plate, laser engraved
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Khozmo attenuator 20kOhm, with custom PCB and Z-Foils soldered ...
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External processor loop RCAs with switch - for equalizer or what ever ...
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Miniature linear Ball Bearings mounted on front faceplate to ensure smooth and quiet 42 steps attenuator operation ...
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Custom PCBS for RCAs and Swith on rear plate ...
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Teflon silver plated copper wire soldered to input selector ...
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... and waiting for Bride Of Zen Gain stage to be done ... :-)
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To Be Continued ...

Thnx for looking and sorry for heavy pics ....
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Old 27th August 2014, 12:02 AM   #4285
Salas is offline Salas  Greece
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Inspired looks and execution. Congrats.

You could plan a gain mode bypass switch because not all amps or all listening sessions will need the add on gain module and a straight DCB1 mode will sound more transparent.
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Old 27th August 2014, 10:48 AM   #4286
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Quote:
Originally Posted by Salas View Post
Inspired looks and execution. Congrats.

You could plan a gain mode bypass switch because not all amps or all listening sessions will need the add on gain module and a straight DCB1 mode will sound more transparent.

Hum, something like this :


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Old 1st September 2014, 06:50 PM   #4287
stax92 is offline stax92  United Kingdom
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Quote:
Originally Posted by Salas View Post
Its fine, now measure mV DC across each channel's output, and if less than 5mV its all done and ready.
Hmm.. I got 2mV on one channel, rock steady but on the other channel it's constantly changing between about 300 to 800mV. It seems to jump in stages to about 800mv then drops and starts rising again. I just measured it again and it went up to 1v and bounced around there for a while. After a few more measurements it seems to start around 100mV and then climbs gradually in up and down steps. It seems to stabilise at about 1v but it only climbs when I measure it.

On Vout I get +9.86 and -9.89. Vdrop across the two 10 Ohm CCS resistors is 1.63v and 1.73

Any ideas what the problem could be?

Last edited by stax92; 1st September 2014 at 07:10 PM. Reason: more measurement
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Old 1st September 2014, 07:31 PM   #4288
stax92 is offline stax92  United Kingdom
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After about half an hour it now jumps a little between 1.3mV and 1.7mV.

Very odd... has it fixed itself!!
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Old 1st September 2014, 07:48 PM   #4289
stajo is offline stajo  Sweden
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Maybe you should start with wetting all your solderings on that channel?
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Old 1st September 2014, 07:53 PM   #4290
Salas is offline Salas  Greece
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That's very odd, never reported before. Check for cold joints, knock lightly on some semis with a screwdriver while on, rework with the iron. Especially for the signal JFETS on the weird channel. Make sure it never occurs again at any time, before attempting connection to an audio sysyem especially if there is a DC coupled power amp there.
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