Salas hotrodded blue DCB1 build - Page 132 - diyAudio
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Old 6th September 2011, 10:20 AM   #1311
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using 68/68 but I did not see the default 47/47. I was probably reading an old post when I built it.

I installed small aluminum sinks for the ones getting warm (about 50 degrees F)

works like a charm. Only issue remaining is the gainclone blowing fuses (no soft start installed).

next project will be stage 2 dcb1 and F5 in aluminum casing.

thanks again for this relatively easy build for a starter like me.
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Old 6th September 2011, 10:43 AM   #1312
Salas is online now Salas  Greece
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As it is with naked output Mosfets, 68//68 is best. Happy listening.
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Old 6th September 2011, 10:54 AM   #1313
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Again !

"
OK, i changed JFETS, and now i have:

on R10-1: 2,037V / 279.8mA
on R10-2: 1.813V / 241.0mA

on Shunt output i have:
+9.85V / 196.4mA
-9.86V / 171.9mA

on LOUT i have: -0.8mV
on ROUT i have: -1.5mV

Also ma matched all LEDS on 1.848V and triplets on 1.850V !

What else i should do, or this is good enough ?

"
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Old 6th September 2011, 11:17 AM   #1314
Salas is online now Salas  Greece
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Nothing, its good. Your CCS calculations are rather ~200 & ~180mA well near targets. Offset is excellent. Vout matching is excellent.
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Old 6th September 2011, 11:28 AM   #1315
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Quote:
Originally Posted by Salas View Post
Nothing, its good. Your CCS calculations are rather ~200 & ~180mA well near targets. Offset is excellent. Vout matching is excellent.
Thanx ! This is what i want to hear ...

Is there a way i can add gain to whole pramp - maybe 10-12 dB!

liek JISBOS or some UnityGain ... Just thinking to add a little punch !
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Old 6th September 2011, 12:01 PM   #1316
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by komigenie View Post
Is there a way i can add gain to whole pramp - maybe 10-12 dB!.................. Just thinking to add a little punch !
This seems an odd request.

Does your system "need" more gain.
How much attenuation do you currently use at "normal" listening levels and at "loud" listening levels?

Adding "punch" seems more like adding deliberate distortion to change the sound to something that better suits your ears/speakers/room.
__________________
regards Andrew T.
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Old 6th September 2011, 03:58 PM   #1317
syklab is offline syklab  Hong Kong
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Hi,
Can I use a transformer with 30VA 15V x 2 for the DCB1 ? Is the output current and voltage enough for hot rodding it? If not then can I use 2 transformers (1 per rail) and parallel the secondary winding to obtain higher current output?

Thanks
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Old 6th September 2011, 05:13 PM   #1318
Salas is online now Salas  Greece
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One 30VA for 200mA CCS is good enough.
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Old 6th September 2011, 05:19 PM   #1319
syklab is offline syklab  Hong Kong
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Hi Salas,
I am planing for the stage 2 600ma with 3R3 5W, will the 30VA sufficient enough?
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Old 6th September 2011, 05:26 PM   #1320
Salas is online now Salas  Greece
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No. It can give the current but It will go hot.
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