Salas hotrodded blue DCB1 build - Page 132

necplusultra · 6th September 2011, 10:20 AM

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.

Salas · 6th September 2011, 10:43 AM

As it is with naked output Mosfets, 68//68 is best. Happy listening.

komigenie · 6th September 2011, 10:54 AM

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 ?

"

Salas · 6th September 2011, 11:17 AM

Nothing, its good. Your CCS calculations are rather ~200 & ~180mA well near targets. Offset is excellent. Vout matching is excellent.

komigenie · 6th September 2011, 11:28 AM

Quote:

Originally Posted by Salas

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 !

AndrewT · 6th September 2011, 12:01 PM

Quote:

Originally Posted by komigenie

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.

syklab · 6th September 2011, 03:58 PM

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

Salas · 6th September 2011, 05:13 PM

One 30VA for 200mA CCS is good enough.

syklab · 6th September 2011, 05:19 PM

Hi Salas,
I am planing for the stage 2 600ma with 3R3 5W, will the 30VA sufficient enough?

Salas · 6th September 2011, 05:26 PM

No. It can give the current but It will go hot.

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6th September 2011, 10:20 AM	#1311
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	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.

6th September 2011, 10:43 AM	#1312
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	As it is with naked output Mosfets, 68//68 is best. Happy listening.

6th September 2011, 10:54 AM	#1313
komigenie diyAudio Member Join Date: Jan 2006 Location: Spring Lake, NC	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 ? "

6th September 2011, 11:17 AM	#1314
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Nothing, its good. Your CCS calculations are rather ~200 & ~180mA well near targets. Offset is excellent. Vout matching is excellent.

6th September 2011, 03:58 PM	#1317
syklab diyAudio Member Join Date: Jul 2009 Location: Hong Kong	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

6th September 2011, 05:13 PM	#1318
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	One 30VA for 200mA CCS is good enough.

6th September 2011, 05:19 PM	#1319
syklab diyAudio Member Join Date: Jul 2009 Location: Hong Kong	Hi Salas, I am planing for the stage 2 600ma with 3R3 5W, will the 30VA sufficient enough?

6th September 2011, 05:26 PM	#1320
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No. It can give the current but It will go hot.