Mezmerize DCB1 Building Thread - Page 41

Atilla · 8th November 2011, 10:25 PM

I meant, I didn't do the circuit myself. It was an assembled board, as per the UPC1237 Datasheet, without the "Overload protection" pin being used for anything, only the offset detection.

Salas · 8th November 2011, 10:41 PM

It includes some start delay and needs its own DC PSU? 12V relay?

Atilla · 8th November 2011, 10:53 PM

You use the DC from the main PSU. A dropping resistor and a cap form the Turn-on constant. The board I got delays the speakers with about 3 sec. on turn on.

It's got an 'AC-gone' detection as well. If you use it, you drag a wire from the transformer to the circuit, via a half-wave rectifier. This way,on turn off, it disconnects the speakers immediately. If you don't want to use that, just wire that pin to DC+ as well.

Of course, there are numerous configurations possible. We have quite a few threads here that discus that IC, so there should be enough info for anyone.

Salas · 8th November 2011, 10:56 PM

chalkandtalk · 9th November 2011, 06:06 AM

Thank you all. Very helpful and useful.

Nikon1975 · 10th November 2011, 12:27 AM

Quote:

Originally Posted by Salas

Don't worry, the Vo imbalance in the Mez is designed in by me by voicing it. Its normal. On the resistors its a matter of Vgs and leds. PMOS & NMOS don't have the same ID/VGS curves. You can try have about same current there by trimming the resistors (Vrset/Rset=ICCS), but it won't change anything audibly at that range.

Dear Salas,

You mentioned this a number of times. I have always been fascinated by the concept of "voicing". Could you give some details about the process ?

Thanks,

Davide

Salas · 10th November 2011, 12:56 AM

Its a subjective touch after all technical is in order. Got to know your system and trust yourself. What kind of distortion profile, some PSU synergy, Iq, voltage point, maybe choice of influential parts values or makes. Keeping notes, trying for coherence in tone. Letting it play for a while, revisiting. Such stuff.

Nikon1975 · 13th November 2011, 01:34 PM

My two cent on the use of the DCB1 with F5: my DCB1 has been connected for 6 month now to my F5, I use it regularly, and never had a problem. Just I am careful on what and how I connect things. I check offset from time to time.

One question that I always wanted to ask: if I want to go balanced, do I really need to have a double PSU, of you think I can use a single psu, considering that mine is pretty high in current.

D.

Salas · 13th November 2011, 04:46 PM

This is one the few balanced users remain to reply. I have no personal experience into balanced DCB1.

Marinos · 19th November 2011, 05:45 PM

Hi all,
I have a question about the unmatched k170s. I have a tea-bag's bag of K170s. Keeping the 7-8 ma for B1 and Simplistic RIAA use, I have a lot of 6 and some of 9,10 ma to use.
Is there any preference between them ?

19th November 2011, 05:45 PM	#410
Marinos diyAudio Member Join Date: Mar 2003 Location: Athens	Hi all, I have a question about the unmatched k170s. I have a tea-bag's bag of K170s. Keeping the 7-8 ma for B1 and Simplistic RIAA use, I have a lot of 6 and some of 9,10 ma to use. Is there any preference between them ? __________________ Marinos

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8th November 2011, 10:25 PM	#401
Atilla diyAudio Member Join Date: Jul 2008	I meant, I didn't do the circuit myself. It was an assembled board, as per the UPC1237 Datasheet, without the "Overload protection" pin being used for anything, only the offset detection.

8th November 2011, 10:41 PM	#402
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	It includes some start delay and needs its own DC PSU? 12V relay?

8th November 2011, 10:53 PM	#403
Atilla diyAudio Member Join Date: Jul 2008	You use the DC from the main PSU. A dropping resistor and a cap form the Turn-on constant. The board I got delays the speakers with about 3 sec. on turn on. It's got an 'AC-gone' detection as well. If you use it, you drag a wire from the transformer to the circuit, via a half-wave rectifier. This way,on turn off, it disconnects the speakers immediately. If you don't want to use that, just wire that pin to DC+ as well. Of course, there are numerous configurations possible. We have quite a few threads here that discus that IC, so there should be enough info for anyone.

8th November 2011, 10:56 PM	#404
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece

9th November 2011, 06:06 AM	#405
chalkandtalk diyAudio Member Join Date: Jan 2006 Location: North west England	Thank you all. Very helpful and useful.

10th November 2011, 12:56 AM	#407
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Its a subjective touch after all technical is in order. Got to know your system and trust yourself. What kind of distortion profile, some PSU synergy, Iq, voltage point, maybe choice of influential parts values or makes. Keeping notes, trying for coherence in tone. Letting it play for a while, revisiting. Such stuff.

13th November 2011, 01:34 PM	#408
Nikon1975 diyAudio Member Join Date: Nov 2009 Location: Vienna	My two cent on the use of the DCB1 with F5: my DCB1 has been connected for 6 month now to my F5, I use it regularly, and never had a problem. Just I am careful on what and how I connect things. I check offset from time to time. One question that I always wanted to ask: if I want to go balanced, do I really need to have a double PSU, of you think I can use a single psu, considering that mine is pretty high in current. D.

13th November 2011, 04:46 PM	#409
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	This is one the few balanced users remain to reply. I have no personal experience into balanced DCB1.