Mezmerize DCB1 Building Thread - Page 23

Salas · 14th February 2011, 04:21 PM

Quote:

Originally Posted by superluca71

Voltage drop: 2.18v and 2.24v

DC Offset 1.2mv and 2.2mv

Very well. You may listen to it. Post that picture to see how you assembled it if handy.

AndrewT · 14th February 2011, 06:17 PM

Quote:

Originally Posted by superluca71

20 v-
10 v+

Quote:

Originally Posted by superluca71

just a burned led!

now i have -10,15v and +10,35v

I wonder if one Shunt LED was in back to front?

They are diodes but they fail with a very low reverse voltage.
20V in reverse across a LED might well "burn it".

superluca71 · 14th February 2011, 07:11 PM

Quote:

Originally Posted by AndrewT

I wonder if one Shunt LED was in back to front?

They are diodes but they fail with a very low reverse voltage.
20V in reverse across a LED might well "burn it".

No it was mounted right way, maybe to much time on it with the solder iron...

superluca71 · 15th February 2011, 07:36 AM

still something to mount...

x Salas & Andrew:

Do you think i can hot rod this , just to add little more gain?
and how?

Salas · 15th February 2011, 07:45 AM

Only if you had mounted the mosfets to the floor *see ramallo's a few pages back. Then you could use 10R 5W or 22R//22R 2W where your 68R//68R are now and achieve around 200mA CCS with your Vdrops. With the little sinks you got its dangerous. Hot rod achieves more robust sonics from the regs, not voltage gain by the way.

superluca71 · 15th February 2011, 07:47 AM

Quote:

Originally Posted by Salas

Only if you had mounted the mosfets to the floor *see ramallo's a few pages back. Then you could use 10R 5W or 22R//22R 2W where your 68R//68R are now and achieve around 200mA CCS with your Vdrops. With the little sinks you got its dangerous. Hot rod achieves more robust sonics from the regs, not voltage gain by the way.

Thanks a lot!

erikdebier · 17th February 2011, 06:48 PM

Hey guys,

I've just powered up my Mesmerize for the first time and something seems wrong

One of led arrays won't light, it's the one containing 5 leds. The other side does light up however. I've been looking at pictures from your builds and from the looks of it I got all the parts oriented correctly (caps, transistors, leds).

I've measured the voltage drop accross 68R CCS resistors which is as follows:
- 5.2V accross the side that's working
- 2.3V accross the side that's not working

I guess that's not correct.

I'm using a 230V/2x12V 50VA tranny.

Do you guys have an idea of what might be wrong?

Cheers!
Erik

Tea-Bag · 17th February 2011, 07:03 PM

do a diode test across the unlit LED.

erikdebier · 17th February 2011, 08:19 PM

Quote:

Originally Posted by Tea-Bag

do a diode test across the unlit LED.

Thanks for your quick response!

All the individual leds in the array seem fine and the array seems to react similar to the one on the other side.

Is there anything more specific I should look for?

Cheers!
Erik

Salas · 17th February 2011, 08:22 PM

Maybe the Jfet under the array which pulls current through is dead? One array faces the other way than its opposite as a whole mind you. Also 5.2V across the 68//68R on the side that IS working is too much. Are the Mosfets the correct types in each position?

17th February 2011, 07:03 PM	#228
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15th February 2011, 07:45 AM	#225
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Only if you had mounted the mosfets to the floor *see ramallo's a few pages back. Then you could use 10R 5W or 22R//22R 2W where your 68R//68R are now and achieve around 200mA CCS with your Vdrops. With the little sinks you got its dangerous. Hot rod achieves more robust sonics from the regs, not voltage gain by the way.

17th February 2011, 06:48 PM	#227
erikdebier diyAudio Member Join Date: Sep 2004 Location: Rotterdam	Hey guys, I've just powered up my Mesmerize for the first time and something seems wrong One of led arrays won't light, it's the one containing 5 leds. The other side does light up however. I've been looking at pictures from your builds and from the looks of it I got all the parts oriented correctly (caps, transistors, leds). I've measured the voltage drop accross 68R CCS resistors which is as follows: - 5.2V accross the side that's working - 2.3V accross the side that's not working I guess that's not correct. I'm using a 230V/2x12V 50VA tranny. Do you guys have an idea of what might be wrong? Cheers! Erik

17th February 2011, 08:22 PM	#230
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Maybe the Jfet under the array which pulls current through is dead? One array faces the other way than its opposite as a whole mind you. Also 5.2V across the 68//68R on the side that IS working is too much. Are the Mosfets the correct types in each position?