Mezmerize DCB1 Building Thread - Page 49 - diyAudio
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Old 10th March 2012, 09:33 PM   #481
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- Would it be okay if I use the Antek AS-4434 where the 2x34V supplies a classdaudio Heavy Duty DC power supply and the 2x15V supplies the Mezmerize board?
Thanks Salas. Will the AS-4434 work in the above configuration?
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Old 10th March 2012, 09:48 PM   #482
Salas is offline Salas  Greece
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Why not? It has 15+15V taps I see. Tie the inner brown & orange to the middle point of DCB1's Tx connector and the remaining brown & orange ones to its side inputs each.
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Old 11th March 2012, 01:37 AM   #483
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Exactly what I thought. Thanks again.
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Old 11th March 2012, 04:34 PM   #484
Rush is offline Rush  United States
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Default Mosfet substitution

Salas,

I hate to ask this if it has been answered some where else, but here goes.

I bought several parts kits from Teabag for the Salas SSLV1.1 BIB and I have some kits left over that I thought at the time I could use in the Mezmerize DCB1 and Hypnotize boards.
Of course the Mosfets are different and was wondering if I could plug in the IRF9610 / IRF610 and IRF9530 / IRF530 Mosfets in place of the IRFP9240 and IRFP240 Mosfets? If so, what other resistor values need to be changed?

Thanks as always for your help.

By the way, I am building your: Salas Simplistic NJFET RIAA using the Salas SSLV1.1 BIB regulators boards and the Mezmerize DCB1 for the preamp/selector and finally an electronic crossover using the B1 type buffers in a 24 db per octave 2 way crossover. I will use a pair of the Hypnotize boards (one per channel) to power all the B1s in the crossover (8 per channel), see attached, all in one case,
I will build an out-board case for the transformer with bridges, rectifiers and caps.

Your thoughts are alway appreciated.

Rush
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File Type: pdf Crossover 24dB_HP LP k170.pdf (9.1 KB, 65 views)
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Old 11th March 2012, 05:10 PM   #485
Salas is offline Salas  Greece
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It does not seem like it will be oscillating if you keep everything the same but the Mosfet types, its compatible theoretically. Take care to insulate the TO-220s well, they aren't as easy for that as the TO-247s. It will be a bit higher impedance, certainly not put together and critically judged for a DCB1 as a whole in the development stage, can be good enough I guess, don't know more. Certainly cheaper and a tad uglier.
Good luck with the assortment as a total, and keep us posted.
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Old 11th March 2012, 08:48 PM   #486
Rush is offline Rush  United States
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Originally Posted by Salas View Post
It does not seem like it will be oscillating if you keep everything the same but the Mosfet types, its compatible theoretically. Take care to insulate the TO-220s well, they aren't as easy for that as the TO-247s. It will be a bit higher impedance, certainly not put together and critically judged for a DCB1 as a whole in the development stage, can be good enough I guess, don't know more. Certainly cheaper and a tad uglier.
Good luck with the assortment as a total, and keep us posted.
Thank you Salas,

Whoa! You said the magic words, "higher impedance" "good enough", I will use the original design with IRFP9240 and IRFP240 Mosfets.

Any body need 5 pos and 5 neg Salas SSLV1.1 BIB kits as sold by Teabag's group buy? Free shipping in USA.

Rush
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Old 12th March 2012, 03:07 PM   #487
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What are the dissipation requirements of the current setting resistor at 3r3?

Thanks,

Greg
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Old 12th March 2012, 03:16 PM   #488
udailey is offline udailey  United States
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Rush, link us to your equalizer build. Sounds fun!
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Old 12th March 2012, 05:55 PM   #489
AndrewT is offline AndrewT  Scotland
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What are the dissipation requirements of the current setting resistor at 3r3?
P = I^2 * 3r3
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Old 15th March 2012, 07:53 AM   #490
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finished the blackboard build. measurement on the output voltage fine as well as on r1. but, after about a couple of minutes, the left side string of 5 leds will shut off and the voltage output jump to 15v. it will come back on after 10-30 seconds. what is wrong?
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