Should I?

[PimD]

[quote author="tommypiper"]Someone mentioned some pages back that there is a stock transformer that looks to meet the PS transformer specs, except the 15v. http://www.antekinc.com/AN-1T250.pdf

The stock Antek will provide 250v (.5A), 12.6v(2amp)and 6.3v(3amp)

We need: 250V @ 80mA, 15V @20mA and 6.3V @3A

I'm always mixed up with different versions of milli -- is 80mA = .08A?

Is the 15v regulated? If so, we could probably get the 15v out of the 12.6v on the Antek? Someone tell me it will work, please. :grin:[/quote]

Is it possible to use this one from musikding.de
Has http://www.musikding.de/product_info.php/info/p1361_Toroidal-transformer-230V----250V--9V--24V.html

250V@ 100mA
9V @ 2.5mA
24V @ 100mA
Could get the 24 down to 15, with a nice big heatsink:thumb:

But is the 9V beefy enough?

 

[Jonkan]

Will there be a BOM published for this project, or will it arrive with the pcbs together with the schematic? If possible id like to order some stuff before i get the pcbs, as i need components for other projects also. To save on shipping.

Thanks!
/J

 

[bernbrue]

Hi,
as Volker mentioned before there will be a BOM published soon. The specs of the Musikding transformer won´t be sufficient for the pm670. You need:
134VA
prim.: 2x115V
sek.1: 250V/ 0,20A
sek.2: 9V/ 6,00A
sek.3: 2x 15V/2x1,00A
regards
Bernd

 

[codered]

I talked to Edcor this morning and they waived the setup after I told them about the quantity involved.We'll get the part number in 2 days and if there are no GB organisers US buyers can get it from them directly.

Question:

For the secondaries Bern says 15-0-15 and Analag says 18-0-18 .Can somebody confirm ASAP.Currently I have given 15-0-15 to Edcor

 

[[silent:arts]]

[quote author="codered"]For the secondaries Bern says 15-0-15 and Analag says 18-0-18 .Can somebody confirm ASAP.Currently I have given 15-0-15 to Edcor[/quote]
the 15-0-15 (or 18-0-18) is mainly for regulated -17V.
I haven't had any problem reaching this with the 15V version.

 

[tommypiper]

Seems better to go with 18v.

Is it a toroid?

What's the pricing?

 

[[silent:arts]]

15 * 1.41 = 21.2V
minus 3V for the regulator you have ?

the positive side is used for the bypass relays etc.
18V is not enough for +24V, but for +12V it would mean more more heat.
we have enough heat in this unit :green:

I would like to have the same specs from bernbrues transformer group buy,
and a toroid.

would make some support much simpler ...

 

[tommypiper]

[quote author="[silent:arts]"]

I would like to have the same specs from bernbrues transformer group buy,
and a toroid.

would make some support much simpler ...[/quote]

Yes, that sounds like a very good plan.

I'm afraid the Edcor is not a toroid. :roll:

 

[[silent:arts]]

[quote author="tommypiper"]I'm afraid the Edcor is not a toroid. :roll:[/quote]
mount it outside the case :grin:
I don't have experience with non toroid transformers and the XSMs.
but they are unshielded, and in a stereo unit you have 8 of them in the same box :shock:

 

[tommypiper]

Volker, how is your build coming?

 

[analag]

[quote author="tommypiper"]Volker, how is your build coming?[/quote]

Volker's build is coming along just fine...we are working closely on the thing.

analag

 

[flintan]

[quote author="[silent:arts]"]
we have enough heat in this unit :green:
[/quote]

This is one thing i'm a bit concerned about. I have some 3HE cases i'm thinking of trying to mount this beast in. I could use perforated top and bottom covers but when mounted in the rack this won't have the same effect. Hmmm, unless i put it on top of the other units.

Or i could cut out holes on the side and put some mesh there. Would this be enough? Any suggestions as how to keep it cool?

 

[emrr]

[quote author="flintan"][quote author="[silent:arts]"]
we have enough heat in this unit :green:
[/quote]

This is one thing i'm a bit concerned about. I have some 3HE cases i'm thinking of trying to mount this beast in. I could use perforated top and bottom covers but when mounted in the rack this won't have the same effect. Hmmm, unless i put it on top of the other units.

Or i could cut out holes on the side and put some mesh there. Would this be enough? Any suggestions as how to keep it cool?[/quote]

I've successfully used side ventilation, with nothing other than lots of small drilled holes.

 

[Emperor-TK]

How sensitive is the design to the tube brand, mu, matching, etc? The tubes can be bought from anywhere between $3 and $60 each (for matched tubes dipped in fairy dust). I just picked up a set of $3 tubes, at least to get started. Is there any way to do our own tube matching/selection other than by ear, or perhaps a way to calibrate the circuit to the tubes used?

Thanks,
Chris

 

[analag]

I guess you ain't read the first post I made when I started this thread. This mu compressor is not sensitive to tube mis-match. I did my homework in the cathode circuit to compensate for that.

analag

 

[Emperor-TK]

Thanks Analag. I wasn't following this project in the beginning and although I went back to catch up on it, I did miss that info.

-Chris

 

[Grooveteer]

If you are worried about heat this case might be an option?

http://www.modushop.biz/ecommerce/cat078_l2.php?n=1

Might be overkill, I don't know. (I'm considering this one, but I'll wait until I have the PCB and the toroid as I'm not sure if there's enough room in this case)

Cheers!

G

 

[elektrovolt]

what are the controls ? on the rendered pic I can see connections for gain, attack, treshold and a meter connection, and on the other side are some more... ?

Groo that one looks nice ! quite expensive, but I'm sure that you will be better off with a good sturdy case instead of a cheap thin piece of crap... this will be a heavy piece of gear

 

[[silent:arts]]

[quote author="elektrovolt"]what are the controls ? on the rendered pic I can see connections for gain, attack, treshold and a meter connection, and on the other side are some more... ?[/quote]
(Input) Gain, Threshold (or Compression), Attack (better: Time Constant)
and Bypass (or IN), Power, stereo link if you build a dual version.
the other connectors: remember you have to contact 4 transformers ...

 

[elektrovolt]

thanks Volker.

well, seems to be even better laid out and sophisticated than I thought !
good job.
how does the stereo link work ? I guess it just compensates for an uneven stereo image (dunno how to say that in english)

Jimi