2254C build/support thread

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ptron said:
My traffo suposedly is 15V 1A secondaries.. Why is it givin out 46 - 47V? :p

Why water is wet? ;)
I guess you connected the secondarys in series.
Two secondarys, each 15V, in series, gives 30VAC. Maybe bit more when unloaded.
After rectifier, 30*1.4=42V DC. Nothing unexpected. Change the trafo to 24V AC 1A and enjoy.
 
Sylvain D. said:
Hey Ptron,

I have 37v at ps cap.
And temperature at ps regulator "heat sink" seems to stabilise at about 49c (after about 7 or 8 minutes)
Is this normal temperature Igor?

Yep, seems OK; you can take bigger heatsink if you like the power supply run "easier".
 
Ok.
I'm at a loss here.  :-\
I've searched the forum and I haven't seen anyone else with this issue.
Everything seems to work as expected but the ratio control does not seem to work.

Any thoughts or suggestions?


 
Sylvain D. said:
Ok.
I'm at a loss here.  :-\
I've searched the forum and I haven't seen anyone else with this issue.
Everything seems to work as expected but the ratio control does not seem to work.

Any thoughts or suggestions?
Double check your ratio switch wiring and make sure the associated molex connectros are making good connections.
 
I have this power supply

223-8538

Doc: http://docs-europe.electrocomponents.com/webdocs/0028/0900766b800284c0.pdf

I have read almost everything but it still do not get the first thing right, the incoming power!!!
So, is this the right power supply and how can I connect this? 2x12 or in serie?

Thanks in advance.

M.
 
MrBlomski said:
I have this power supply

223-8538

Doc: http://docs-europe.electrocomponents.com/webdocs/0028/0900766b800284c0.pdf

I have read almost everything but it still do not get the first thing right, the incoming power!!!
So, is this the right power supply and how can I connect this? 2x12 or in serie?

Thanks in advance.

M.

If your Toroid is a dual secondary with 2 x 12V, I'd wire it in Series to get the required 24V.
Make sure to get the phasing correct- Black dots on your toroid schematic. Here's a reference image that was for Ptrons 2 x15V transformer.
http://www.delabs-circuits.com/cirdir/electric/tables/transformer_types.png
 
Hi Igor,

I still have not received my 2254 stereo kit + power supply after 10 weeks.  Nor have you had the courtesy to respond to my emails or bother checking your tracking information.  Please take care of this issue as soon as possible so we can keep this a civil matter.

Thanks!

Damon
 
Got my stereo kit today. 6 weeks to the US for anyone who may wish to know. I'm confident it will be worth the wait.

Thanx

Andrew
 
I've had my completed 2254c unit sitting on the shelf for a long time.
I don't understand something about the calibration procedure.
Any help? See image.
 

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So I am testing the power supply and I got 37 Volt on C1 and 24,06 Volt on the end. So that is good :)
But is there any use for the R6 (for adjustment only) section, the +CV and -CV?

Do I have to ground with G2?

Cheers,

M.

 
Hi

I'm busy building from Igors stereo kit and I have gotten 4x 470uF 25v tall and thin looking gold and black electrolithic caps and 2x 470uF 16v thin and short silver and blue electrolithic caps (all radial)

The bom calls for
1 (2 stereo) 470u 25v low ESR for C15'
1 (2) 470..680u 25v audio for C4
1 (2) 330..470u 25v audio for C"17

Now logic would tell me this is 4x audio caps for C4 and C"17 ie. the 4x 470u 25v gold and black caps I've been given.

and 2x low ESR caps for C15' ie. the 2x 470u 16v silver and blue caps I've been given.

My question is given that the bom calls for a 25v cap for all of these and I have been given a 16v cap, presumably this is okay as Igor made the kit - but is it okay for C15' to be 16v if not is 16v better at c4 or c"17?

 
Maybe my trannies are reversed?
So intr1 = carnhill VTB9045
and intr2 = carnhill VTB9046

Can anyone confirm this is correct?

Thanks.

M.
 

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Hey MrBlomski
I can't tell for sure, but it looks like the label on your back transformer is 9045, which I believe is backwards. Look at my pic here. I have 9045 in the other position.
duantro said:
I finally got this thing put together. It fires up with no black smoke!!
Tomorrow I will take it to the studio and see how it sounds. I can't wait.
Edit: The photo didn't copy. The post is #643. 
 
duantro said:
Hey MrBlomski
I can't tell for sure, but it looks like the label on your back transformer is 9045, which I believe is backwards. Look at my pic here. I have 9045 in the other position.
duantro said:
I finally got this thing put together. It fires up with no black smoke!!
Tomorrow I will take it to the studio and see how it sounds. I can't wait.
Edit: The photo didn't copy. The post is #643.

But youre INTR1 = VTB9046 and youre INTR2 = VTB9045
So could I switched and reversed INTR1 with INTR2 ?!!??!? Thats a double suck :)

I trace the carnhill pinouts with a multimeter and came with the following results

INTR1 = VTB9045 for low level microphone input
INTR1 Pin1 Molex PRI + = Pin 7 VTB9045
INTR1 Pin2 Molex PRI - = Pin 10 VTB9045
INTR1 Pin3 Molex GND = Pin 11 VTB9045
INTR1 Pin4 Molex SEC + = Pin 2+3+4 VTB9045
INTR1 Pin5 Molex SEC - = Pin 5 VTB9045

INTR2 = VTB9046 for line level input
INTR2 Pin1 Molex PRI + = Pin 2 VTB9046
INTR2 Pin2 Molex PRI - = Pin 5 VTB9046
INTR2 Pin3 Molex GND = Pin 11 VTB9046
INTR2 Pin4 Molex Sec + = Pin 7 VTB9046
INTR2 Pin5 Molex Sec - = Pin 6 + 10 VTB9046

 

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