Hello World,
there are just two cases left to care about.
First is poor Tony B.
Your package is bound to leave this friday.
(Allmost payed first and delivered last, sorry)
The other one is:
And i do stand for the fact NOBODY (but me) lost
a penny in this GB !
All three other guys are going to get their goods immediately.
(In fact, somewhere in GB, there should be something today.)
A last word from my side may be permitted;
by now i am chewing on a little essay about what i have
experienced during this GB.
It will be lenghty a bit and not really funny.
Never imagined so many obstacles...
One more last word;
There should be so many satisfied friends out there,
it would have been nice to get a good word to keep
the waves calm.
All the best.
there are just two cases left to care about.
First is poor Tony B.
Your package is bound to leave this friday.
(Allmost payed first and delivered last, sorry)
The other one is:
I do honestly have no idea who hides behind this nick.
And i do stand for the fact NOBODY (but me) lost
a penny in this GB !
All three other guys are going to get their goods immediately.
(In fact, somewhere in GB, there should be something today.)
A last word from my side may be permitted;
by now i am chewing on a little essay about what i have
experienced during this GB.
It will be lenghty a bit and not really funny.
Never imagined so many obstacles...
One more last word;
There should be so many satisfied friends out there,
it would have been nice to get a good word to keep
the waves calm.
All the best.
Hi Peter
Yes I’ve done a few small scale GB’s and whilst I enjoyed the idea of people having something nice for me it was all work and very little thanks.
I hardly ever heard back when a build went well but if there was a problem then it all came back.
loose money, yup I can't think of a single GB that I've done and not lost cash on it.
So not as much praise as there should be for someone giving so much of their free time to help others.
IMHO this was a pretty big GB for one person to handle and more offers of help from the start may have been nice.
It makes me wonder why people still take on GB but they do.
Hero’s every one of them.
Maybe more help and many hands is the answer for the large GB.
BTW I’m not part of this GB but knowing how hard they can be I thought that I’d offer my support anyway.
Only three hiccups and so many boards sent out.
Well done
ATB.
Yes I’ve done a few small scale GB’s and whilst I enjoyed the idea of people having something nice for me it was all work and very little thanks.
I hardly ever heard back when a build went well but if there was a problem then it all came back.
loose money, yup I can't think of a single GB that I've done and not lost cash on it.
So not as much praise as there should be for someone giving so much of their free time to help others.
IMHO this was a pretty big GB for one person to handle and more offers of help from the start may have been nice.
It makes me wonder why people still take on GB but they do.
Hero’s every one of them.
Maybe more help and many hands is the answer for the large GB.
BTW I’m not part of this GB but knowing how hard they can be I thought that I’d offer my support anyway.
Only three hiccups and so many boards sent out.
Well done
ATB.
Peter,
Once again thanks from me for your greta work on this GB. I don't think anybody who participated would be happy to learn that as a result of all the effort you have gone to for others, you are out of pocket on this. I'd be happy to wire you a bit more money to help make up your shortfall.
Once again thanks from me for your greta work on this GB. I don't think anybody who participated would be happy to learn that as a result of all the effort you have gone to for others, you are out of pocket on this. I'd be happy to wire you a bit more money to help make up your shortfall.
hey
one question about the RIAA caps.
i havt the custom V-Caps, means only one Cap with the needed values of 33nF and 11nF
i think they should be connected like this:
green: "positive" Side of the Cap
Blue: "negative" Side of the Cap
am i right?
thank you!
one question about the RIAA caps.
i havt the custom V-Caps, means only one Cap with the needed values of 33nF and 11nF
i think they should be connected like this:
green: "positive" Side of the Cap
Blue: "negative" Side of the Cap
An externally hosted image should be here but it was not working when we last tested it.
am i right?
thank you!
Hello,
I've built my prereg boards but the transformers are noisy.
May be I've done a mistake?
Anybody can take a look of the pictures.
The boards are for 230V and have about 42V on the output without load.
Thanks a lot for your help.
Ciao
Guglielmo
I've built my prereg boards but the transformers are noisy.
May be I've done a mistake?
Anybody can take a look of the pictures.
The boards are for 230V and have about 42V on the output without load.
Thanks a lot for your help.
Ciao
Guglielmo
Attachments
Hello Guglielmo,
no, regarding your pictures, you build it proper.
"It's not a bug, it's a feature"
Some builders here in germany experienced more
or less the same.
After crossing out any external influence (DC for example)
i decided to ask Block (the manufacturer of those blue thingies)
about this issue.
Prior to do so i took a look @ the datasheet trying to find out
how much noise is allowed in the specs.
To my surprise, mechanical noise (hum) is not even mentioned !
First worthwile information i got, was "A transformer who do not hum is defective"
!?!
We agreed on i've to send them one channel of the prereg
and they will test it in their lab.
Reply:
"No audible hum !",
but: "if there is any, it should be a result of the excessive
coils (inductors) build in this circuit."
(I've got a lab-report on that)
Sadly, it happened to be, they've ain't got any example of my
production lot in their stock anymore.
After another few of E-mails and telephone calls we agreed to
trade the exchanged (Hummy) and the rest of my stock for
another production lot.
They are not even as half as loud, but still not really quiet.
Conclusio;
If there is any issue regarding this, try to find out how to fix it best.
The choices are;
1st:
If you are in Germany/Europe, you can send me your "Hummers"
and i will send you the better ones in return. But remember, my
stock is not endless !
2nd:
If you are located outside of europe, you can try the same.
but the shipping cost might probably exceed the worth of parts.
Therefore it might be cheaper to buy those in your corner of the world
and proceed to step 3 .
3rd:
Try your luck in contacting the manufacturer by yourself.
I am really sorry to have no better information, but i did my very
best.
no, regarding your pictures, you build it proper.
"It's not a bug, it's a feature"
Some builders here in germany experienced more
or less the same.
After crossing out any external influence (DC for example)
i decided to ask Block (the manufacturer of those blue thingies)
about this issue.
Prior to do so i took a look @ the datasheet trying to find out
how much noise is allowed in the specs.
To my surprise, mechanical noise (hum) is not even mentioned !
First worthwile information i got, was "A transformer who do not hum is defective"
!?!
We agreed on i've to send them one channel of the prereg
and they will test it in their lab.
Reply:
"No audible hum !",
but: "if there is any, it should be a result of the excessive
coils (inductors) build in this circuit."
(I've got a lab-report on that)
Sadly, it happened to be, they've ain't got any example of my
production lot in their stock anymore.
After another few of E-mails and telephone calls we agreed to
trade the exchanged (Hummy) and the rest of my stock for
another production lot.
They are not even as half as loud, but still not really quiet.
Conclusio;
If there is any issue regarding this, try to find out how to fix it best.
The choices are;
1st:
If you are in Germany/Europe, you can send me your "Hummers"
and i will send you the better ones in return. But remember, my
stock is not endless !
2nd:
If you are located outside of europe, you can try the same.
but the shipping cost might probably exceed the worth of parts.
Therefore it might be cheaper to buy those in your corner of the world
and proceed to step 3 .
3rd:
Try your luck in contacting the manufacturer by yourself.
I am really sorry to have no better information, but i did my very
best.
Thanks for the report Peter,
If so, then (I think) you are saying that the transformer interacts with the coils and by that interaction (resonance) is created and this energy is reflected to the transformer (partly) and that creates noise (or something like this).
If this is true (and the above is sort of a question) then it should be possible to dampen it. Most probably by adding a small resistance in series with the transformer (before and after the coils should be tried).
For the size of this resistor (in this experiment) I would say 5 Ohm to start with.
Anny takers? let me know ...
P.s. (especially when adding this resistor) it may be useful to add a small snubber in parallel to the secondary when the resistor is in series with it.
If so, then (I think) you are saying that the transformer interacts with the coils and by that interaction (resonance) is created and this energy is reflected to the transformer (partly) and that creates noise (or something like this).
If this is true (and the above is sort of a question
) then it should be possible to dampen it. Most probably by adding a small resistance in series with the transformer (before and after the coils should be tried).For the size of this resistor (in this experiment) I would say 5 Ohm to start with.
Anny takers?
let me know ...P.s. (especially when adding this resistor) it may be useful to add a small snubber in parallel to the secondary when the resistor is in series with it.
Last edited:
Good that I started/opened with an 'If so, .. '
So this report, what is it ... (bogus I guess?)
Also, if this hum is there with no current flowing (naked transformer connected to the net) then it (most probably) is a DC-component of the net. Use a DC blocker, see Mains DC and Transformers
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