substitute
Well-known member
I don't know what the deal is with those little extra holes, I ignored them and all is well.
2254C build/support thread
- Thread starter Igor
- Start date
Help Support GroupDIY Audio Forum:
I don't know what the deal is with those little extra holes, I ignored them and all is well.
juniorhifikit
Well-known member
kambo said:
Thanks. Here's a markup of what I was referring to - the extra holes are in red, and the pads that look like they're touching are in blue:
user 10827
Well-known member
- Joined
- Sep 21, 2007
- Messages
- 786
Hey guys,
Just to say, you may all have worked this out, and i built 4 working units already and this still almost got me, and there is probably good reason, but ive forgotten..
if you are using carnhill 9045(inter)/9046(input)
the PCB says for the input tx labelled 1, PRI & SEC, well these are the wrong way round relative to the connection next to it labelled INTR1. the SEC is wired to the PRI of the INTR1 connector.
make sense? as i say maybe there is a reason that i've now forgotten, but thought it was worth mentioning just in case that catches people out..
Pete
Just to say, you may all have worked this out, and i built 4 working units already and this still almost got me, and there is probably good reason, but ive forgotten..
if you are using carnhill 9045(inter)/9046(input)
the PCB says for the input tx labelled 1, PRI & SEC, well these are the wrong way round relative to the connection next to it labelled INTR1. the SEC is wired to the PRI of the INTR1 connector.
make sense? as i say maybe there is a reason that i've now forgotten, but thought it was worth mentioning just in case that catches people out..
Pete
Carlos Lima
Well-known member
One question:
Anyone got a substitute to the defunct (obsolete) BC-214C ?
Thanks
Carlos Lima
Anyone got a substitute to the defunct (obsolete) BC-214C ?
Thanks
Carlos Lima
BC107 or 109 for 184;
BC177 or 179 for 214
Beta (h21e):
A ~100
B~200
C >400
C will fit. B-marginally OK.
http://il.farnell.com/semelab/bc179/transistor-pnp-to-18/dp/1208594
http://il.farnell.com/multicomp/bc109c/transistor-npn-to-18/dp/9206809
BC177 or 179 for 214
Beta (h21e):
A ~100
B~200
C >400
C will fit. B-marginally OK.
http://il.farnell.com/semelab/bc179/transistor-pnp-to-18/dp/1208594
http://il.farnell.com/multicomp/bc109c/transistor-npn-to-18/dp/9206809
Carlos Lima
Well-known member
Thanks
Carlos Lima
Well-known member
Still having problems to find BC179 "C". After a search into Fairchild database, found this:
BC559B / BC559C
http://www.fairchildsemi.com/ds/BC/BC560.pdf
Looks good. It will take some time for me, but I will try it...
Best,
Carlos Lima
BC559B / BC559C
http://www.fairchildsemi.com/ds/BC/BC560.pdf
Looks good. It will take some time for me, but I will try it...
Best,
Carlos Lima
substitute
Well-known member
Two quick calibration questions...
Kam says...
Igor says...
Feed 0dbV or 1V RMS 1 kHz measured between pins 2 and 3 on input XLR with AC voltmeter
should we be using the dbu or dbv calculator?
Also, there's been a couple posts saying to set the ratio to 1:2 while calibrating. This doesn't seem to be an available setting based on the silkscreen on igor/puruscha/dan's cases. What am I missing here?
Thanks!
Kam says...
Igor says...
Feed 0dbV or 1V RMS 1 kHz measured between pins 2 and 3 on input XLR with AC voltmeter
should we be using the dbu or dbv calculator?
Also, there's been a couple posts saying to set the ratio to 1:2 while calibrating. This doesn't seem to be an available setting based on the silkscreen on igor/puruscha/dan's cases. What am I missing here?
Thanks!
substitute
Well-known member
page 14 (this thread), kind of near the bottom.
matta
Well-known member
That has been the rub I think, not knowing how to convert dBu to Volts AC RMS, the calculator that Kambo posted a few posts back is invaluable! I have 3 of the units I built calibrated and the 'ideal' is to to get 0.123 I think, in the 'matched' pair I did I got 0.116 on one and 0.114 on the other... not bad, and they sound great!
Thanks again for the help Kambo, added some much needed clarity to the build!
Cheers
Matt
Thanks again for the help Kambo, added some much needed clarity to the build!
Cheers
Matt
substitute
Well-known member
yeah, I didn't think it was a real make or brake point.
Any one have any insights into the ratio question?
I seem to remember you doing a lot of leg work on the s800 project, so cheers all around!
ultra-alex
Well-known member
finished! ;D
a big THANK YOU to igor, dan (ddt) and frank (frontpanels.de)! and of course to all the other polite and helpful gentlemen in this forum...
cheers, alex
a big THANK YOU to igor, dan (ddt) and frank (frontpanels.de)! and of course to all the other polite and helpful gentlemen in this forum...
cheers, alex
substitute
Well-known member
No kidding Looks great! Do you have igor's meter scale?
haima
Well-known member
beautiful! how does it sound? i'd love to hear some clips (dry / compressed)... thinking about making one of these (even though i have a igor 33609 on the go too... haha)
ultra-alex
Well-known member
haima said:
you shure have to build one. it´s an amazing comp! the hpf is veryvery useful (although i didn´t see the advantage at first). the 2254 seems to react a little smoother (in a good meaning) compared to the 33609. but if you like you can squeeze tracks anyway. different! i love both!
sorry for my poor english/description and thanks for the nice comments. cheers, alex
