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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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 Posted: Sun Feb 17, 2008 1:37 pm Post subject:
Re: To 'C' or not to 'C' |
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| whomper wrote: |
Well, went in to the store today and found a replacement:
BD239C -> BD241C
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You can use it if the beta (hFE, current gain) is high enough.
Guaranteed specs are worse on the 241 than for the 239, so better buy a couple more in case you run int one that's on th elow end of the spec.
Yes.
JH.
Now playing: Mike Oldfield, Five Miles Out
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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23isgood
Joined: Nov 18, 2006
Posts: 236
Location: San Francisco, CA bay area
Audio files: 13
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Mon Feb 18, 2008 3:56 pm Post subject:
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| 23isgood wrote: | Hi, im just wondering if this is the right transformer for this project,
http://www.mouser.com/Search/Refine.aspx?Ntt=*266J16*&N=1323038&Ntx=mode%2bmatchall&Ns=P_SField&OriginalKeyword=266J16&Ntk=Mouser_Wildcards
thanks
pete |
No, you need two windings with 16 ... 18V *each*,
or a center tapped winding with 32V ... 36V *total*.
JH.
Now playing: Leonard Cohen, Various Positions
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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23isgood
Joined: Nov 18, 2006
Posts: 236
Location: San Francisco, CA bay area
Audio files: 13
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| Posted: Mon Feb 18, 2008 9:51 pm Post subject:
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Yikes, well does anyone have a Mouser part number for the transformer we need for this project? Apparently it is a challenge to find the right transformer.
thanks
pete
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue Feb 19, 2008 12:31 am Post subject:
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| 23isgood wrote: | Apparently it is a challenge to find the right transformer.
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Certainly not. 2 x 18V is a very common type.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue Feb 19, 2008 12:47 am Post subject:
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http://www.mouser.com/catalog/633/1866.pdf
Several 2x18V types (described as "36V CT")
The smallest one will do:
http://www.mouser.com/Search/Refine.aspx?Ntt=546-185C36%09
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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23isgood
Joined: Nov 18, 2006
Posts: 236
Location: San Francisco, CA bay area
Audio files: 13
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| Posted: Tue Feb 19, 2008 2:26 pm Post subject:
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Cool thanks. This project requires parts that im not familiar with. I hope I don't drive you guys nuts with my questions, im still trying to find the lamps, lamp socket and relay through Mouser.
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morbank
Joined: Jan 30, 2008
Posts: 58
Location: USA
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morbank
Joined: Jan 30, 2008
Posts: 58
Location: USA
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stegoman
Joined: Oct 05, 2007
Posts: 21
Location: Chatsworth, California, USA
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| Posted: Wed Feb 20, 2008 10:14 pm Post subject:
Re: Lamps, lamp socket and relay. |
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On the same page, Greenweld sells 6v 0.1A bulbs. Would these likely work in place of the 7v 0.1A bulbs called for in the BOM?
It would be great if I could order bulbs and sockets at the same time. And since they are both packages of 10, I could probably split the cost with one or two others here in the USA if there is any interest. |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Wed Feb 20, 2008 11:31 pm Post subject:
Re: Lamps, lamp socket and relay. |
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| stegoman wrote: | | And since they are both packages of 10, I could probably split the cost with one or two others here in the USA if there is any interest. |
I think you might want to have some spares if they are that difficult for you to get...
Even I have six spares, and I can get the real 7V 100mA easily enough, at the moment. But I don't want to have to search again when the bulbs start dying.
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Thu Feb 21, 2008 12:24 am Post subject:
Re: Lamps, lamp socket and relay. |
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| stegoman wrote: |
On the same page, Greenweld sells 6v 0.1A bulbs. Would these likely work in place of the 7v 0.1A bulbs called for in the BOM?
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The Lamp voltage is quite crucial for the sweep waveform of this phaser. Part of the control shape is _formed_ in these incandescent lamps!
There is the possibility (untested!) to use more common 6.3V lamps and connect a 1N4002 diode in series: The diode's voltage drop of approx. 0.7V should add up to 7V with the lamp's 6.3V . (There are two wire bridges to be replaced with diodes: two diodes for two lamps.)
Fine tuning can be done with the 1k trimmer afterwards. But this really only allows *fine* funing. Th3 6.3V lamps should have similar power rating: Something in the range of 70mA to 150mA I'd say, for experiments.
But let me say it again: This is untested!
You could also experiment with your 6V lamps and put 3 diodes in series with them ("one and a half" diode per lamp  ).
It's pobably really woth experimenting with different lamps.
If you want a straight path to the original sound, 7V lamps are the best way, of course.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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stegoman
Joined: Oct 05, 2007
Posts: 21
Location: Chatsworth, California, USA
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| Posted: Thu Feb 21, 2008 10:47 am Post subject:
Re: Lamps, lamp socket and relay. |
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| jhaible wrote: | | stegoman wrote: |
On the same page, Greenweld sells 6v 0.1A bulbs. Would these likely work in place of the 7v 0.1A bulbs called for in the BOM?
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The Lamp voltage is quite crucial for the sweep waveform of this phaser. Part of the control shape is _formed_ in these incandescent lamps!
There is the possibility (untested!) to use more common 6.3V lamps and connect a 1N4002 diode in series: The diode's voltage drop of approx. 0.7V should add up to 7V with the lamp's 6.3V . (There are two wire bridges to be replaced with diodes: two diodes for two lamps.)
Fine tuning can be done with the 1k trimmer afterwards. But this really only allows *fine* funing. Th3 6.3V lamps should have similar power rating: Something in the range of 70mA to 150mA I'd say, for experiments.
But let me say it again: This is untested!
You could also experiment with your 6V lamps and put 3 diodes in series with them ("one and a half" diode per lamp ).
It's probably really worth experimenting with different lamps.
If you want a straight path to the original sound, 7V lamps are the best way, of course.
JH. |
Given the key that the bulbs are part of the waveform creation, has anyone found alternate sources for bulbs (or sockets)? Especially in the USA??? Who is the manufacturer of the Bulbs? Sockets? With company names and company part #'s, it will be much easier to search for alternate sources.
Thanks to all for any information! |
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vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
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| Posted: Thu Feb 21, 2008 11:15 am Post subject:
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| How many people in the USA are building this phaser? Maybe it's time to look at a group purchase of bulbs and sockets. |
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stegoman
Joined: Oct 05, 2007
Posts: 21
Location: Chatsworth, California, USA
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| Posted: Thu Feb 21, 2008 11:22 am Post subject:
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| vtl5c3 wrote: | | How many people in the USA are building this phaser? Maybe it's time to look at a group purchase of bulbs and sockets. |
Count me in. I want a couple of extra bulbs so that, when these finally burn out, I don't have to look all over to get replacements! (Or worse, find out they don't exist 10-15 years from now!) |
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germaniac
Joined: Aug 04, 2006
Posts: 200
Location: California
Audio files: 7
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| Posted: Thu Feb 21, 2008 12:11 pm Post subject:
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I'd be in for a group-buy of bulbs, since it's overcast here in LA.  |
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23isgood
Joined: Nov 18, 2006
Posts: 236
Location: San Francisco, CA bay area
Audio files: 13
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| Posted: Thu Feb 21, 2008 1:32 pm Post subject:
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Im in on a group buy. Anyone got a Mouser part number for the fuse holder?
How about the relay? Im trying to get as many parts as I can through Mouser, before having to get parts through another supplier.
pete
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gavgomad
Joined: Jan 29, 2006
Posts: 69
Location: Canada
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| Posted: Thu Feb 21, 2008 1:37 pm Post subject:
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I'd be in on a group buy as well all.... Dunno if there are any fellow canucks out there, but would those of us north of the border be welcome?
Gavin. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Thu Feb 21, 2008 2:57 pm Post subject:
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I'd like also like to get in on any group buys on rare or expensive components used here.
I haven't bought any parts for this board yet. I'm sort waiting/hoping for someone to document the project a little more (as Bill and Will did with with the Tau Pipe--which helped me to get thru that build). |
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numbernone
Joined: Aug 16, 2006
Posts: 477
Location: new york city
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| Posted: Thu Feb 21, 2008 5:23 pm Post subject:
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| I would also be interested in any group buys for the more unusual parts. |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Fri Feb 22, 2008 4:04 pm Post subject:
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Here's some information I got from Paolo (from Italy):
I have no idea how close that LDR is to the one I'm using - just wanted to pass the information on.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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ziwzih
Joined: Feb 01, 2008
Posts: 2
Location: Los Angeles
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Luka
Joined: Jun 29, 2007
Posts: 1003
Location: Melb.
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jaidee
Joined: Oct 28, 2007
Posts: 44
Location: Newcastle upon Tyne, UK
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| Posted: Sat Feb 23, 2008 12:45 pm Post subject:
5W resistor |
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How critical is the value of the 5W resistor?
120R is not readily available in the UK.
If it is possible to substitute a different value, which is better 100R or 150%?
Incidentally, RS Components do a nice PCB mounting MES E10 lamp holder with pins to go straight into the PCB rather than tags, Part no.171-2580, very modest cost but there is a minumum order number of 10. |
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