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Spratty
Joined: Oct 08, 2007
Posts: 43
Location: Australia
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 Posted: Sat May 03, 2008 6:16 am Post subject:
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Helps to know we're talking about a stomp-switch here. Cheers. I'm still a bit new to diy in a roundabout way, so some patience and assistance is certainly appreciated 
Locally I've only seen DPDT's like that one. Would an SPST be ok for this? Since it's just on-off we're looking for here? I think I might have one around here somewhere.....
Spratty  |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Sat May 03, 2008 7:20 am Post subject:
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| Spratty wrote: | | Helps to know we're talking about a stomp-switch here. |
Mainly because I have initially built it as an oversized stompbox.
| Quote: | | Would an SPST be ok for this? |
Yes.
JH.
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"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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numbernone
Joined: Aug 16, 2006
Posts: 477
Location: new york city
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| Posted: Sun May 25, 2008 9:32 am Post subject:
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Not much activity on this topic for a while now, must be lots of sick phasors phasing all over the place out there...
I am now finding myself with the time to begin work on the Compact A. Most all parts are in order, except for a few of the exotic things so rare in what I have already built.
Can anyone report success with the 6.3v lamps?? I would really like to avoid overseas costs and wait by going with something I can grasp easily onthis side of the ocean. But I also want to build exactly what Juergen envisioned and birthed for us all.
Expect more questions from me as I begin on this baby and the Tau, which is already so well documented that I will probably be fine. |
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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 May 27, 2008 5:02 pm Post subject:
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I have quite a few 7v lamps. If you want some shoot me a msg. I'm in California.
pete
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue May 27, 2008 11:45 pm Post subject:
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| numbernone wrote: | Not much activity on this topic for a while now, must be lots of sick phasors phasing all over the place out there...
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I've been wondering, too ...
I sold quite a number of these boards, and I hope many of them have been turned into working phasers by now (and not collecting dust half-finished and waiting for troubleshooting) ?!
If you've built that thing, and are proud of what you've built, and feel like doing so, take a picture and put it in the "photos ..." thread. And some sound samples, too, if you like.
(I'm really curious about the different enclosure solutions you've found, with the size of the lamps and all. Still marvelling at Riku's 1U rackmount version!)
http://electro-music.com/forum/post-187164.html#187164
Also, if you run into any trouble building this, don't hesitate to write about it here in the forum. It may be something that others have run into before, and you can help each other with hints and tips and tricks.
JH.
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"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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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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| Posted: Wed May 28, 2008 1:38 am Post subject:
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| jhaible wrote: |
I sold quite a number of these boards, and I hope many of them have been turned into working phasers by now (and not collecting dust half-finished and waiting for troubleshooting) ?!
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I've got this pencilled in for completion in about 2012  
But it will get built! Eventually 
_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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norman phay
Joined: Jun 29, 2007
Posts: 176
Location: North-East England
Audio files: 1
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| Posted: Wed May 28, 2008 6:07 am Post subject:
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I've got mine all lined up, each is 95% finished. What's holding me up is that times are pretty thin this year in retail in th'UK and consequently I haven't any spare cash to pick up the remaining components I need. Pathetic! I know.
One thing that would be useful to know - a source for the 4 control pots specified? I couldn't find them when I looked.
I'll be building them into eddystone metal cases, because it's called "kraut rock phaser" I was planning on doing a german-themed paint job, either lozenge pattern camouflage like a WW1 Luftstreitkräfte biplane or splinter pattern, like an F104G. Probably the latter. Or maybe silver/blue swirls like the cover of "Phaedra", I dunno I have to get them finished first. I do have a working Solina Ensemble permanently attached to the output of my Lambda now!
Last edited by norman phay on Wed May 28, 2008 6:11 am; edited 1 time in total |
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norman phay
Joined: Jun 29, 2007
Posts: 176
Location: North-East England
Audio files: 1
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| Posted: Wed May 28, 2008 6:08 am Post subject:
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| F104G style also a tribute to one of my favourite albums, Robert Calvert's "Captain Lockheed and the Starfighters" |
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24670
Location: The Netherlands, Enschede
Audio files: 330
G2 patch files: 320
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| Posted: Wed May 28, 2008 9:43 am Post subject:
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| Norman Phay wrote: | | "Captain Lockheed and the Starfighters" |
Hey that's a long time ago I saw those words combined ... I even forgot the music .. which doesn't happen too often ... ah youtube has it 
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Jan
also .. could someone please turn down the thermostat a bit.
9 3 4 .. erm .. not 13 then? .. hmm, ah eight! .. yeah yeah as in 8647 .. 47 is an 88 .. pwew .. numbles! |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed May 28, 2008 2:07 pm Post subject:
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| Norman Phay wrote: |
One thing that would be useful to know - a source for the 4 control pots specified? I couldn't find them when I looked.
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I used to buy them at www.rs-components.de .
But they seem to phase them out.
But the good news is that www.reichelt.de now start to offer them, and cheaper than RS did!
I think Farnell has them, too, if a little overpriced.
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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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed May 28, 2008 2:12 pm Post subject:
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Oh, Starfighters. I remember them from my youth. They always came down here in Germany - early case EMI problems, I think.
But it was a Phantom, not a Starfighter, that crashed into the woods where my Father and Brother had camped just 2 days before.
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: Sun Jun 01, 2008 6:33 pm Post subject:
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Wired up my Phaser today. Everything seems to be working except, for the LFO is not oscillating. Im not sure if I wired up the OSC period pot correctly. Its not doing anything when I turn it. Are you supposed to wire the CW leg to the middle leg on the pot? I tried that but its still not working.
I also notice that r18 (low lim) doesn't do anything when I turn it either. I did not wire up a switch to "Manual" yet, but I tried to short the three pins out by placing a resistor lead across them. Still no LFO action. Am I missing something?
pete
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Sun Jun 01, 2008 11:01 pm Post subject:
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| 23isgood wrote: | | Wired up my Phaser today. Everything seems to be working except, for the LFO is not oscillating. Im not sure if I wired up the OSC period pot correctly. Its not doing anything when I turn it. Are you supposed to wire the CW leg to the middle leg on the pot? |
Yes, the middle leg of the pot has to be connected to the CW end, but you can do this directly on the PCB, using a wire bridge at two of the 3 holes directly near the pot.
| Quote: | | I also notice that r18 (low lim) doesn't do anything when I turn it either. |
This will only have an effect with a pedal connected.
| Quote: | I did not wire up a switch to "Manual" yet, but I tried to short the three pins out by placing a resistor lead across them. Still no LFO action. Am I missing something?
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You need to connect the middle and right pin of the "Amount" connector.
(The schematics show a normalized connction via a TRS jack here - if you don't use that jack, connect the two pins.)
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: Mon Jun 02, 2008 5:50 pm Post subject:
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Oh yea I connected the pins of the "Amount" connector. Is there something I should check to see why the LFO is not working?
thanks
pete
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Mon Jun 02, 2008 10:56 pm Post subject:
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| 23isgood wrote: | Oh yea I connected the pins of the "Amount" connector. Is there something I should check to see why the LFO is not working?
thanks
pete |
Does the LFO core not work, or is the signal not passed on to the lamp driver?
You should have a triangle wave at pin 6 of U4 and a square wave at pin 6 of U3.
If you don't have periodic waveforms here - at which voltage are they stuck?
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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numbernone
Joined: Aug 16, 2006
Posts: 477
Location: new york city
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| Posted: Tue Jun 03, 2008 8:41 am Post subject:
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Finally began stuffing the PCB last night. Great fun as I really prefer values in place of component numbers, so much more focus on the board than some BOM.
And so the questions begin:
My lamp sockets have a longer foot print than the big pads on the board. Is it best to reshape the leads to fit thru the holes, or was this even the intention? Should they be lashed down with bent wires or leads passing thru the socket and PCB? It is one of the things I cant seem to see in any of the completed photos that folks have posted.
It is still a ways off but, can anyone suggest a nice holder/bezel for the lamp that is mounted on the faceplate??
More to come as I get a bit deeper. |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue Jun 03, 2008 11:27 am Post subject:
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| numbernone wrote: | Finally began stuffing the PCB last night. Great fun as I really prefer values in place of component numbers, so much more focus on the board than some BOM.
And so the questions begin:
My lamp sockets have a longer foot print than the big pads on the board. Is it best to reshape the leads to fit thru the holes, or was this even the intention? Should they be lashed down with bent wires or leads passing thru the socket and PCB? It is one of the things I cant seem to see in any of the completed photos that folks have posted. |
Whatever gives a decent mechanical stability, and connects the two pins to the PCB pads electrically, will be ok.
The sockets from Reichelt fit into the footprint nicely (of course the leads have to be shortened on the solder side of the board as any other component's). The other extreme would be to solder in the lamps (!) directly with two pieces of 1mm tinned wire. Anything in between, like soldering wires to a socket that doesn't fit, should work as well.
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 Jun 03, 2008 9:49 pm Post subject:
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It seems like the LFO core is not working. I did not see any waveforms on the pins. Here are the voltages I got,
u3 pin 6 = 14.0v
u4 pin 6 = 2.08v
The "phase/amplitude, feedback, and modulation" pots are working, but the "OSC period" pot is not working. When I adjust the "phase/amplitude" pot with white noise going into the input, I can hear nice phasing. There is just no LFO.
pete
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed Jun 04, 2008 12:29 am Post subject:
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| 23isgood wrote: | It seems like the LFO core is not working. I did not see any waveforms on the pins. Here are the voltages I got,
u3 pin 6 = 14.0v
u4 pin 6 = 2.08v
The "phase/amplitude, feedback, and modulation" pots are working, but the "OSC period" pot is not working. When I adjust the "phase/amplitude" pot with white noise going into the input, I can hear nice phasing. There is just no LFO.
pete |
So the LFO core is stuck. Can't be anything serious, as it's just a variation of a very simple tri/square LFO.
It's single supply - that means pin 2 of U3 should be at half the positive supply voltage (about 7.5V - please check this voltage!)
That means, with 2.08V the integrator (u4 pin 6) is practically on it's lower rail (GND + saturation voltage). Strange enough, the non-inverting schmitt trigger (u3) is on the +upper* rail, i.e. switched "high" instead of "low".
You didn't substitute that 741 for an opamp that shows phase reversal, did you?!
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: Thu Jun 05, 2008 4:39 pm Post subject:
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Im using two 741's for the LFO section. I will test the voltage of pin 2 at U3 later tonight. I will also try a different 741 to see if I have a bad op amp in there now.
thanks for the help,
pete
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23isgood
Joined: Nov 18, 2006
Posts: 236
Location: San Francisco, CA bay area
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| Posted: Thu Jun 05, 2008 7:48 pm Post subject:
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I get 2.48v at pin 2 of U3. I checked the voltage at pins 7 and its 14.48v. I tried two different 741's and there was no difference.
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
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| Posted: Fri Jun 06, 2008 12:04 am Post subject:
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| 23isgood wrote: | | I get 2.48v at pin 2 of U3. |
Ah - we're getting closer!
So the fault isn't in the LFO, but in the reference voltage for the LFO, U5A.
Please measure the voltage at pins 1, 2 and 3 of U5 (the 1458).
They should all be the same, and about 7.8V.
JH.
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"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: Fri Jun 06, 2008 8:06 am Post subject:
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Ok here's what I got,
pins 1 and 2 = 2.51v
pin 3 = 7.68v
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Fri Jun 06, 2008 8:53 am Post subject:
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| 23isgood wrote: | Ok here's what I got,
pins 1 and 2 = 2.51v
pin 3 = 7.68v |
All right - so the fault lies in U5.
U5a is a simple unity gain buffer - output should be equal to input.
I know it sounds like a stupid question - but do you have a 1458 in there?
(It's the only dual opamp on the board, the only one that's not a 741 ...)
Or one of the pins isn't soldered?
Or the output shortened to a low voltage? Does U5 get hot?
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
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| Posted: Sat Jun 07, 2008 3:39 pm Post subject:
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There is a 1458 in there. Its not getting hot. I tried a different 1458 and there was no difference. I checked all the pins and everything is fine. Could I have an incorrect cap or resistor installed somewhere? Here is a pic of my temporary setup.
pete
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