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Hey!
i am new at soldering and already moved onto my second pedal because my first pedal (failed)
Stil im trying to fix that first pedal because its a learning experiance.
I have a problem that i cannot find a solution on google so i thought id share it here!
When i started my first Phaser clone kit i grabbed a simple soldering iron from my toolkit that i had around.
(That toolkit was aimed for computer-building)
Later i bought a new soldering station + tin and basicly everything from a known brand at a local store.
So what i found out (see picture) is that all the joints are not *shiny* and many of them could be bad i figured?
So i when about to go clean it up… but here comes the issue:
i cannot desolder any of it…. it melts yes!
But thats it!My new soldering tin gets sucked right away when i used desoldering tape.
But this old tin i used on this PCB doesnt, it realy is very stubborn.
Any thoughts or questions would be realy appriciated =)
Just add some new solder to the joints you think are dry
What exactly is the pedal doing or not doing it may be something else causing your fault my advice is to post nice clear pictures of both sides of the pcb and wiring to footswitch DC jack and in and out jacks so that we can clearly see components and trace the wiring also post links to the build document and what the circuit is
Your solder joints look ok to me
Was the first solder you used unleaded that has a higher melting point than leaded solder and doesn’t flow as quickly
Oh that is very kind of you =)
Let me post a few pictures i have:
ps. i just finished wiring my second build -> a rat pedal (and this one is not working either)
Im gessing im making some vital beginner mistakes, but who knows ?Very difficult to find the build document on the musikding site post a link to that
What voltage do you get at the +9v and gnd pads
Could you post a close up of your DC jack wiring
Do you get bypass signal
—Very difficult to find the build document on the musikding site post a link to that—
https://www.musikding.de/docs/musikding/phaser/phasev2schalt.pdf</p>
https://www.musikding.de/docs/basics/installationguideV001_en.pdf</p>—What voltage do you get at the +9v and gnd pads—
i dont know how to measure that, im stil learning how to use the multimeter.</p>
But i can tell you the pedal turns on (LED) bypass works and i also get Tone, but its not phasing in and out like a phaser should. turning the pots doesnt help either, so i already bought new pots and replaced them, i seem to get a little better tone but stil no phasing in and out. Only tone.—Could you post a close up of your DC jack wiring—
…wil edit photo here once its uploaded…—Do you get bypass signal—
YesDid you adjust the trimmer to try to get phasing
To take voltages with your meter set it to 20 vdc place your black probe on the ground pad and red probe to the +9v pad
no , i wouldnt dare touching anything i have no knowledge about….i can sure try =) !
sorry the *edit* button went missing….
I wanted to add: That i tried turning the trimmer and when i do , it is phasing when turning the trimmer.
But without it is not.
Set the speed knob to half way depth up full
Set the trimmer to just before half way and turn it in very small amounts until you hear phasing
You have to set the trimmer to get phasing it is a very small range on the trimmer so just turn it a little at a time
it only phases when i move the trimmer up and down with a screwdriver. when i stop the sound also stops phasing.
I can litterly tune it at every pitch of the phasing tone. And it just stays in tune making a nice tone.
It is like the trimmer is acting as a manual phasing knob
Sounds like it may be your transistors what type of FET transistors are you using 2N5952 or 2N5457
Check what voltage you get on both sides of your zener diode D1 simply place your meter black probe on a ground pad and touch both sides of the zener diode with the red probe with your meter set to 20 DC voltage the V with a line and dotted line under it (see below)
Also check you get a pulsing changing voltage at IC1 pin 7 pin numbers go like this again meter set for 20VDC black probe to ground red to pin 7
In this kit they included the 2n5457
the orientation is different then the 2n5952 if i recall correctly ?
i wil get my multimeter and go testing what you suggested!
edit: i get 0.00 at everything i assume i need to power the circuit with 9v dc and then read?
(i realy am new , but i like to be thorough and double check before doing something)
Multimeter results:
ic2: 450
ic3 450
ic1 893 (strange this one changed to 1.38 on second test
when i turn the pedal on there are no changes in voltage on any of the IC
d1 450 on the size with the indication stripe and 000 on the oposite side
Yes they look to be orientated correctly and you do need to power the circuit to take voltage readings
Your voltage readings don’t look correct you’ve definitely got it on DC voltage not AC?
Are they 4.50 where you say 450 etc
You’d need to specify the pin numbers
E.g.
IC1
1.
2.
3.
4.
5.
6.
7.
8.
We’re trying to establish if your LFO is working IC1 pins 5, 6 and 7
Also take T1, 2, 3 and 4 voltages left to right pins are G (gate), S (source), D (drain) as written on the pcb list them like that e.g.
T1
G 2.2V
S 5V
D 5V
etc for all 4
Thank you for explaining this, here are my new readings:
ic1
1: 4.51
2: 4.51
3: 3.04
4: 0.00
5: 9.54
6: 8.92
7: 1.19
8: 1.05
ic2
1: 4.51
2: 4.51
3: 4.50
4: 0.00
5: 9.54
6: 4.51
7: 4.51
8: 4.50
ic3
1: 4.51
2: 4.51
3: 4.50
4: 0.00
5: 9.54
6: 4.50
7: 5.01
8: 4.50
T1
g: 1.90
s: 4.50
d: 4.51
T3
g: 1.90
S: 4.50
d: 4.50
T2
g:1.90
s:4.50
d;4.50
T4
g: 1.90
s; 4.51
d; 4.51
They look ok I think you’ve probably got pins 5 to 8 The wrong way round if you refer to the IC pin numbering image you go left of dot or notch is pin 1 down to 4 then 5 up to 8 in a U shape
Assuming your power in is 9.54v then that’s what it is
Take the voltage again on IC1 pin 7 hold it on the pin to see if it varies you should also get varying voltage on the rate potentiometer
Also turning the trimmer try to set the voltage on T1 G (gate) pin to 2.2v so turn it a little check voltage on the gate until it’s around 2v if you turn it and it lowers the voltage you know you have to turn it the other way to increase voltage
We know the phasing works when you turn the trimmer so it’s just fine tuning
T1 to 4 work as variable resistors to shift the phase stages it’s just a case of trying to find out whether it’s due to them or the LFO not working correctly or something else of course
So all we’re doing is checking parts of the circuit before we do anything else
Just for your own interest if you look at the schematic it’s like join the dots you can see for example D1 the 5V1 zener connects to T1 S (source) D1 ideally puts out close to 5.1v but will usually have a voltage drop across it typically 0.6v for a silicon diode so that tells us 4.50 is about right you’d then see what that connects to which is T1 source so you’d expect around 4.50 there too
You can see all the transistor source pins are connected so again should all be around the same voltage
That’s what we’re basically doing
Your IC voltages on the whole look ok, IC1 is the LFO (low frequency oscillator) that basically oscillates or modulates the signal so it should vary with the rate control on its inputs pins 5 and 6 and output pin 7
Yea u are right i counted pin 5 to 8 the wrong way around.
but i get no varying voltages on pin 7 from ic1 8.91 without any change, neither for the rate pot, al 3 pins stay the same number.
i wil try the rest later ? thanks again for explaining so much i realy approciate it.
Sounds like your LFO isn’t working
Make sure the metal back of your pots aren’t touching anything on the pcb
Try taking IC1 out of it’s socket and see if you get fluctuating voltage on pins 5 and 6 you can put your black probe in pin 4 socket (ground) then red into pin 5 and 6 socket and turn the rate pot see if it changes
Set the deep pot to maximum
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