Help my first build isnt working!

[DBDbadreligion]

ok well i grounded the output sleeve to the input sleeve.
i dont know the output jack tip would be geting grounded, because when it is in bypass the tip gets sound but when turned on it doesnt.   do you tink maybe grounding the volume pots ground to the input sleeve instead of the PC board might help?

[petemoore]

do you tink maybe grounding the volume pots ground to the input sleeve instead of the PC board might help?
  Mostly using a metal box and good conduction between the two jack sleeves, one ground wire can be run to the board, all other grounds can be made from there.
  I think theres mostly lots of leeway on exactly how grounds are wired, try to keep it neat.
  But having on your board..exactly what the schematic shows [all ground points grounded, no stray grounds] is what is needed.

[DBDbadreligion]

well then technically my pedal should work, because i have everything grounded correctly.  the only difference is that im not using a metal enclosure, mine is plastic and that's why i have the wire going from the input to the ground.

[DBDbadreligion]

bump

[gaussmarkov]

hi,

i'm glad you got the audio probe working.  that will be a big help.  let's try to get those voltage readings.

set your meter to the setting circled in red:



try reading your battery first.  put the black probe on the negative (-) terminal and the red probe on the positive (+) terminal of a fresh 9V battery.  at least one of these is marked on the side of the 9V battery.  the scale that you should read is shown below, along with where the 9V mark is:



if that doesn't work, then there is something wrong with your multimeter.  if it does, then read the voltages on the pins of the two ICs.  here is a markup of the layout that you are using with the pin numbers marked in red.  we will need a voltage for each pin.  to read the voltage, keep your black probe on the negative terminal of the battery and touch each pin with your red probe.  take your time and read each pin as carefully as you can.

[DBDbadreligion]

hi,

i'm glad you got the audio probe working.  that will be a big help.  let's try to get those voltage readings.

set your meter to the setting circled in red:



try reading your battery first.  put the black probe on the negative (-) terminal and the red probe on the positive (+) terminal of a fresh 9V battery.  at least one of these is marked on the side of the 9V battery.  the scale that you should read is shown below, along with where the 9V mark is:



if that doesn't work, then there is something wrong with your multimeter.  if it does, then read the voltages on the pins of the two ICs.  here is a markup of the layout that you are using with the pin numbers marked in red.  we will need a voltage for each pin.  to read the voltage, keep your black probe on the negative terminal of the battery and touch each pin with your red probe.  take your time and read each pin as carefully as you can.

alright will try to do later tonight or tomorrow.

[DBDbadreligion]

alright so here are the DC voltages.

just the 9V battery is 9.5 V.

IC-1 and 2 ended up being the same.

Pin 1 - 9
Pin 2 - 9
Pin 3 - 4
Pin 4 - 9
Pin 5 - 9
Pin 6 - 8.5
Pin 7 - 8.5
Pin 8 - 9.5

all measurements in volts

[petemoore]

Pin 1 - 9
Pin 2 - 9
Pin 3 - 4
Pin 4 - 9 [should be ground, the others may 'follow suit' toward ground.
Pin 5 - 9
Pin 6 - 8.5
Pin 7 - 8.5
Pin 8 - 9.5
  Connect pin 4 to ground, test for Non continuity between battery clip +/- [so you don't short your battery, a good 'just in case' ritual..] then power and try again.

[DBDbadreligion]

so pin 4 should not be getting any measurements?

[gaussmarkov]

so pin 4 should not be getting any measurements?

pin 4 should read 0V, which is still a measurement 

good work!  you are making progress.

i looked at some of your photos.  i am concerned that you may have some wires touching that
should not because they are crossing each other.  notice that in the original layout none of the
light blue lines cross.  it is fine to space things out more, but you make things much harder for
yourself at this stage when you don't follow the layout more closely.

pin 3 is at approximately 4V.  this shows that you successfully got that part of the circuit made.
that is good news.

the problem with pin 4 is that somehow you have hooked up the ground net to the 9V net.
this could be a mistake in putting the connections together or that one wire is accidentally
touching another.  it is hard to tell from the photos.

i have highlighted the ground net in green on this version of the layout you have been using:



all of the things connected to this should read 0V including one lead of R3, one lead of R4,  one lead
of C2, the #1 lug of the volume pot, and (of course) pin 4 of both ICs.  look along your version of
this set of connections (or net) and see if you can find a place where there is an extra connection that
could be giving the 9V reading.  when you find it, remove that connection.  then make sure all of
your IC readings are the same except for pin 4.

[petemoore]

  Yes, see if pin 4 is connected, and find out where, it needs to be at ground voltage, 0.0v.
  disconnected from everything except all other grounds.
  I didn't look at the pictures but nothing can be touching that isn't marked as connected on the schematic, that could be troublesome and difficult.

[DBDbadreligion]

alright i will get on that ASAP

[DBDbadreligion]

ok well i tried re-grounding pin 4 and both of them still got readings of around 9V.  so i decided to unsolder everything that was touching the 4 th pin on IC-2.  that way i could just measure Pin 4 by its self.  Pin 4 still got a reading of around 9V, what could be wrong with it?  now i dont know what to do.

[petemoore]

ok well i tried re-grounding pin 4 and both of them still got readings of around 9V.
  This is a neg gnd circuit. 'if pin4 is at 9v...hmmm
  so i decided to unsolder everything that was touching the 4 th pin on IC-2.  that way i could just measure Pin 4 by its self.  Pin 4 still got a reading of around 9V, what could be wrong with it?  now i dont know what to do.
  I can't see for certain that the readings gathered can be trusted.
  I skipped the question:
  Did you connect a voltage divider [two same value resistors series across the supply rails, ie battery + and - terminals]?
  Measure from ground to ground with a DMM and you'll get a O.0V reading. tested in beep mode it'll beep indicating a connection there.
  Measure voltage again 'in the middle' where the two = value resistors connect in your V divider, the DMM will read 1/2v or 4.5 of 9v...
  Measure across the rails [battery _/+] and you'll read the battery voltage.
  by completing these simple tests you can verify that your meter is 'in ratio' and close to the mark..starting with a fresh battery to measure, your meter should read within say 10% of the exact voltage of the battery, and if you measure and match the resistance of the two V divider R's, the 1/2v measurement should be very close to exactly 1/2v.
  If pin 4 has a connection to ground, it doesn't matter what else is connected or going on, from ground there will be exactly a 0.0v difference measured from ground..even if it's connected to 9v also, this condition is a 'direct short' something that will fry your battery, perhaps something else, I always test that there are no direct shorts across the power rails after messing with/before powering a circuit.

[DBDbadreligion]

alright explain this voltage divider to me, i dont quite understand it.

[DBDbadreligion]

bump

[aron]

http://en.wikipedia.org/wiki/Voltage_divider

[DBDbadreligion]

ok i get it now

[gaussmarkov]

all of the things connected to this should read 0V including one lead of R3, one lead of R4,  one lead
of C2, the #1 lug of the volume pot, and (of course) pin 4 of both ICs.  look along your version of
this set of connections (or net) and see if you can find a place where there is an extra connection that
could be giving the 9V reading.  when you find it, remove that connection.  then make sure all of
your IC readings are the same except for pin 4.

even though you are having trouble with pin 4, i suggest that you should also check whether the other items listed
above that are connected to ground are in fact at 0V.

[DBDbadreligion]

alright.