Help my first build isnt working!

[DBDbadreligion]

it is the B.Blender.
it bypasses and a clean signal goes through when it is off, but when it is on the volume knob goes buzzzzz when i turn it up.
http://s5.photobucket.com/albums/y178/DBDbadreligion/?action=view&current=B-1.jpg
that's the schematic i went from, is it wired correctly?

thanks,  nick

[rubix cube]

I can't really tell how your input jack is connecting the rest of the circuit to GND from the picture.   (?)

Buzzing has meant something isn't connected to ground on many occassions for me, so that'd be the first thing I'd check.

Then probably the voltages around the board with a multimeter.  Good luck!

[DBDbadreligion]

the input is connected from the tip of the input to the left-middle row lug

[rubix cube]

Okay! My brain just told me it was a red wire so it was 9V! Have you got a link to the schematic?

[DBDbadreligion]

it's the b. blender,
http://gaussmarkov.net/layouts/bblender/schem.png
that's the schematic,

here's the webpage i got that from, http://gaussmarkov.net/index.php?page=layouts#bblender

[DBDbadreligion]

i also want to mention, that i grounded all the grounds to a screw that i screwed in the enclosure.  the aluminum lid of the enclosure would not let solder stick to it, neither the pots would.  so i may have a ground issue.

[DBDbadreligion]

and also the led is working, so i dont think it is a 9v error.

[DBDbadreligion]

i just checked the 9v, with a voltmeter.  it's getting over +8.  and all the IC's are getting power.

[DBDbadreligion]

on the IC's the 3rd pin is not getting a reading on either of the IC's.

[DBDbadreligion]

bump....

[rockgardenlove]

Er, get a schematic, and recheck all the switching, board wiring, and stuff like that.

[gaussmarkov]

in order to help you debug your circuit, we will need some information from you.  the forum has developed a method for this and it is described on the Debugging Page.  basically, we will need voltage readings on all of the pins of your ICs, 1 through 8, and we need you to build an audio probe and to trace the audio signal through your build.  but don't take my summary as the whole story--read the whole Debugging Page and follow the instructions on reporting your findings.  once you have done that, i am sure that we can make some progress on your build.  you chose a good one for your first.

all the best, gm

[DBDbadreligion]

alright kool, i will get into to all of that tomorrow.

[ambulancevoice]

can you take a picture of the pcb board (both sides)
and check that all the electrolytic caps are the right way around

[mattpocket]

i also want to mention, that i grounded all the grounds to a screw that i screwed in the enclosure.  the aluminum lid of the enclosure would not let solder stick to it, neither the pots would.  so i may have a ground issue.

Did you connect the sleeve of the input jack to sleeve of the output jack?

For ground, we normally send all the grounds to the input jack sleeve, and then connect the input jack sleeve to the output jack sleeve. If you are using open metal jacks, and a metal enclosure, then you wont need to connect the input and output sleeve together, as this connection will be made through the enclosure.

I've never heard of anyone doing it with a screw into the enclosure, although I understand your logic... Also, if you ground something twice, sometimes that can cause problems. I.e. having a connection through the enclosure between input/output jacks, and also having all the grounds connected to the enclosure. Sometimes, you forget that the connection is made without wires.

Hope some of that helps. Look at tonepad's off board wiring diagram for grounding techniques as described above.

Matt

[rubix cube]

Are you getting around 4.5V at the junction of R2 and R3?

[DBDbadreligion]

i also want to mention, that i grounded all the grounds to a screw that i screwed in the enclosure.  the aluminum lid of the enclosure would not let solder stick to it, neither the pots would.  so i may have a ground issue.

Did you connect the sleeve of the input jack to sleeve of the output jack?

For ground, we normally send all the grounds to the input jack sleeve, and then connect the input jack sleeve to the output jack sleeve. If you are using open metal jacks, and a metal enclosure, then you wont need to connect the input and output sleeve together, as this connection will be made through the enclosure.

I've never heard of anyone doing it with a screw into the enclosure, although I understand your logic... Also, if you ground something twice, sometimes that can cause problems. I.e. having a connection through the enclosure between input/output jacks, and also having all the grounds connected to the enclosure. Sometimes, you forget that the connection is made without wires.

Hope some of that helps. Look at tonepad's off board wiring diagram for grounding techniques as described above.

Matt

ok i will try this, i have not grounded it like that i just put all the grounds on the screw because i dont have a metal enclosure.

[mattpocket]

If you dont have a metal enclosure, then connect all the grounds to the input sleeve and then connect the sleeve of the input jack to the sleeve of the output jack.

Matt

[DBDbadreligion]

alright cool, could this possibly fix it?

[GibsonGM]

Step 1 - please post all your voltages like in the Debugging Page 

While you're in there doing that, test that the grounding screw you're using does in fact make electrical contact with the enclosure and ground (battery - terminal) when a plug is inserted into the input jack.  Use a DMM, no battery, patch cord plugged into input, and check from that screw to the - terminal of the battery clip (the 'male' part).  You should get a beep on the continuity setting.  Sometimes the contact isn't good, which will do what you're describing...