I finally built my first stompbox but there is a problem,
when I plug it in and I turn it on there is no sound...
When its off I can hear my clean from my guitar.
I upload some photos so you can see what is the problem..
Another two photos.
Also when I turn it on the two diodes D3 and D4 doesn't light
instead the LED when I turn on the footswitch it works.
Sorry for my bad english and description.
Aslo I took the multi-meter and I noticed that the IN is grounded is that correct?
Run a wire from the input ground (sleeve) to the output sleeve. When unboxed the output needs grounded. When boxed your enclosure grounds it for you.
And your clipping LED's are probably working fine...you really have to crank it and dig into the strings to get the LED's going on this circuit.
Thanx mate I will try it
Hope it works.........
I just did it and it doesnt work
I connect them like this as you said,
Check the photo.
Am I wright?
Yes that's correct....if you have a digital multimeter post some voltages at the IC pins and transistors.
ok man wait 15 minutes
At the Ic pins its 4.48 Volt at the transistors I dont have anything....
4.8v at all eight pins? No voltage at the transistors is no good. Do you have an audio probe? I would recommend making one of these ( http://www.madbeanpedals.com/forum/index.php?topic=1140.0 ) You get the audio probe and can test your circuit before hooking up a 3PDT and jacks.
If you have one start checking the circuit and see where you loose signal.
I had 4.8V on the 1-5 and on 4-8 so it is 9.6V if we sum them up.
What do you think is the issue??
Do you have any idea?
You should be reading 9v on pin8, 0v on pin4, 4.5v on pins 1, 2, 5, 6, 7 and between 3.5-4.5v on pin3.
I just change Ic and I measured them again
and I have 9v on pin 8, 4.37 on pins all pins except pin 4.
Also I measured the transistrors on all pins they are 4.36V
Quote from: teknoman2 on August 06, 2012, 03:15:40 PM
Aslo I took the multi-meter and I noticed that the IN is grounded is that correct?
The PCB input pad should be grounded when the effect is bypassed, but if it is grounded when the effect is engaged, then that is a problem and would match the description of your problem. You have a pretty large solder blob down there by the input and ground pads. If that's your problem try cleaning that up with some braid and a hobby knife.
Don't worry about the transistor voltages. They're just being used as clippers, not amplifiers. And that sounds about right anyway. Good luck!
You are right when its off the In is grounded instead when is engaged it isnt.
I dont know what to do.....
I believe my pcb etching and soldering werent very good.
I think I find the problem but I m not sure,
the positive side of TONE pot and one side of the C8 are grounded.
When I look the layout and the diagramms they arent supposed to be ground
Right?
Quote from: teknoman2 on August 06, 2012, 08:34:21 PM
the positive side of TONE pot and one side of the C8 are grounded.
Not sure what you mean "positive side", but lugs 2 and 3 of the Tone pot should always have continuity to ground and, depending upon the rotation of the pot, lug 1 and C8 could have pretty low resistance to ground, too.
Lugs 2 and 3 are grounded but I believe lug 1 is not.
When I put the multimeter between ground and lug 1 I hear the buzzer so lug 1 is grounded
in my circuit.
I believe that is the issue or not??
I believe its not that one as well. I desolder them and I check the tracks they arent grounded
so thats out.
I dont know what else to do.
If I post the voltages of the entire circuit maybe are we gonna find any solution??
I think your best bet at this point is to build a signal probe as per the earlier post.
I would built a test probe the afternoon and
I will post my results later.
Thank you for your time.
I just built the rig tester.
Now I must put the audio probe to every component?
How I will realize if something is not working?
I saw the video of JMK but I didn't understand it very well from the point he uses the audio probe.
Thanks again everyone.
Yep, follow the schematic from the input and see if you loose signal along the way. May help you locate a bad part or other issue.
You have to understand the signal flow through the schematic in order to understand the best test points. For now, start with both leads of C1, both leads of R2, IC1 pin 3, IC1 pin 1 (warning: from this point on the signal should be loud as @#$%!, so keep your amp volume low), IC1 pin 5, IC1 pin 7, Volume pot lug 2. That's enough to get you started. Good luck!
Thanx again I will post any further progress.
I just test my egodriver with my rig test and
I found out that R1,C1,R2 are ok the signal passes through,
instead on C3,C2 and R3 I dont have anything.
I must change all of them (C3,C2 and R3)?
I believe it is better to change them one by one.
What is your opinion?
thanx again
When you say you have signal through R1, and R2, but nothing on R3 that's a bit confusing. Rather than talk about through, talk about which side of the part you get sound on. For example, you could say, "I get sound on the front side of R2, but not on the back side." This would mean that you get sound on the input side of R2 based on the schematic, but not on the output side of R2.
If that were the case, then I would say that either the soldering on that part is bad, the output of R2 is being grounded somehow, or perhaps R2 is faulty.
Jacob
I ment that I have signal on the front side of R1 but not on the back side. (R1 back side is grounded from the schematic).
I have signal through C1 on both sides.
Instead on R2 I have signal only on the front side and no on the back side (from the schematic the back side of R2 isnt grounded).
You suggest to replace R2 and check the soldering on that part??
Quote from: teknoman2 on August 09, 2012, 09:28:31 PM
I ment that I have signal on the front side of R1 but not on the back side. (R1 back side is grounded from the schematic).
I have signal through C1 on both sides.
Instead on R2 I have signal only on the front side and no on the back side (from the schematic the back side of R2 isnt grounded).
You suggest to replace R2 and check the soldering on that part??
Be careful not to get into "I need to replace components" mode too quickly. I think it's much more likely that you have a short to ground than you have a bad part. Test for continuity to ground from both the front and back of R2.