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PostPosted: Sun Oct 14, 2018 5:51 pm 
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So, I've finished my build, plugged her in and nothing. No overdrive, no LED. Pass through works. I've tried with both DC and battery. I've gone through the instructions again to see if I missed something or connected something incorrectly and can't find anything obvious. I'm going to start redoing the connections probably on the footswitch first, then the DC input, but wanted to post some photos here to see if anyone sees something or can give me some advice on where to start. Ta!


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Last edited by chrisr on Mon Oct 15, 2018 8:56 am, edited 1 time in total.
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PostPosted: Sun Oct 14, 2018 5:58 pm 
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By the way, I know in the PCB underside photo the 8,7, 1 and 5 look like bad connections...and maybe they are, but from the other side they look okay (can't really see in the photo, but to my novice eye...). I attache another photo where you can see a couple of those connections from the top side. The solder just didn't wick through.


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PostPosted: Sun Oct 14, 2018 8:15 pm 
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Double check the wiring on your DC jack. You might have swapped the two + wires. Post a photo that shows how it's wired if you're not sure.

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PostPosted: Sun Oct 14, 2018 8:24 pm 
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Thanks. Here's a couple photos. I double checked that and think I have it right, but maybe not. In the photo where you can see the PCB, the middle (left +) is connected to the lower tab. The right is connect to the right (higher) tab.


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PostPosted: Mon Oct 15, 2018 10:09 am 
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What voltage reading do you get on pin 8 of the op amp? Make sure you have a plug in the input jack to turn the power on.

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PostPosted: Mon Oct 15, 2018 12:26 pm 
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byoc wrote:
What voltage reading do you get on pin 8 of the op amp? Make sure you have a plug in the input jack to turn the power on.


By "op amp", do you mean the footswitch? I haven't checked the voltage on that. Can you tell me how to take that measurement with a multi meter? Positive lead on the 8 pin and negative on the DC input negative? Thanks.

update: Probably answered my own question. using method above, switch on, 9.6v at the 8 pin on the footswitch. switch off, 0v


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PostPosted: Mon Oct 15, 2018 1:26 pm 
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chrisr wrote:
By "op amp", do you mean the footswitch?

No. The op amp is a type of integrated circuit (IC) and is the rectangular black component with 8 legs installed in the 8-pin socket. In this case, it's a TL072 general purpose dual op amp.

To measure the DC voltage level on the op amp pins, set your multimeter to the DC voltage mode; use the 20VDC range setting if it's not an auto-ranging meter. Put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. Then touch the red probe to the point that you want to measure. Of course, your power source needs to be connected and there needs to be a cable in the input jack. Pin 4 of a dual op amp should read 0 volts (ground), pin 8 should be your power source voltage, and the other pins should all be very close to 1/2 of the source voltage (nominally 4.5V). See image below for the numbering of the pins.

Image

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PostPosted: Mon Oct 15, 2018 2:29 pm 
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Well, I'm getting no readings at all. I tried the red probe on both the IC legs and on the solder joints on the back of the PCB. No readings on any of them.


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PostPosted: Mon Oct 15, 2018 3:13 pm 
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What do you get at the two + eyelets on the PCB?

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PostPosted: Mon Oct 15, 2018 3:41 pm 
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With DC plugged in and with the black probe on the casing, I have no reading on either of the two + connections from the DC Plug. If I move the black probe to the negative on the DC plug, I get 9.7v on the right most + socket (furthest from the - socket) and 0V from the left + socket (adjacent to the - socket).

Also, with the black probe on the negative tab of the DC plug, I get 9.7v on each of the IC prongs as well as the solder joints on the back EXCEPT on #4 which is 0V.


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PostPosted: Mon Oct 15, 2018 5:12 pm 
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If you're not getting continuity between the enclosure and ground, then you probably need to reflow your solder joints.

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PostPosted: Tue Oct 16, 2018 12:13 pm 
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Make sure you have a cable plugged into the IN jack when doing voltage measurements.


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PostPosted: Tue Oct 16, 2018 1:13 pm 
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mmarsh wrote:
Make sure you have a cable plugged into the IN jack when doing voltage measurements.

...and your power source (battery or "wall wart") plugged in. Yeah, sounds stupid, but we've ALL done it! :roll:

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PostPosted: Tue Oct 16, 2018 2:09 pm 
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^ this, including me!


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PostPosted: Tue Oct 16, 2018 3:15 pm 
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mmarsh wrote:
Make sure you have a cable plugged into the IN jack when doing voltage measurements.


Aha! That I was NOT doing. I'll try it and see if I get a different result.


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