May Overdrive - No output

Started by rockaffe, December 29, 2018, 03:25:01 PM

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rockaffe

1. I've build it 2 times on veroboard and 1 on breadboard and all the times I get no output at all.
2. Name of the circuit = May Overdrive
3. Source of the circuit (URL of schematic or project) = https://paulinthelab.blogspot.com/2017/09/may-queen-overdrive-originally-by.html
4. No modifications to the circuit
5. No parts substitutions
6. Positive ground to negative ground not specified in the schematics or project

Here is some readings:

Battery: 9,44

Positive: 9,35
Negative: 0

Q1

C: 0
B: 0
E: 8,99

Q2

C: 0,16
B: 0,64
E: 0

Q3

D: 5,59
S: 1,50
G: 0,15





Thanks for the help!

Slowpoke101

#1
The most immediate problem that I can see is that you have what looks like a 47R resistor in the R3 location. It should be a 47K resistor (yellow, purple, black, red with brown for the tolerance ). Change that resistor and test again. Let us know how you go.

Edit: Also Q1 (T1 ), if it is a 2N5088 device, even though it is shown the way it is on the board layout, it is in backwards. Flip it around.
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rockaffe

Quote from: Slowpoke101 on December 29, 2018, 03:45:54 PM
The most immediate problem that I can see is that you have what looks like a 47R resistor in the R3 location. It should be a 47K resistor (yellow, purple, black, red with brown for the tolerance ). Change that resistor and test again. Let us know how you go.

Edit: Also Q1 (T1 ), if it is a 2N5088 device, even though it is shown the way it is on the board layout, it is in backwards. Flip it around.

Oh God, I've just seen that the codes are reversed on the strips!
My bad to have not checked them before...
I'll try to change it and then I'll let you know.
Thank you!

rockaffe

Problem solved! It was that resistor. And this solve the problem to another pedal that use that same resistor. Too bad to be a noob!
Thank you again!

Slowpoke101

You got both effects working. That is good news  :icon_mrgreen:

Do not feel bad because you are new to this fun hobby. We all started as noobs (newbies, etc ) Just keep having fun and learning at the same time. You never really ever stop learning new stuff - even if it is old stuff, but it is new to you  ;)

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Marcos - Munky

Nice to hear it was a simple thing and you got it working. And we do this - using wrong resistor values - lots of times, so nothing to shame about.