Pork Barrel: MN3007 & MN3102

[memor82]

I just found an error
I put a 47k in R38 instead of a 4,7k.
Tomorrow i'll modify and I will check.
Now it's time to sleep here in Italy

I will keep you updated
Thanks for your support!
Andrea

[Scruffie]

You can use the 3102 as long as you don't intend to run above 9V.

Jumper as per the MN3007 and Omit D4.

Hmmm. I remember that I used a v3102 with a v3207. I don't know if I tested an MN3102 with an Mn3007 but it has also been two or three years. I think probably not. I'll have to review the datasheets/docs to see what I did.

If all else fails, we can get you an MN3101 one way or another. But, I'd like to solve this too, if possible.

It shouldn't make any difference between the 3005/8 and the 3007 though...

I'll assume they're legitimate then.

No need to apologize

Right, black lead to ground, probe the red lead to pins 1 - 8 of the MN3102 on the 20V setting of your meter.

Ok the voltages are :
1=9,54
2=4,62
3=0
4=4,67
5=8,9
6=2,38
7=9,06
8=0,35

There's an oscillation of values on pin 2 and 7
(i checked with the "circle sign" of the opamp in upper position )
Thank you

Hmm, I'm not certain using the 3102 for the clock is the issue, pin 5, 6 & 7 are incorrect and they're hooked to the LFO yet 2 & 4 appear okay (clock voltage).

Yet you say the 3102 is getting hot... assuming you used a socket, try lifting lifting pin 8 for a start and see if there's any change, then post voltages for Q4 & 5 please

EDIT:

I just found an error
I put a 47k in R38 instead of a 4,7k.
Tomorrow i'll modify and I will check.
Now it's time to sleep here in Italy

I will keep you updated
Thanks for your support!
Andrea

Just saw this, this would explain the issues on Pins 5,6 & 7 I should think

[memor82]

Hi!
Like I said I notice an error in R38
and I replaced withe the right resistor (4,7k).
I also found another error in R14 (10k->100k)..also replaced
(ok I'm a newbie..but non so newbie!..maybe I was drunk )

So now..the blinkin' light has more "power"..more light
and when I touch the trimmer I found a position (about half way)
where starts an "Heartbeat" (synchronously with the light)
but nothing about the chorus sound   
Also the MN3102 now it's cold
(when I'll come back from work I'll take the voltages
of the opamp)

[Scruffie]

Take voltages of the entire pedal (all the ICs & Transistors) it's easier than doing it in snap shots to debug.

[memor82]

Take voltages of the entire pedal (all the ICs & Transistors) it's easier than doing it in snap shots to debug.

Ok!
For the transistor how can i take voltages?
Black -> ground
red -> every pin of the transistor
Is this correct?
Thank you

[Scruffie]

Take voltages of the entire pedal (all the ICs & Transistors) it's easier than doing it in snap shots to debug.

Ok!
For the transistor how can i take voltages?
Black -> ground
red -> every pin of the transistor
Is this correct?
Thank you

Yes that is correct

[memor82]

Just finished the test:

IC1= 4.7 4.7 4.7 0 9.6 4.7 4.7 4.7
IC2= 4.7 7.7 (3.8/5.7) 0 9.6 (3.8/5.7) 4.5 4.7
IC3= 9.3 4.2 0 4.3 8.7 3 8.6 (0.5/0.7)
IC4= 9.4 4.3 4 8.8 6.9 0 4.3 0

Q1 (CBE)= 9.62 3.11 3.89
Q2 (CBE)= 9.62 4.13 4.09
Q3 (CBE)= 9.63 3.35 3.92
Q4 (CBE)= (3.98/6.35) (0.48/0.59) 0
Q5 (CBE)= 9.4 (3.1/4.4) (3.4/4.9)

THANK YOU GUYS!

[Scruffie]

Could you please re do your IC3 & 4 readings listed like this;



1)
2)
3)
etc.

Just makes them a bit clearer and I think you might have written them in the wrong order there

[memor82]

Could you please re do your IC3 & 4 readings listed like this;



1)
2)
3)
etc.

Just makes them a bit clearer and I think you might have written them in the wrong order there

Ok..but I don't understand: the value that I posted (in ic3 and ic4) are an average because
there's a continuous oscillation on each pin of the ics except for the third pin of IC3(zero) and the eighth pin of IC4 (zero).
I re-done the test:

ic3:
1) 9.3
2) 4.2
3) 0
4) 4.3
5) 8.7
6) 3
7) 8.6
0.5

ic4:
1) 9.4
2) 4.3
3) 4
4) 8.8
5) 6.9
6) 6.9 (this was previously wrong ..)
7) 4.3
0

[memor82]

This is the pcb:

[Scruffie]

I think you might have written your voltages down wrong again, IC4 makes sense if you have the voltages written as 1,2,3,4,8,7,6,5.

But did you do the same on IC3?

If so, lift out pin 8 and connect pin 4 of IC4 to pin 5 and see if that works.

[memor82]

Ops..you're right :-) i reversed the second quartet off all ic!
:-)
I'm sorry 
I write the right scheme:

ic1:
1) 4.7
2) 4.7
3) 4.7
4) 0
5) 4.7
6) 4.7
7) 4.7
9.6

ic2:
1) 4.7
2) 7.7
3) 3.8/5.7
4) 0
5) 4.7
6) 4.5
7) 3.8/5.7
9.6

ic3:
1) 9.3
2) 4.2
3) 0
4) 4.3
5) 0.5
6) 8.6
7) 3
8.7

ic4:
1) 9.4
2) 4.3
3) 4
4) 8.8
5) 0
6) 4.3
7) 6.9
6.9

I hope to be luckier this time 
In this case, what can I do?
Thank you very much

[Scruffie]

As I said, lift pin 8 of IC3 and connect pin 4 & 5 of IC4 together with a jumper and see if that works.

[memor82]

Ah ok!
This evening i'll try.thank you Scruffie!

Inviato dal mio Galaxy Nexus utilizzando Tapatalk

[memor82]

As I said, lift pin 8 of IC3 and connect pin 4 & 5 of IC4 together with a jumper and see if that works.

Ok just made this mod.
It works!! 
Now there is the Chorus effect !
But the signal ,when I activate it,
loses MANY db and the sound become dark..
What can cause this?
Thanks!