Madbean Current Lover Really needing some help!

Started by malachi, March 31, 2015, 12:00:44 PM

Previous topic - Next topic

malachi

I posted this on Madbean forum and never received a reply, prehaps I don't know how to ask for help correctly so if I blunder this attempt, please overlook any offenses as I do not wish to annoy anyone, simply would like a little insight before I throw this project in the "should have known better" file.
Hi everyone, I am hoping someone could offer some help or advice as I try to get my current lover running correctly. I built the 3007 version with a madbean pcb. Switch off, great dry signal, switch on, led indicator on, and sounds simply like the dry signal passing through. I have gone over the board so many times now and I simply cannot find a bridge or anything evident. I purchased a new pcb but my ocd for pedal building has just not let go of this first board.

A lot of oscillations indicated by the --> going to and from, I did know how else to indicate that. If anyone could offer any advise I would certainly appreciate it.

Thanks

My measurements seem whacky when I compare with others I have found so I thought I would pass that along for your suggestions,
JRC4558: pinout
1 4.2
2 4.2
3 3.78
4 0
5 4.08
6 4.12
7 4.10
8 8.25

MN3007 (ebay purchase - all other components Mouser)
1 8.19
2 OL -> .308 -> OL -> .308...
3 2.24
4 0
5 0
6 8.17
7 6.68
8 5.55

CD4049
1 8.25
2 8.25 -> 3.94 -> 8.25...
3 0 ->3.8 -> 0 -> 3.8...
4 0 ->3.8 -> 0 -> 3.8...
5 4 ->8.2 -> 4 -> 8.2...
6 4 ->8.2 -> 4 -> 8.2...
7 0 -> 4 -> 7 -> 4 ->
08 0
9 8.19
10 0 -> 4 -> 0 ->4 ...
11 4 -> 5.6 -> 7 -> 8.1 -> 7 -> 5.6 -> 4 -> 5.6 -> 7 -> 8.1 -> 7 -> 5.6 -> 4
12 0 _. 3.8 -> 0 -> 3.8...
13 0
14 0
15 4 -> 8.2 -> 4 -> 8.2 ...
16 0

CD4013
1 4
2 4 -> 8 -> 4 -. 8...
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 8.3
14 8.3

LM324
1 4
2 4 -> 5.7 -> 7 -> 8 -> 7 -> 5.7 -> 4 -> 5.7 -> 7 -> 8 -> 7 -> 5.7 -> 4
3 4
4 8.1
5 1 -> 1.8 -> 1 -> 1.5
6 1 -> 1.8 -> 1 -> 1.5
7 .3 -> 3.5 -> .3 -> 3.5 -> 3 ...
8 6 ->0 -> 6 -> 0 ...
9 3.7
10 .3 -> 5 -> .3 -> 5 -> .3 ...
11 0
12 3.75
13 3.75
14 3.5

LM311
1 0
2 0 -> 3 -> 0 -> 3 ->0 ...
3 4.25
4 6
5 8
6 8
7 .3 -> 2 -> .3 -> 2 -> .2 ...
8 8

Q1 3409
e 6.1
b 6.74
c 8
Q2 5087
e 7.7
b 7.2
c 1.5
Q3 5088
e .75
b 1.33
c 5.6

It is so erratic that I think one components is messing everything up so I tried replacing them all with the same results. I did just buy a mn3007 from SD SB. Should arrive sometime next week, hopefully but honestly, I think it is more than the bbd. Anyway. I would certainly appreciate any advice, opinions or suggestions as long as they dont involve goats, seriously though, thanks for looking.

Mali

DrAlx

I don't know how you are measuring your voltages (with a scope or DMM) but there are inconsistencies in lots of places.
So either your measurements are bad, or the build is bad, or the schematic that I've looked at is bad.

e.g.

Look at the schematic and you see the 4013 pins 1 and 2 are directly connected to 4049 pins 5 and 7 respectively
but your measurements don't show that.
Also pin 2 of the 4013 oscillating but its complement (pin 1) not.  They should be similar.
Also Pin 3 of the 4013 is not matching pin 7 of the LM311N even though they are directly connected.

I'm sure its possible to find loads more but before wasting anyones time on this I suggest you first of all do some basic checks for yourself like this...

Print out the schematic and write down the measured pin voltages all over it, and see if you can spot obvious mismatches or errors between things that are directly connected together in the schematic, or connected to the supply or ground.  When you've at least got a self consistent set of voltages, then post them again.
If you've got a voltage mistmatch for things that should be connected together in the schematic, then you must have a bad connection between them (bad solder joint, or broken track).





Govmnt_Lacky

Definitely have clock issues. You should be seeing almost the same voltages on Pin 2 and Pin 6 of the MN3007. And they should be steady voltages. Around 4.5V if you are using a 9V power source if I am not mistaken.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

malachi

Guys, thanks a bunch. That is exactly what I was hoping for. I appreciate very much the strategy and will do just that. Again, thank you both.