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Hi all

I've build the moodring reverb and it sounds great, the only problem I have is that the Dwell control does not seem to do anything except when you turn it above say 3 o'clock it goes into a sort of self oscillation (even in the buffered bypass mode). The document says that Dwell sets "The amount of reverb fed back into the pre­delay/reverb section." Well I have no idea what that sounds like.. Anyone care to explain what the dwell control does in terms of sound?

Also does it depend on the setting of the internal trimmer? I've turned it practically all the way down since there is loads of reverb anyway and as you turn it up the hiss increases..

thanks!

For anyone who might have the same problem..
I've been able to cut down the ticking in bypass down substantially by shielding wires that go to input and output jacks and also shielding the (plastic) jacks with alu foil.. Some slight ticking remains, but it is much better now..

blearyeyes above suggests "placing a cap across the power pins of the LFO IC" anyone has an idea how this would be done? where exactly should I put this cap and what value should I try?

thanks!

Hi all

I've finnished moodring and zero point mini builds. Both work but both have a noise issue.
As you turn up feedback/mix/time pots on the zero point - repeats get progresively dirtier/noisier - after about 12 o'clock on the three pots the noise is already very noticable and anoying.. I suppose this is not normal operation?

Moodring works better and sounds nice, but there is noise when you open the ring knob all the way up.. Also dwell knob doesnt seem to do anything - at least I'm not able to tell any difference when you turn the knob - except there is strong self oscillation when dwell is all the way up..

I've described the problems before here: http://www.madbeanpedals.com/forum/index.php?topic=19598.0 and here: http://www.madbeanpedals.com/forum/index.php?topic=19646.0

got some fresh PT2399's but that didnt help at all

any other ideas?
thanks!
martin

Indeed that solved the problem!!! Thanks!

martin

Hi all

so I've been having a madbean weekend.. after succesfull afterlife build (sounds great even with BAT41 diode!) I also finished zeropoint mini.. Problem is - there is no delay sound at all. When I engage the pedal - nothing happens - only dry signal gets through (wiring is OK - when I disconnect PSU there is no sound). Led inside blinks according to the rate control. Checked all caps and resistors, checked for solder bridges and all seems to be OK.. Voltages are:

IC1:
1: 4 VDC
2: 4 VDC
3: 4 VDC
4: 0
5: 4 VDC
6: 4 VDC
7: 4 VDC
8: 8 VDC

IC2:
1: 5.1
2: 2.5
3: 0
4: 0.1
5: 2.9
6: 2.5
7: 0.6
8: 0.6
9: 2.5
10: 2.5
11: 2.5
12: 2.5
13: 2.5
14: 2.5
15: 2.5
16: 2.5

IC3:
1: oscilating
2: 4
3: oscilating
4: 0
5: 4
6: 4
7: oscilating
8: 8

regulator:
8
0
5

only sound it makes is a loud pop when ring switch is flipped.. nothing else.
I appreciate any help!

thanks
martin

Thanks!

I've checked the caps and resistors you've suggested and they all seem fine.. Then I swapped few PT 2399 I had laying around and found that with some - the voltages are closer to what they should be.. (best IC measures around 1VDC on pins 7 and . So the problem is most likely connected with my bad PT2399 (I bought bunch of them some time ago for cheap and now I see why they were so cheap..) Also the problem with Dwell knob is much less noticable now with better IC, however its still there.. Also I get quite a lot of noise as I turn up the ring pot (even with internal trimpot set all the way down) so maybe that is also caused by the bad IC?

will order some fresh ICs and we'll see
thanks again
martin

Hello all

after few trouble-free madbean builds I finally arrived at a problem! Just finished a moodring reverb and it works and sounds nice, but there is problem with dwell control - when turned up beyond about 12 o'clock it causes feedback kind of weird hum which gets progresively louder even when you dont touch the strings.. You have to turn it down otherwise the hum just gets louder and louder.. same thing happens even in the when effect is bypassed! (effect is wired for buffered bypass) Checked voltages and they look OK - most are bit higher than published but not much, except for IC3. On pin7 I have: 1.5VDC and on pin8: 2VDC and oscilating..

Any idea what could be the culprit? Maybe a bad PT2399?

thanks
martin

this might help
http://www.diystompboxes.com/smfforum/index.php?topic=70732.0

thank you guys for your replies. I was very busy so the project was put aside for a while, but I will look into it in near future.

well, ticking is noticable while playing, but I can easily live with that... it is not very loud. It is however much worse while in bypass! You always have to bypass AND switch to autowah mode at the same time, otherwise ticking is very noticable.

blearyeyes: thanks for the tip! sorry for my ignorance, but which one would be the LFO IC? I guess something like 100uF will do?

Thanks Matt

sure I did adjust the trimpots, but I dont seem to be able to get it to sound right. I always end up with T2 fully clockwise and T1 around noon. Will try to swap the Q4 transistor and see what that does.

I did try to move the wires around, I redid the grounding of the whole pedal and.. ticking issue remains.
I thought that if the pedal is true bypass, then it is TRUE bypass  but this ticking is much more noticable when the pedal is bypassed, but it will go away as you turn down the volume knob on the guitar! Weird stuff

I'm gonna check everything again and post voltage readings.

thanks!

matt,

have you been able to solve the ticking issue? Yesterday I've finished my sharkfin build - filter mode seems to be working fine, but in SH mode I get quite loud ticking noise - and it is even worse when the effect is bypassed! When I turn off the SH mode while in bypass the ticking goes away. Ticking corresponds with the LED flasing. Also in SH mode it does that funky kind of sound but not at all as nice as in some demos I've seen. Mine sounds bit muffled, kinda lo-fi..

I'll check the usual stuff - solder joints, etc, but the ticking in bypass is kind of weird..

thanks