Dumblator Question

[hans-jörg]

Hello,
I have a question to the serial/parallel switch.
One side has a ground connection in "off" position, but in the schem of Claus its at the Send side but Structos layout shows the other side (which goes to the recovery pot).
On which side of the switch is it right?
I personaly tend to the schem from Claus-umblator

Best

Hans-Jörg

[hans-jörg]

Hi,

I found now this from BobW:


Posted: Mon Mar 15, 2010 3:49 pm Post subject:

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Tom, electrically your layout works but the leftmost 220k connected to the series/parallel switch toggles to either the bypass or to ground. According to Claus' schematic his resistor toggles to either the bypass or open.

Your 2nd leftmost 220k toggles to either the send pot or to open. Claus' resistor toggles to either the send pot or to ground.

Electrically they are the same since both switched 200ks share a common node, but following your layout and comparing it to Claus' schematic may get confusing for some. As you stated, it's obvious Claus is using a fixed 220k as a recovery, you are using a 250 pot. So simply moving the ground wire on your parallel / series switch to the bottom left contact would then make your layout match claus' schematic minus the recovery ckt.

Just something I noticed and though it would help others understand the differences between the schematic and the layout posted. hth


So I will wire it like the schem from Claus

Best

Hans-Jörg

[talbany]

Heads up!!

The problem with this method of series parallel switch is that in parallel your effect could and most likely be out of phase, causing your effect to sound rather thin and hollow..

Tony

[Structo]

Heads up!!

The problem with this method of series parallel switch is that in parallel your effect could and most likely be out of phase, causing your effect to sound rather thin and hollow..

Tony

Maybe that is why I didn't like the parallel version.....

Hi guys,
I posted the series/ parallel loop as "UNTESTED" because I never built it as shown.

I did change the layout as per Bob W's comment.

Claus's schematic does not show the 250K Recovery pot as noted.

The original Dumbleator only had the Send and Return pots.

Later H.A.D. updated the Dumbleator to include the Send, Return and Recovery or Output pots.

Personally, my Dumbleator works better for me in the stock series mode with Send, Return and Recovery or Output.
The three pot design is much more versatile with pedals and rack units.

If it is still incorrect let me know.

[hans-jörg]

Hi,
I had the Lator working (3 Pots)and wanted implement the Reverb from Belton. There the problems started. I got terrible hum, probably problems with grids and as more I worked on it as terrible it gets.
I have the "painted" board from H.A.D., eched by myself.
But now I have around 3 Volts at cathode and grid instaed of 0 V DC and 1,6VDC like before and 75 V at anode. On the other side my perfect 31 VDC at cathode is gone and shows 8 V.
Something happend with the board. I have contact (ohm meter) where should be nothing
After 3 time de- and re soldering of complete board I decided to build a new one this morning. All new Cs and new Rs (although I measured every single peace with no failure).
Tomorrow I can connect it into the chassis - hope it works otherwise it flys through the window.

I used the layout from Structo - compared with the schem from Claus (serial/parallel with Rec. pot).
There should be now no mistake and it is more or less the same built like before - which worked well and satisfied me - now every peace is new, except pots and switches.

Terrible, never been so helpless. Hope it was the board.
Can you imagine: you see no contact between copper traces - but you can measure something between 6 and 11 M ohms - evan where is no trace at some points! I cleaned with alkohol and brushed it but ...


Best

Hans-Jörg

[Structo]

That is strange.

Hopefully the new build will work.

You could always make an eyelet board and hardwire it.

[hans-jörg]

Thank you Tom,
yes this is now an eyelet board (a sort of this red Marshall boards - thick, hard and enough space between the eyelets) and HARDWIRED. And will work.

I guess I had in some way the same problem like the old Fender paper boards.

Best

Hans-Jörg

[bluesfendermanblues]

Hi Guys,

Thought I'd chime in regarding the Dumblelator in parallel.

I have to agree with Tony that, running the d'lator in parallel is not that great. After posting the design and using it for a while I converted back to regular serial mode.

Next, I will try member Aflynt's reverb design and his approach to integrating reverb into the Dumbleator loop. AND you can simply add the effect in parallel to the ordinary loop and get best of both Worlds - running the direct signal in series and running the effect in parallel.

[bluesfendermanblues]

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