Understanding kleinulator

[soje]

I bought a G-major really cheap on the net, and need a buffered loop for my D-clone.

I have a d-lator in the planning, but it's somewhere in the future and I have parts on hand to whip up a Kleinulator.

As sugested on this forum I'm planning on running the kleinulator in series mode, but the circuit raises a question:

When in series mode, are you not slamming the sh* out of the poor jfet in the gain stage, unless input levels (master on the dumble) is turned way down?

Regards
soje

[Structo]

no, I don't think so.

Have you checked out the manual?

http://www.ceriatone.com/Manuals/ceriat ... 072508.pdf

[soje]

Thanks for your reply!

yes I have read thru that manual, however I believe that is focused on a kleinulator without the series/parallel switch.

If a J201 has been used for the gain stage, is it reasonable to asume the input sensitivity is around +/- 0.75V?

[Structo]

Sorry, I haven't seen one with a series/ parallel switch.

There is no mention of that in the manual I posted.

I built a tube buffered Dumbleator and use it in series mode with a TC Electronics G Sharp plus my pedal board with no issues.

[ToneMerc]

When in series mode, are you not slamming the sh* out of the poor jfet in the gain stage, unless input levels (master on the dumble) is turned way down?

Regards
soje

Yep, that's why the original version no longer uses only a 9v supply. They are easily overdriven, but if you increase the supply voltage it makes a world of difference. The newer version(no layout link posted) has a different style power supply. It uses a uses a charge pump IC to get the voltage up around 33V. I built one at 36V, experimented up to 41V and it seemed to work great.

I had layouts of a series/parallel and the new PS version on an external drive but it crashed awhile back.

If I just had to build a solid state one, I would build the higher voltage version. My first pick would be the tube version though.

http://datasheets.maxim-ic.com/en/ds/IC ... AX1044.pdf

TM

[soje]

Tonemerc:

The tube version (d-lator) is definately in the plans, however I really want to get started playing around with the G-major

May I ask which j-fets you used in your klein? I have a 30V adapter from a HP inkjet, so I'll definately get the volts up there. I was trying to sim the cicuit, and play around with the values and different j-fets.

Using the 2N3819 gave more headroom. I wanted to try the sims with the MPF102, but I couldn't find a spice model. There's also the issue with max ratings. The two mentioned j-fets have a max Vdg of 25V

[Structo]

Have you tried the G Major just plugged into the passive jacks on the amp?

Try short patch cables with the G Major sitting on top of the amp, it may sound fine.

[ToneMerc]

Tonemerc:

May I ask which j-fets you used in your klein?

IIRC, a Fairchild J201.......... most definitely a J201 though.

TM

[ToneMerc]

Tonemerc:

The tube version (d-lator) is definately in the plans, however I really want to get started playing around with the G-major

May I ask which j-fets you used in your klein? I have a 30V adapter from a HP inkjet, so I'll definately get the volts up there.

Just keep in mind that you will always be tethered to that 30V wall wart. Whereas, if you use the charge pump circuit you can power it from a commonly found 9V pedalboard wall wart.

TM