BAJA Sagittarian Charger (mini KLON)  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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danielzink
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Post by danielzink »

pakrat wrote: I don't have the 15k resistor in parallel to the 82nf cap either because I didn't see it listed on the V2 layout that I have, do I need it?

It's already there....

Look at the 82n on the layout and note the 15k sandwiched right next to it - and the traces that connect them (v2)

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Post by pakrat »

Thanks Dan, I didn't even notice that :oops:

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Post by pakrat »

I just went through with an audio probe and I don't get clipping anywhere, even on the 1N34A's themselves.

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Post by bajaman »

check the value of the resistors associated with the gain stage op amp (the one that drives the clipping diodes) :wink:
R6, R10, R11, R12, R13

ALSO

Check that you haven't got a solder bridge between the pins 6 and 7 of the op amp :hmmm:
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Post by pakrat »

Thanks again for helping bajaman. All resistors checked OK and I found no solder bridges anywhere on the board. I also have tried different TL072's and there is no change.

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Post by bajaman »

Okay - post some hi res pictures then (both sides of board please)
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pakrat
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Post by pakrat »

Here are some pics. I apologize for the quality.... looks like it's time for a new camera.

Image

Image

Thanks!

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Post by apollomusicservice »

to "pakrat", check R2 on your board. It seems to me that is 10k and it should be 1M. :hmmm:

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Post by pakrat »

apollomusicservice wrote:to "pakrat", check R2 on your board. It seems to me that is 10k and it should be 1M. :hmmm:
Checked R2 and it is 1M, thanks for the input though :thumbsup

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Post by bajaman »

please provide a photo showing the gain pot to the board connections :wink:
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Post by pakrat »

Here s the gain pot wiring.

Image

The orange and white wires on the left are going to 3a and 1a respectively. The next 3, orange, white, and green go to 3b, 2a, and 2b respectively. Then there is a link from 2a to 1b. The wires have taken a little beating from trying the different diagrams floating around. :blackeye

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Post by bajaman »

Okay - I can see the problem now :wink:
Move the orange wire (top left on back of pot) across to the far right terminal of the pot (where the link wire is presently connected incorrectly), and now connect the link wire to where the orange wire was previously connected on the rear section of the ganged pot. :thumbsup
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pakrat
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Post by pakrat »

Ok, I swapped the link and orange wires which now makes the pot work in reverse.... I still have only clean output.

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Post by bajaman »

picture again please :wink:
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Post by pakrat »

This wiring makes the pot work in reverse:

Image

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Post by bajaman »

okay - it works in reverse - not a problem - put the wires (and link) back how they were and then swap the orange and white wires on the other pot wafer.
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Post by pakrat »

I put the link and wire back, pot works normally now. Swapped orange and white on gain pot "A" and it's still clean signal only. Are there other diodes I can try besides 1N34A to rule them out as a problem? I really appreciate you putting in time on this bajaman.

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Post by pakrat »

I still have failed to figure this thing out. After checking every component I thought I had the answer in that I used non polarized 1uf electros because it was all I had at the time. I have since replaced them with polarized electros and it remains the same.... just a clean boost. I measured the voltage at the diodes and I get 0.7v which, if I'm not mistaken, falls within the parameters of the forward voltage, yet no clipping. So I removed the diodes and measured. I get 4.5v but if I leave the probe on there the voltage drops until I remove the probe and it will build up again. I understand that sometimes a build probably can't be debugged, and I appreciate everyone who tried to help. I have decided to build the official bajaman V2 just to have a Klon, but I still would love to find out what went wrong with this thing. Thanks again for this project, and your help bajaman!

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Post by gilmour_pugliese »

Just found some OA-5 black glass diodes from the '50s...
http://www.radiomuseum.org/tubes/tube_oa5.html

Their V-drop is just perfect for a good Klon-e :horsey:

Also, I own about 100 OA-95, but the range is from 0.60mV to 0.72mV, just too high for a Klon, or not?
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Post by BQmusic »

While building a Klon clone on perfboard i couldn't help noticing that on the Saggitarian Charger PCB C6 and R9 have switched position as to the schematic. I presume they are part of the mid filter. Could this make a difference in sound or not?
I swapped them anyway and my Klon is working perfectly:-)

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