This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, April 3, 2018

Lovepedal Tchula

Another Electra variation from Lovepedal. It's described as a two-stage COT50... I guess the "stages" are the different ways to bias the transistor off the emitter. The stages are switchable via footswitch in the originals, but if you put it on a toggle switch you should be able to fit it in a 1590A. Here's the schematic (this was traced from a cream box Tchula):




21 comments:

  1. Verifield. Yeah.
    But i try TR 2n3904 and dioda is 1n4148.

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    1. jauh ga mas perbedaan soundnya dibanding pake BAT46?

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  2. Also verified, and with 4148's. Thanks for a great layout D!

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    1. How does the sound of 4148's compared to the stock?

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    2. Probably like a much warmer COT50! :D

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  3. Does anyone have the wiring schematic of sw1 and sw2 to 3pdt switch ? What if i connect sw1 and sw2 cable to spst switch (2 prong toggle switch) (On and On side both of them) ,will it work ?
    Sorry i'm just newbie, have a nice day everybody :))

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    1. An spst on/on would work. To wire to a 3pdt, just use 1-2, or 2-3 or 4-5 or 5-6 or 7-8 or 8-9. Any of those should work.

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  4. Does anyone have any reference to how I connect the 2 switches? thank you

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    1. Wire the on/off switch (3PDT) like the diagram in the General Layouts Notes tab. For the other switch, use a DPDT footswitch and wire lugs 1 and 2 to the corresponding pads on the board (reference the switch diagram in the General Layout Notes for lug numbering). Then wire an LED like you would with a 3PDT with the other side of the DPDT (4.7k resistor from +9v to LED+, lug 4 to LED-, lug 5 to ground). Hope that makes sense.

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  5. My very first build of a guitar pedal ever! Did it on protoboard with a few changes from the original. Highly recomended for beginers!

    Just a thing, by my thoughts, I can run this babe with a higher voltage (12v or even hihger) for more headroom Is that right or am I wrong?

    Pretty neat site btw. Cheers!

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    1. Yes, higher voltage should give you more headroom. Just be sure your components are rated at a high enough so nothing blows up! haha

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  6. I suggest adding a 47ohm resistor between the 47uF capacitor and the switch (on/off), because if it stays that way, when the gain is at its maximum it will have an excessive treble with too much bass loss.

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  7. Hey all,
    So I built this thing this week and am getting extremely low output - tried swapping out the transistor (socketed) and still getting the same issue. Don't see any blatant solder bridges. Any suggestions on what I should look into? Should I be seeing specific voltages at the transistor? Thanks!

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    1. Double check you've got the right values for the resistor between the base and collector of the transistors, the resistor from voltage to the collector... That last one you may need to adjust to bias the transistor correctly.

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  8. Does the bias potentiometer only work if SW 1 E 2 Are actuated?
    When it is off, the bias potentiometer does not work.

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  9. PT: excelente layout e um timbre impressionante para stratocaster e lespaul :) coloquei um resistor de 47ohms entre o capacitor de 47uF e a chave on/off como indicaram e adicionei mais duas alterações; troquei o potenciômetro por C1K, inverti as pernas 1 com 3, para o efeito ser crescente da esquerda para a direita e adicionei um trimpot para volume. abraços!

    EN: excellent layout and an impressive timbre for stratocaster and lespaul :) I put 47ohms resistor between the 47uF capacitor and the switch on/off as indicated above and added two more changes by myself; I changed the potentiometer by C1K, inverted the legs 1 to 3, for the effect to be increasing from left to right and added a trimpot to volume. hugs!

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  10. Built this with the BAT46's. Great pedal, many thanks!

    Has anyone tried a Ge NPN in theirs? If so which transistor and what were the results?

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