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.

Monday, January 18, 2016

JHS Little Black Buffer

Here's a simple buffer from JHS. It really only uses one side of the opamp (why not just use a TL071?) and the extra resistors on the other side are just to meet the manufacture's specs for an unused side. I couldn't find a schematic for this one, but drew one up from lvlark's vero layout. I've added polarity protection and extra power filtering to the layout.


24 comments:

  1. I just finished this little guy. Works like a charm! :)

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    1. good job bro, can i ask about the ic what is the replacement of TLo72?

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    2. TL072s are extremely common. I guess a 4558 would work too, though probably not as cleanly.

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  2. Hey, I'm pretty new to pedals but though a buffer would be a good place to start. I understand everything except understanding what pins of the IC to use on the upper schematics. Since they aren't labelled how do you know which pin is which?

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    1. Google TL072 pinout. Should clear things up for you.

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  3. Hi man!! Thanks for the info, only one question, how can I add a led to the circuit? To make it like Jhs? Thanks and I'll be waiting for your answer.

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    1. Run a 4.7k resistor from 9v to the anode (+) of an LED, and the cathode (-) to ground.

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  4. one more question, can i use TL072cn instead TL072? and what type of caps do you recommend?

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    1. Yes that'll be fine. Film caps are probably best.

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    2. Thanks man! You're the best! greetings from Cholula México!!

      The last one!! Which buffer do you reccomend for fixing Volume Pedal Tone Suck?

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    3. the Klon Buffer is my personal favorite

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  5. Thanks man! Amazing layout! One question: What's the exact size for the PCB? Thanks!

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    1. Check out the Transfer Image Library tab at the top of the page

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  6. Hi!!! A doubt (sorry for my questions, I'm a newbie) the 10uF and 47 uF caps are polarized?? The marked side is the positive or negative? Thank you so much man!! You're the best!!

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  7. i already build this little buffer, but the volume is too low =/ what can i do wrong?

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  8. Yes, the volume is too low In my case too

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  9. Hello, how are you? I'm trying to put this buffer in a loop box, but very POP when it's added to a 3PDT circuit. What can it be?

    https://www.gearslutz.com/board/attachments/low-end-theory/354945d1374679650-new-stomp-box-loop-killing-volume-when-off-loopernoled_sml.gif

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  10. Is the buffer between the input and the switch or after the switch?

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  11. In various positions I have POP.

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    1. You could try putting a pulldown resistor at the output of the circuit. There's already one at the input (tho you could try increasing its value). Have you tried using a different switch?

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  12. hola amigos, de que punto puedo sacar una señal para poner un led de iluminación para avisar que está encendido el pedal??

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