Saturday, May 16, 2015
Simple JFET Buffer
Here's a simple one for your Saturday. As the name implies, this is a simple buffer based around a JFET transistor. This layout follows the schematic from Jack Orman's great article on Basic Buffers. Thought this would be useful if you want to add an input buffer to an existing pedal or to a project that doesn't have one.
Works like a charm! thank You for layout.
ReplyDeleteit not working, but it work if connected after other pedal. for example if is connect it after comp, works but with a under volume and warmmy tone, without treble. and if is connected before comp (1st on the chain after guitar) do a breakdown voltage sound. imposible to hear de guitar sound, because guitar sound... not sound hahaha
ReplyDeletethe sound when is 1st on the chain is like these... prr prr prr prr nnhh nh nh nh... understand?
thanks so much for your time!!
PD: im use J201 and 2N5457 and have the same problem
Will this work as a stand alone? I'm looking to build a stand alone buffer and I'm torn between this, the cornish, and the stupidly awesome buffer
ReplyDeleteIt will work by itself, but the Stupidly Awesome or Cornish are probably better (I'd lean towards the Stupidly Awesome one personally).
DeleteOut of curiosity why do you prefer that one? I plan on building both the cornifh the stupidly awesome but the more info I have going in the better :)
DeleteIt really all comes down to personal preference. You're approaching it the right way by building both and seeing which one you like. I've not built either one, so take what I saw with a grain of salt. I've read that the Cornish buffer colors your tone a little bit. Not necessarily a bad thing, but the Stupidly Awesome buffer is pretty similar to the Klon buffer (which I have built and like and it doesn't color my tone from what I can tell) and so I'm guessing is more likely to be more transparent. Just my 2¢.
DeleteWhere I can tweak or put a trimpot to adjust output?
ReplyDeleteI'll try this one in front of a Silicon Fuzz Face.
Thanks!
You could wire a 100k trim pot like a volume pot off the output I guess. (Out to lug 3, lug 2 to out, lug 1 to ground.) This thing should output at about unity though.
DeleteThanks... I'll see how it goes.
DeleteDoes this buffer work to solve the problem with using fuzz face and wah wah?
DeleteHello, after a long time I return to resume this project.
ReplyDeleteI will print the pcb and start over.
But I have a question. What will happen if I place this circuit inside a volume pedal.
The order (inside the ordinary volume pedal) Imput VP -> JFET Bufffer -> Potentiometer -> output vp
Should I try?
Thanks for everything!
I think that order would be fine.
DeleteGonna try this weekend. wish me luck, lol
ReplyDeleteAnd thanks for that one too! I put one at the input of a deluxe pitch pirate that really needed it. Nice tiny layout!
ReplyDeletei did not find pcb in image library, please help
ReplyDeleteIt's in the AMZ folder
Deletepodre hacer este con BC 549?
ReplyDeleteNo, el BC 549 es un BJT y este buffer usa JFETs. Probá con J201 o 2N5457. Se pueden conseguir SMD y fabricar un adaptador (para no tener que modificar el layout o recurrir a los encapsulados tradicionales porque vienen truchos)
Deletewhat i have to do to turn the phase 180 ° so that i have a buffer that inverts the phase?
ReplyDeletePlease give parts/components list...ty
ReplyDeletewhich resistor must be replaced to get volume above the unit? hey man, very good project. thanks!
ReplyDeleteHello, can this buffer be used in the output of the effect as well? I had a very loud 3pdt pop in a Clone from ISP decimator, and the idea came to me to put this buffer on the input of the isp, but it ended up working perfectly on the output of the effect, now smooth without pop! Thanks
ReplyDeleteSimple buffer but it works perfectly!
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteI built this one and just put in the same box of the zombie chorus II (which ticks unless there`s a buffer in front), the small size helps to fit just below the 3pdt switch.The input jack goes to the buffer input and the buffer output right to the 3pdt input jack pin, this way the buffer works just like boss pedals. No ticks, zero noises and the signal is great no matter if the chorus is activated or not.
ReplyDelete