Comments on: AMZ Jfet Buffer-Splitter

By: LC

LC — Sun, 20 Feb 2011 20:50:12 +0000

First of all, thank you for creating and maintaining such a great stockpile of information. I am looking to build a device for myself that boosts at least two different chains of effects. Would you recommend putting a booster before the splitter or giving each output its own independent boost? Would it make a difference?

By: hozone

hozone — Sun, 18 Jul 2010 12:52:52 +0000

thank you!

i prefer to build a buffer, because i also have long cables.
i’ve see read your documentation about buffers.
if i understaind, i can built a buffer / splitter even with BJT (like 2SC1815), because of the low impendance.
i’ve just to change R1 to 1M, R2 and R3 to 220k is that right?

By: admin

admin — Sun, 18 Jul 2010 12:31:25 +0000

Output impedance of your pedalboard is 1k or less, so you do not need a buffer/splitter.

Just use a Y-cord and connect the pedalboard to your line and monitor inputs. If they are rated at 10k input impedance or higher, there should be not problem.

If you would like to build the splitter anyway, it should work well in your application.

-Jack

By: hozone

hozone — Thu, 15 Jul 2010 18:52:40 +0000

hello,
first thank you for this buffer!
i’ve readlized it and works perfect!!

now i’ve a question:
i would like to split the signal coming out from my pedal board (zoom g7.1ut), to put it both
1 – in a line level input and
2 – in a monitor line level input.

those are the specifications of the output of the pedal board:
* Rated output level: -10 dBm/ 4 dBm (switchable)
* Maximum output level: 19 dBm (into load impedance of 10 kilohms or more)
* Output impedance: 1 kilohm or less
now i use the 4dBm level and get into a mixer line level in, and i works good.

i would like to know if is this buffer will work good as a signal splitter for this type of line level.

thanks,
hOZONE

By: admin

admin — Wed, 12 Sep 2007 00:57:34 +0000

Yes, it's supposed to be common drain. My slipup in terminology! Thanks for pointing it out; I'll edit it shortly.

regards, Jack

By: gaussmarkov

gaussmarkov — Tue, 11 Sep 2007 22:27:41 +0000

hi! thanks for your many contributions to understanding stompboxes. i wasn't sure where to write -- and this seemed as good as any. in your Basic Buffers article, you refer to this JFET buffer as a "common source amplifier." but in a wikipedia article, it is called a common drain or "source follower." what is the proper term? thanks, gm