AMZ Buffer/splitter

4/10/2014

11 Comments

Here's a small little circuit that I have had lots of uses from.

A couple of Buffer/splitter for the studio.

11 Comments

Damian

3/29/2020 03:17:38 pm

Hello Fredrik,
Do You perhaps know if I could use such splitter to split signal from guitar to guitar amp (thru analog pedals) and to standard guitar interface?
Thx in advance!

Tyler

5/31/2020 09:15:09 am

Hey, is q2 a 201 as well?

Fredrik Lyxzén link

6/1/2020 04:15:04 am

Hi Tyler,
Yes. Both transistors are J201.

Juanito

8/23/2020 12:25:14 am

Can I put potentiometers for volume control for each out, where?

Fredrik Lyxzén link

9/1/2020 04:48:22 am

Yes, of couse. Just put a potentiometer at every output, just as you would on any stripboard effect layout - output to pin 3, pin 1 to ground, pin 2 to tip of the output jack.

Guga Brandão

2/4/2022 07:16:46 pm

Can you tell the pot value? Thanks!

Guga Brandão

1/17/2022 08:54:24 pm

Hello, my friend! Can I use piezo (in my case, graphtech ghost saddle) as the input? Thanks!!

Guga Brandão

2/5/2022 02:07:58 pm

I did it. Using to split piezo pickups... Working like a charm. Now, I'm trying to use the Tillman Preamp, because the piezos need some pre gain.

Guga Brandão

2/5/2022 02:17:06 pm

I've built the buffer/splitter to use with my graphtech ghost saddle piezos and it's working like a charm.. But now I'm thinking to use the Tillman Preamp after the AMZ buffer/splitter and before my FX chain.. But I'm with one doubt here about the impedance matching. This AMZ splitter/buffer uses high input impedance with low output impedance, right? So, the Tillman Preamp uses exactly alike, high input impedance and low output impedance. I need to use the splitter before the preamp, but the impedances wouldn't match... Anyone here could help me how to match them? Maybe the splitter with high output impedance, or the preamp with low input.. How could them work together?

Sorry about my rusty English! Greetings from Brazil!

Guga Brandão

2/5/2022 11:15:33 pm

Well, even without answers here, I found an excellent article at AMZ, called "Pedal Impedance - The In and Out of Impedance, and the final words are pretty conclusive, saying: "In general, the ideal situation is to have a low output impedance connected to a high input impedance in order to pass the best fidelity signal across the audio frequency band. A unity gain buffer, which has a high input and low output Z, will sometimes be used as a line driver to preserve the full frequency response of the signal.'

So, I think my doubt about the impedance matching between the AMZ buffer/splitter and the Tillman Preamp is answered, don't you think? I'm gonna try to use this little 3dB gain with the Tillman's unity, so I can achieve a proper preamp level before my pedals.

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AMZ Buffer/splitter

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