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peranders 15th October 2004 09:43 AM

Sjöström Diamond Buffer group buy
At the moment there are a couple of Diamond buffer pcb's, my QRV-05 , Glassman's, AMZ-FX's and even more (somebody may fresh up my memory). All these implementations are different. 100% SMD, 90% SMD, 0% SMD, with cascodes and without.

First: I have absolutely no need for a diamond buffer

Second: This small deisgn is fun and easy to make good

Third: This is a small project, I like that.

Fourth: I feel like doing a good nice looking hole mounted pcb.

The design will be exactly as my QRV_05 but with both positive and negative current sources at the input, according to Bruno's input in this matter.

Design goal:

* High performance, best as possible, therefor usage of cascodes.

* Use as few different parts as possible

* All resistors 400 mils between pins (or do you prefer an even smaller pcb with standing resistors?)

* Three pairs of output transistors, consisting of TO92 types

* Pcb will be in a 4 pcs. panel.

How big may the pcb be? What is the limit?

What do you say?

roibm 19th October 2004 04:03 PM

Well, I got to ask this...
What are they good for and what is their advantage over other solutions? I read about headphone amps, can you descibe how they compare to other amps?


peranders 19th October 2004 04:22 PM

First of all: It's not an amplifier, OK an amplifier with the gain of nearly 1, 0.95-0.999. The main usage is to have it between an opamp or some other kind of amplifier with a weak output stage and a rather heavy load. The buffer can be used within or outside a feedback loop. The buffer has also current sources at the input for creating class A mode of the opamp.

digi01 22nd October 2004 06:52 AM

P-A,count me in.
If you work on proel,I am glad to work in teams with you.

peranders 14th September 2013 08:24 AM

This was on old thread but is there any interest for a group buy today? Back then the pcb was double sided, now the pcb has four layers and the size is nearly half the size.

Rudi_Ratlos 14th September 2013 01:19 PM

Per-Anders, please count me in for 2 PCBs.
Best regards - Rudi_Ratlos

markus22ch 14th September 2013 09:17 PM

Hi Per-Anders

i'm in for 4 boards, markus

tinitus 14th September 2013 09:50 PM

how about board and component kit ?

prices ?

jackh 14th September 2013 10:00 PM

I'll take 2 boards

peranders 15th September 2013 06:06 AM

tinitus, component kit is out of the question because it consumes a lot time and the parts are cheap and available for everyone.

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