diyAudio - Entries for April 24, 2017
Go Back   Home > Forums > Blogs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Old

Sapphire 4 headphone amplifier [Rev. 4.1m]

Posted 24th April 2017 at 01:02 AM by rjm (RJM Audio Blog)
Updated 21st June 2017 at 09:17 AM by rjm

Development thread starts here.

While I consider this my best work to date, the documentation trail has become hopelessly scattered so let me try to regroup in this blog post and make some sort of gateway/portal to the project. [Update: web page write up now finished.]

The followup to the Sapphire 3 started out as a generic musing on stacked diamond buffers and current mirror amplification, coalesced for a bit as the ill-fated Project Unity before becoming part of the Sapphire line initially as a temporary measure as something I could drop in my existing chassis for testing. The first iteration kept the open loop buffer of previous Sapphire iterations, but now I'm running the 4.1m boards with the buffer inside the feedback loop I realize I've ended up at just the classic, dictionary definition current feedback amplifier (CFA). Sigh. So much for originality. It sounds great though, so I'm not as upset about it as I might have been.

*****...
Attached Thumbnails
Click image for larger version

Name:	pcb-sapphire-41m-brd.png
Views:	129
Size:	20.9 KB
ID:	2360   Click image for larger version

Name:	sapphire-41m.png
Views:	89
Size:	198.3 KB
ID:	2361   Click image for larger version

Name:	pcb-sapphire-41m-sch.png
Views:	231
Size:	20.4 KB
ID:	2362   Click image for larger version

Name:	DSC_1165s.jpg
Views:	154
Size:	203.3 KB
ID:	2363   Click image for larger version

Name:	DSC_1172s.jpg
Views:	127
Size:	386.5 KB
ID:	2364  

Click image for larger version

Name:	sapphire-41-ltspice R3X 15dB.png
Views:	120
Size:	83.5 KB
ID:	2376   Click image for larger version

Name:	summary.png
Views:	68
Size:	21.8 KB
ID:	2377  
Attached Files
File Type: zip pcb-sapphire-41m3-bom.zip (195.9 KB, 58 views)
File Type: asc Sapphire 41.asc (6.2 KB, 103 views)
rjm's Avatar
rjm
diyAudio Member
Views 458 Comments 3 rjm is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 05:39 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki