CrystalFET Phono Stage - diyAudio
Go Back   Home > Forums > Blogs > RJM Audio Blog
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
If I put my notes here, I might be able to find them again later!
Rate this Entry

CrystalFET Phono Stage

Posted 3rd March 2016 at 04:55 AM by rjm
Updated 21st April 2017 at 01:46 AM by rjm

Development thread here. Web page here.

CrystalFET is a J113 jfet-based two-stage phono preamp, with passive equalization and on-board MOSFET-based shunt voltage regulator.

Jfets Q1 and Q3 should be matched between channels, and for best results the value of drain resistors R2 and R9 should be selected based on the jfet pinch off voltage of Q1 and Q3 respectively.

rev. 1.4e (final version) removes some unneeded resistors and tidies up the board layout a little. The resistors have been renumbered.
Attached Thumbnails
Click image for larger version

Name:	IMGP6761.jpg
Views:	513
Size:	263.9 KB
ID:	1889   Click image for larger version

Name:	IMGP6764.jpg
Views:	266
Size:	192.5 KB
ID:	1890   Click image for larger version

Name:	DSC_6236.jpg
Views:	271
Size:	262.8 KB
ID:	1897   Click image for larger version

Name:	crystalFET 1.3a response.png
Views:	198
Size:	22.7 KB
ID:	1934   Click image for larger version

Name:	pcb-crystal-14e-sch.png
Views:	434
Size:	18.3 KB
ID:	2007  

Click image for larger version

Name:	pcb-crystal-14e-brd.png
Views:	253
Size:	18.5 KB
ID:	2008   Click image for larger version

Name:	CrystalFET-14e.jpg
Views:	157
Size:	394.8 KB
ID:	2023  
Attached Files
File Type: zip pcb-crystal-14e-bom.zip (246.7 KB, 51 views)
File Type: asc Crystal 14.asc (11.2 KB, 149 views)
Total Comments 6

Comments

  1. Old Comment
    I am up for a giving the new stage a try. Let me know.
    Walt
    permalink
    Posted 3rd March 2016 at 11:37 PM by waltroman waltroman is offline
  2. Old Comment
    rjm's Avatar
    Thanks! I will order some boards soon whatever happens, just ... because I'll be ordering other stuff anyways. I'll be in touch.
    permalink
    Posted 4th March 2016 at 05:12 AM by rjm rjm is offline
  3. Old Comment
    Count me in also....
    permalink
    Posted 24th March 2016 at 05:28 PM by richandy richandy is offline
  4. Old Comment
    rjm's Avatar
    Boards arrive today. More soon.
    permalink
    Posted 25th March 2016 at 06:03 AM by rjm rjm is offline
  5. Old Comment
    How / where can I order the kit?
    permalink
    Posted 4th April 2016 at 05:08 PM by richandy richandy is offline
  6. Old Comment
    rjm's Avatar
    PM sent!
    permalink
    Posted 4th April 2016 at 11:35 PM by rjm rjm is offline
 
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 10:12 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