Simplistic NJFET RIAA - Page 599 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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
Reply
 
Thread Tools Search this Thread
Old 24th March 2011, 04:39 AM   #5981
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Quote:
Originally Posted by taniknight View Post
I just bought a Tascam 58 8 track to experiment with... but that's certainly for another thread (sorry about all this nonsense Salas).

Google just taught me about Fi Audio... I guess you mean this one.

I'm working through some unusual chassis designs myself as this is probably what I'd be best at and also an area that I see is usually lacking in DIY builds. Cake tins are quaint and all, but if you are going to claim that something is as good as a $$$ unit, it should sorta look like it. Peter Daniels is on to it. Something that makes artistic sounds should look artistic to complete the picture.

Anyway, Salas, your Simplistic is great and I look forward to hearing the Itch. Maybe one day they will both make it into the kick-a$$ DJ console I'm working on (slowly).

Tani.
Hi Tani

I'm sure chassis design is a cool topic for any build thread.

Don Garber def. turns chassis design on it's head.
The constants, such as sheilding etc. remain the same, but plenty of scope is there for leftfield configurations.

My chassis are now (pre Don Garber) always built out of scrap & very leftfield parts, but adhering to good electrical principles.

Sometimes recycled material can yield a result which would otherwise be unexpected.

Obviously it must sound good, but if it looks cool it's a bonus.

Cheers

Simon
  Reply With Quote
Old 24th March 2011, 05:30 AM   #5982
diyAudio Member
 
kstlfido's Avatar
 
Join Date: Mar 2006
Location: Berkeley, CA
Default Power supplies

I am gathering parts for the 1.2R shunt and the pre-shunt filter.

A while back, SGregory spelled out his filter, no schematic. I made a schematic of it, attached. How does it look? SGregory, care to comment? Does one need that many uF's to adequately pre-filter?!?

As for the shunt, I hear C1 (4.7uF) quality is critical; C3 less so. I have 2 Wima MKP 4.7uF's. But as they are 400v, I was hoping to save them for valve use. Would good PIO's be OK instead?

-Kent
Attached Images
File Type: gif SG-pre-shunt-filter.gif (16.8 KB, 192 views)
  Reply With Quote
Old 24th March 2011, 07:10 AM   #5983
diyAudio Member
 
kstlfido's Avatar
 
Join Date: Mar 2006
Location: Berkeley, CA
Default Resistor questions regarding 1.2R shunt

Sorry for more questions...

Are ordinary metal film resistors fine to use? I've got a good collection of the pale blue 1% types.

It looks like I can use 1/2 watt for all except for R1, which I will use a 1W resistor.

Cheers- Kent
  Reply With Quote
Old 24th March 2011, 09:54 AM   #5984
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by Salas View Post
Its essentially flat there with 33nF or 47nF too and you cut more around disc warp. Just test your 47n. You will find even 22n FT-1 very much passable with your now output caps and preamp load I believe with the real bass that is actually to be found in most records.
Thanks for the input Nick, I have to take a compromise point because my loudspeakers can't go well till 50-60Hz but my headphones go till 12Hz so I will follow your advice & first I will try with 47nF to see what's happen.
  Reply With Quote
Old 24th March 2011, 11:15 AM   #5985
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by kstlfido View Post
for the 1.2R shunt and the pre-shunt filter..........I made a schematic of it, attached. How does it look?
The rCLcLC PSU would work pretty well feeding straight into a the RIAA stage. You have ~25mF and two inductors in there for good ripple and interference attenuation.

You are going to use a Shunt regulator between the PSU and the RIAA. I think you can cut back significantly on the cost/bulk of the PSU.

That little 1nF in the middle seems a nice touch. Another (or bigger) across the secondary and across the primary might give even more attenuation.
__________________
regards Andrew T.
  Reply With Quote
Old 24th March 2011, 12:59 PM   #5986
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by kstlfido View Post
Sorry for more questions...

Are ordinary metal film resistors fine to use? I've got a good collection of the pale blue 1% types.

It looks like I can use 1/2 watt for all except for R1, which I will use a 1W resistor.

Cheers- Kent
Yes ordinary MF 1% are fine. R1 1W.
  Reply With Quote
Old 24th March 2011, 01:38 PM   #5987
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Hey Nick, with the new 47nF teflon U.S.A. sounds better than with 100nF FT-3 russian teflons & you are right I need 33nF or 22nF to cut more down the lows

Last edited by merlin el mago; 24th March 2011 at 02:00 PM.
  Reply With Quote
Old 24th March 2011, 01:42 PM   #5988
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
You see, never say never.
  Reply With Quote
Old 24th March 2011, 02:05 PM   #5989
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by Salas View Post
You see, never say never.
BTW USA teflon caps 200VDC are far better than russian teflon caps 600VDC
  Reply With Quote
Old 24th March 2011, 02:15 PM   #5990
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by merlin el mago View Post
USA teflon caps 200VDC are far better than russian teflon caps 600VDC
USA in capitals and Russian starting with lower case ! Why?

On which parameters are you basing your conclusion?

I'll re-write that sentence to get the meaning over to you.

On which parameters are you basing your erroneous conclusion?
__________________
regards Andrew T.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 07:06 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2