Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

1V2 phono riaa preamplifier
1V2 phono riaa preamplifier
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 10th November 2018, 12:38 AM   #21
dreamth is offline dreamth  United Kingdom
diyAudio Member
 
Join Date: Nov 2010
This is how this thing should be looking like with a proper transformer...I'll make it again for the LT1638 version too.
Attached Images
File Type: png 1v2FB-1738-customTR.png (247.3 KB, 42 views)
  Reply With Quote
Old 10th November 2018, 03:46 AM   #22
dreamth is offline dreamth  United Kingdom
diyAudio Member
 
Join Date: Nov 2010
I finished now both schematic versions of the power supplies with the transformer that hopefully would solve all of my problems.I don't know if i can get it as a commercial product so most probably I'll have to wind it myself. Some of the values would need some tweaking and fine calculation or simulation, but the basic schematic should be good enough.

I chose the 20vdc supply just because i have lots of unused IBM and Dell laptop chargers and because of the efficiency vs safety reasons.
Attached Images
File Type: png RCH.png (179.0 KB, 36 views)
File Type: png LCH.png (177.5 KB, 34 views)
File Type: png 1v2FB-1738-customTR.png (247.3 KB, 31 views)
File Type: png 1v2FB-1683-customTR.png (241.9 KB, 30 views)
  Reply With Quote
Old 12th November 2018, 02:35 AM   #23
dreamth is offline dreamth  United Kingdom
diyAudio Member
 
Join Date: Nov 2010
As usual I forgot the fuse and the reversed voltage protection diode on the input and i thought that i should also add a very simple delay for the high voltage supply switch ON. I just copied one that i found somewhere on this forum. So i have a slow start for the filament and when the filament voltage reaches about 4.6v, the relay timer will start it's own countdown .The relay is a smd double relay(modem-tel) so that i can put it's contacts in series and lower the contacts stress although the relays are for a maximum of 110vdc-2amps while i have 140...250vdc but less than 50mA surge at any moment.
Attached Images
File Type: png 1738-temp+prot.png (233.7 KB, 6 views)
File Type: png 1738-temp+prot-detail.png (250.8 KB, 9 views)
  Reply With Quote
Old 12th November 2018, 01:55 PM   #24
dreamth is offline dreamth  United Kingdom
diyAudio Member
 
Join Date: Nov 2010
And , of course, the same mods were added on the LT1683 schematic.version.Time for PCB work now!
Attached Images
File Type: png 1683-temp+prot.png (240.3 KB, 5 views)
File Type: png 1683-temp-prot-detail.png (247.4 KB, 6 views)
  Reply With Quote

Reply


1V2 phono riaa preamplifierHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Le Pacific RIAA preamplifier Bellus Solid State 3 10th August 2016 07:03 AM
HN LB T10 Pro 6N2 tube valve Phono MM Turntable RIAA Preamp preamplifier Ver2.5 ALPUY Analogue Source 0 23rd June 2015 05:36 PM
RIAA preamplifier JPS64 Tubes / Valves 0 5th May 2011 07:36 PM
How Can I connect A Balanced RIAA Phono Pre-Amp to a Phono Plug amp input jmartinbaugh Analogue Source 3 25th April 2011 02:24 PM
LM833 RIAA Phono Preamplifier gmilitano Analogue Source 2 7th March 2005 06:26 AM


New To Site? Need Help?

All times are GMT. The time now is 06:56 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki