Having trouble building a power supply for a phono preamp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 3rd April 2003, 07:44 PM   #1
SideA is offline SideA  United States
diyAudio Member
 
Join Date: Apr 2003
Location: Lowell, MA
Send a message via AIM to SideA
Question Having trouble building a power supply for a phono preamp

Hello everyone!

I am building a phono preamp which requires a +/-15V power supply. I found a schematic for a +/-35V power supply and was told by a friend that the transformer can be replaced with another one and produce a voltage of +/-15V. Is this true? If so, what would be a suitable transformer to use, or else would I need to look for another schematic?

http://sound.westhost.com/project04.htm

Another question I have is in respect to the fact that the power supply is dual channel. If I am building a Minimized GainKlone, would there be a way to power both the preamp as well as the GainKlone with the schematic I have listed above?

Thanks for your time,
-Scott
  Reply With Quote
Old 4th April 2003, 06:34 AM   #2
vbd is offline vbd
diyAudio Member
 
Join Date: Jan 2002
Location: Grenoble, France
Hi, SideA
Yes, you can change the transformer secondary voltage to get 15V, around 11VAC, but then you have only unregulated voltage... Have a look at:
http://sound.westhost.com/project05.htm
This site is really a compilation of EVERY basic thing you need to know !
You could power the regulators from the power amp supply BUT take care of their max voltage input of 35V, it is probably wiser to add a "preregulator" with a zener diode, a resistor and a transistor (a simple series resistor could do the job )...
You may power both preamp channels with only one +/- 15V regulator, as the currents should be low.
You also may use better regulators such as LM317/337 with a few extra resistors...
Hope this helps
__________________
Denis
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
TubelabSE power supply trouble wicked1 Tubelab 26 14th December 2008 07:59 PM
Power supply for 12SL7 phono preamp HawkSpeed Tubes / Valves 28 25th June 2008 03:00 AM
In search of power supply schematic for phono preamp jduffy Tubes / Valves 16 9th April 2007 04:58 PM
GC Power Supply Trouble blackreplica Chip Amps 54 18th May 2004 03:07 PM


New To Site? Need Help?

All times are GMT. The time now is 09:13 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