How to have a 48v+ on McCurdy preamp - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, 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
Thread Tools Search this Thread
Old 10th March 2009, 11:26 PM   #1
diyAudio Member
Join Date: Mar 2009
Default How to have a 48v+ on McCurdy preamp

Hello everyone,

Im a student in audiovisual and I have a big project to do so I would need a little help here..First of all, I'm a french canadian so please give clear information because my english is good but not so good hehe. Thank you.

So I have a DA501 pre amp from Mc Curdy and I need to do some modification on it to have a Phantom Power 48v+. To do that I need to do some modification on the power supply to have a 48v+ output. We have 47v RMS at the end of the power supply but we need 48v+ DC.

At some point,my teacher give us a hint by telling us we need a LM317 high voltage I think. Also he told us we need to know how much voltage is at the transfo to adjust the value of the resistor so we can get 48v+ DC.

I need to do some research but I'm actually very lost about this so if someone could help me out a little, it would be really appreciated. Maybe a explanation of what jo needs to be done to have 48v+ DC and explanation of the concept.

If you can give me some hint also of where to search, it would be usefull because I need to gather information but I'm completly lost in that project.

Thank you
  Reply With Quote
Old 11th March 2009, 08:00 PM   #2
diyAudio Member
Join Date: Mar 2009
Im sorry I made some mistake here...I have 47v at the end of the power supply but its not regulated for a Phantom power..

At the output of the transfo I have 46.5v

I still have to found a solution to bring 48v+ regulated in the power supply of the pre amp so I can add a Switch whit phantom power ...

Any ideas???
  Reply With Quote
Old 11th March 2009, 10:28 PM   #3
diyAudio Member
firechief's Avatar
Join Date: Sep 2008
Location: Near Seattle Wa
Number_Juan The hint that your teacher offered is a possibility. I suggest that you search for the data sheet for the part (LM317) and study it. Look at every parameter and find out what it means. Do you have a schematic for the decice in question? Gather data on each item, even if you dont know where it will take you. Data sheets often include examples. There are many ways to do this. The best solution should answer the question "what is important". Research today is so much easier that it was befor the net. Good luck
  Reply With Quote


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
Tube Preamp Popping on Source Input Change (?) / 6DJ8 Preamp On Chip Amps Travis Clarke Tubes / Valves 3 16th October 2008 04:52 AM
Guitar Preamp = MIC Preamp = other preamp ,,are they all same? Paswa Instruments and Amps 1 12th March 2008 05:16 PM
twisted pear Preamp/other suggestions for Preamp kit LukeDuke Chip Amps 1 1st February 2008 09:57 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM
wiring preamp outs on a preamp bonsai171 Solid State 4 22nd March 2004 10:13 PM

New To Site? Need Help?

All times are GMT. The time now is 01:07 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