Is regulated PSU for phono preamp a MUST? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

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
Reply
 
Thread Tools Search this Thread
Old 4th April 2005, 03:09 PM   #1
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Question Is regulated PSU for phono preamp a MUST?

Can I use CLC PSU with a DC output wallwart instead?

Thanks in advance,

The Butcher
  Reply With Quote
Old 4th April 2005, 04:57 PM   #2
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Can I use CLC PSU with a DC output wallwart instead?
To power what exactly?
  Reply With Quote
Old 4th April 2005, 06:34 PM   #3
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Quote:
Originally posted by analog_sa


To power what exactly?

Solid state phono preamp using OP637 Left channel input from turn table left output then the OPA637 phono preamp output into left input Solid state line stage pre-amp the output to active crossover the output to power amps.

Another OPA637 will do the same but for the right channel this time.

Thanks in advance,
The Butcher
  Reply With Quote
Old 4th April 2005, 08:20 PM   #4
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
This vague description probably means you won't be dealing with low output moving coil carts. In this case regulation is not really a must as far as noise from the PS is concerned. The sound will, of course, be different depending on the PS arrangement. IME a good regulator (not a 78**/317) brings nice improvements in many areas.
  Reply With Quote
Old 5th April 2005, 12:48 AM   #5
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Ah, is the pick up you were questioning..

To keep the cost down I will stay with moving magnets cartridges. The only regulated PSU that I am capable of making would be the 7812/7815 or LM338K ones, any other ones I have no clue. But CLC I am very confident with and I like CLC because they are easy to make and runs cool no heat sink worries.

When people use lead batteries for the phono preamp PSU do they regulate it too?

Regards,
The Butcher
  Reply With Quote
Old 10th April 2005, 02:19 AM   #6
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
Really a "wall mart wall wart" (lol) is not going to do it ! it came from wall mart so the components inside are probably fakes and it will catch fire and burn your house down.

after that happens none of the othere reasons not to use a wall mart wall wart even matter </joking>

seriously though, most crappy DC wall warts are half wave rectified with minimal capacitor, and assume the device being powered has a regulator. (and they do not often come bipolar.

AC wall wart on the other hand is just a transformer and you do the rectifier/smoothing/regulation your self. it might be nice if you want to make a really tiny project.


look at this
http://sound.westhost.com/project05.htm it might be a better way to go.
  Reply With Quote
Old 10th April 2005, 03:32 AM   #7
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
http://www.alw.audio.dsl.pipex.com/jung_schematic.htm

http://www.aoselectronics.com/jungsrpcb.html

http://home.comcast.net/~walt-jung/w...ed_PN_Regs.pdf

will transform op amp based circuits. The AOS boards are a bargain! As ALW has eluded to, the Jung Super Regulator is a clear step superior to the Sulzer type circuit.

IMO, these are the steps

Passive, no reg
Zener based
Capacitance multiplier
78XX, 79XX
317/337
LT108X
Sulzer
Jung Super Regulators.

Take your pick, each progression wil have greater transparency, depth and micro dynamics.

Take A pair of super regulators from AOS
Combine with
http://www.sound.westhost.com/project06.htm
and you have a ready to go project that should sound very good with the OPA637 you've chosen.
  Reply With Quote
Old 10th April 2005, 01:17 PM   #8
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Default So Super Regulator is going to be then

I am going to use this thread to record my Phono Preamp Project. After reading this forum I have picked this preamp as my project. I am building from this schematic by refer to the thread http://www.diyaudio.com/forums/showt...426#post300426

For those of you who know the Butcher style should aware of the fact that appearance of electronics have no bearing here. I just want every penny that I spent on my projects get its return on the audio performance as my preference rather than the look of it. When it works then I will think of a slightly better case for them.

I already have all the parts on hand for the phono preamp as posted in the schematic from fastcat95. Now with Mikett's suggestion I am going to get some AOS boards. My next task is to compile a BOM for the power supply. I am thinking to do a mono block phone preamp so I am going to have 2 power transformers one for each channel. Each channel will have to use 2 super regulator PCB, one for positive and one for negative so I need to order 4 PCB boards. From their site I can compile a list of parts base on the negative and positive schematics.

The BOM for the PSU will get updated as the project progresses:
2 @ power transfomers 12-0-12 VCT 1A
4 @ Super Regulator pcb
2 @ panel mount power recepticles
2 @ power cords
2 @ panel mount power switches
2 @ inline fuse holders
2 @ slow blow fuses rate a 500ma

The Butcher
  Reply With Quote
Old 10th April 2005, 01:28 PM   #9
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Default Forgot to mention the pre-pre-pre amprefier

I was given a old MM cartridge (used for 1 month and is free). The phono preamp will be built base on this loading:-

PEARL
Moving Magnet
Stylus Type: 0.2 x 0.8 mil. Elliptical Configuration.
Frequency Response: 12 Hz. - 30 kHz.
Output Voltage: 5.0 mV per channel at 1 kHz.; 5 cm./sec. peak recorded velocity. Output from each channel within 2 dB.
Channel Separation: Minimum 30 dB at 1 kHz.
Channel Balance: Within 0.5 dB.
Compliance: 15 x 10-6 cm/dyne.
Optimum Load: 47, 000 ohms resistance in parallel with 250 to picofarads total capacitance.
Tracking Force Range: 1.5 to 2.0 grams.
Recommended Tracking Force: 2.0 grams.
Net Weight: 6.0 grams.
Mounting: Standard 1/2" (12.7mm) Mounting Centers.
User Replaceable Stylus RS-PEA
"Moving magnet phono cartridge with alloy cantilever, bonded elliptical stylus and 4.0mV output


The Butcher
  Reply With Quote
Old 10th April 2005, 04:22 PM   #10
Mikett is offline Mikett  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Toronto
PartsExpress has a 28VCT toroid in their buyout for $5 USD
  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
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM
PSU for a Gram-amp phono? Regulated or not? Aleksunder Solid State 4 31st July 2007 03:48 PM
Regulated PSU for Preamp bostonflyer Chip Amps 14 30th August 2005 12:49 PM


New To Site? Need Help?

All times are GMT. The time now is 02:16 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