BUF634 as power source for Bugle? - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 18th August 2011, 12:10 PM   #1
diyAudio Member
 
Join Date: Jul 2011
Location: Oak Park, IL
Default BUF634 as power source for Bugle?

Has anyone tried this schematic from the Beavis HiFi site? It's part of his Kitchen Sink Phono Stage and I was wondering if it would be a good match for my Hagerman Bugle phono preamp. The Bugle runs fine on 2 9v batteries but this schematic looks interesting.

It's unverified and Dano is MIA.
Attached Images
File Type: png bufpwr.png (22.1 KB, 241 views)
  Reply With Quote
Old 19th August 2011, 12:42 AM   #2
diyAudio Member
 
Join Date: Sep 2010
Change all resistors to 10k. This will give lower noise and also save the LED.
Unless you are running off a battery, then you can keep the 220k resistors.

The 220uF capacitors at the output of the buffer are somewhat counter-productive. Rather increase the capacitance at the input side and let the buffer do its job.
  Reply With Quote
Old 19th August 2011, 01:03 AM   #3
MrSlim is offline MrSlim  Canada
diyAudio Member
 
Join Date: Jun 2009
Location: Ottawa, Ontario
Blog Entries: 2
Why not just use Hagerman's Power supply for the Bugle? It's probably more expensive, but a real ground always beats a virtual one, which is what you are creating with the BUF634.
  Reply With Quote
Old 19th August 2011, 02:09 AM   #4
diyAudio Member
 
Join Date: Jul 2011
Location: Oak Park, IL
Hagerman's power supply is fine but above my budget right now. The dual 9 volts do the job well enough for many Bugle users but I am intrigued with the idea of no batteries or traditional high voltage power supply.
  Reply With Quote
Old 19th August 2011, 03:08 AM   #5
MrSlim is offline MrSlim  Canada
diyAudio Member
 
Join Date: Jun 2009
Location: Ottawa, Ontario
Blog Entries: 2
Tangent has a really good writeup on virtual ground circuits here: Virtual Ground Circuits. The BUF634 circuit is mentioned(in a simplified form), along with several interesting alternatives. Regardless of the circuit, you will have to get a 24V(ish) DC wallwart to provide the source power, http://www.ebay.com/itm/BRAND-NEW-24...item3cbb21abe1 if you're not afraid of a switching supply..

Last edited by MrSlim; 19th August 2011 at 03:13 AM.
  Reply With Quote
Old 19th August 2011, 12:15 PM   #6
diyAudio Member
 
Join Date: Jul 2011
Location: Oak Park, IL
Hey thanks, MrSlim and discrete ! At the very least, it can provide some feedback on the pros and cons of this particular method. I'll post my results once my parts arrive and I get her up and running.
  Reply With Quote
Old 19th August 2011, 08:08 PM   #7
MrSlim is offline MrSlim  Canada
diyAudio Member
 
Join Date: Jun 2009
Location: Ottawa, Ontario
Blog Entries: 2
Great! Good luck with your experimentation..
  Reply With Quote
Old 20th August 2011, 03:38 AM   #8
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
I used basically the same circuit (which is shown in the LM675 datasheet at national.com), but with 35V in and an LM1875 in place of the BUF634. It worked very well for current up to about 1.5 Amps (which I happened to limit it to, in that case)

But why not just get two 12V wall adapters and connect the negative of one to the positive of the other? That connection would be your "ground", and the remaining positive and negative leads would be +12 and -12.

You have to make sure that you get the right type of wall adapters, for that. They have to be the common isolated type. I think that in the USA they would say "Type 1" on them, but can't quite be sure of that.

There is more information, here: Notes on the Troubleshooting and Repair of AC Adapters, Power Supplies, and Battery Packs, and Other Related Information

You could also add protection diodes (see the link above).

And you could add linear regulators.

Tom
  Reply With Quote
Old 27th August 2011, 12:47 PM   #9
diyAudio Member
 
Join Date: Jul 2011
Location: Oak Park, IL
Got my parts and I'm near completion. Just troubleshooting my panel mount 2.1 dc power jack - I get those pins goofed up rather often!


I'll post my findings hopefully this weekend if time permits.

And thanks gootee, that link is very useful for reference!
  Reply With Quote
Old 28th August 2011, 05:43 PM   #10
diyAudio Member
 
Join Date: Jul 2011
Location: Oak Park, IL
"We have Wormsign!"
Translation: The Kitchen Sink BUF 634 power supply (with modifications) is quite operational. Needs more testing ( my pioneer pl4 TT is acting touching, so while I have clear audio, it's slowwww due to a rotor issue).

Good news is nothing has blown up, no hiss or hum that I am aware of, and was a pretty easy build. I followed discrete's tips to the best of my ignorant capabilities: resistors are all 10k and I removed the 220 caps on the output. The input caps have been beefed up with 3 330uF caps in parallel (what I had available).

More testing needs to be done but so far, I feel this is a worthy candidate for a Bugle power supply. I'm sure there's something I'm not doing "right", but this alternative cost me around 25 to 30 bucks; a pretty good savings in my book. More later...
  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
Aleph Topology - Power Follower instead Common Source Power output ? tiefbassuebertr Pass Labs 1 26th June 2011 04:15 PM
Hagerman Bugle power-supply or for +/-15dc 100ma generic supply. tweakk Swap Meet 3 23rd February 2011 06:46 PM
New hagerman bugle+power-supply boards... tweakk Swap Meet 0 29th July 2010 04:43 PM
OPA637 - BUF634 power supply? AudioGeek Solid State 5 21st April 2010 08:14 PM
Bugle phono preamp with gain and source impedance adjustment. badduh Analogue Source 7 18th December 2009 07:51 AM


New To Site? Need Help?

All times are GMT. The time now is 05:15 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