Zen with lower voltage? - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 April 2004, 09:46 PM   #1
diyAudio Member
 
Join Date: Apr 2004
Location: Hamburg
Default Zen with lower voltage?

Hi,

I'm intending to build a "normal" Zen (i.e, no variation). However, the trouble begins even before I've touched anything: it seems rather difficult to get a 24 V transformator.
As I don't really need any particular amount of power, I assume I'd be fine with 18 V, which is what I can get. However, do I need to make any adjustments to the circuit, and if so, which?

Thanks everyone!

Jan
  Reply With Quote
Old 18th April 2004, 10:09 PM   #2
Banned
 
Join Date: Apr 2002
Location: Germany, Clausthal
http://www.schuro.de/preisl-se-rkt-2.htm
  Reply With Quote
Old 18th April 2004, 10:40 PM   #3
joensd is offline joensd  Germany
diyAudio Member
 
Join Date: Dec 2001
Location: Germany
Schuro is certainly a nice-priced "audio parts" shop.
Remember you could also take a transformer with two 12VAC secondaries which you can also get at Reichelt.
Reichelt has got very good prices as well but doesn´t stock the usual parts you need for your diy-projects (like bigger heatsinks or good quality pots).

Using a lower voltage transformer is of course an option as well if you don´t need the full output power.
  Reply With Quote
Old 18th April 2004, 11:29 PM   #4
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I have built Zens with 25 VDC (18 VAC) that worked fine,
but you have to accept the lower power. At the same time,
you can use more bias current.
  Reply With Quote
Old 19th April 2004, 04:24 AM   #5
azira is offline azira  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Near Seattle
My zen runs on a 24VDC transformer no problem. Works pretty well I think. No parts need to be changed either I think. I didn't follow the parts on the schematic exactly, however, I used bias resistor/pot combination that I could find onhand.
--
Danny
  Reply With Quote
Old 19th April 2004, 06:43 PM   #6
diyAudio Member
 
Join Date: Apr 2004
Location: Hamburg
Thanks to everyone who's replied! I'd like to answer each one, though I don't know how to deal witht his forum software. Hence I'll do it the pedestrian way.

till: I'd rather not buy from another supplier as that means postage again. Yes, I am cheap - or poor, depends on the definition of either.

joesd: I thought of using the 2 x 12 V transformer - I'd have to put the two taps in series, right?

Nelson: are any changes necessary to run it with 25 VDC?

Jan
  Reply With Quote
Old 19th April 2004, 07:05 PM   #7
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
I think Nelson means that you can run it as-is from 25VDC, but you can also raise the bias current for the same transistor heat dissipation because you're running from a lower voltage.
The Zen's not fussy, go for it.
  Reply With Quote
Old 19th April 2004, 07:27 PM   #8
diyAudio Member
 
Join Date: Apr 2004
Location: Hamburg
Hi paulb,
thanks for the clarification!

Jan
  Reply With Quote
Old 20th April 2004, 04:39 AM   #9
azira is offline azira  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Near Seattle
Quote:
Originally posted by paulb
I think Nelson means that you can run it as-is from 25VDC, but you can also raise the bias current for the same transistor heat dissipation because you're running from a lower voltage.
The Zen's not fussy, go for it.
Sorry, I didn't mean to imply that I changed any of the parts so that I could run it at a lower voltage. Virtually none of the parts (except the bias resistor) values are critical so I used what was onhand. You could do the same actually..
  Reply With Quote
Old 20th April 2004, 05:02 PM   #10
diyAudio Member
 
Join Date: Apr 2004
Location: Hamburg
Thanks again for the clarification.

I've just ordered the parts for a 2*12=24V system. Is it common/advisable/desired to put up info on how I progress as well as pictures?

Jan
  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
GM70 Lower Voltage PP Question Mush Tubes / Valves 3 3rd March 2010 11:36 PM
How to lower mains voltage using resistors johnm Tubes / Valves 14 13th June 2008 07:41 PM
Lower voltage LM386? DonFlamenco Chip Amps 1 6th September 2006 10:56 PM
Should I use high voltage value zeners or multiple lower voltage zeners in series? jarthel Parts 7 30th May 2006 04:56 PM
How to lower supply voltage avenger Chip Amps 18 24th November 2003 07:20 AM


New To Site? Need Help?

All times are GMT. The time now is 03:40 AM.


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