Where do I start? - Page 2 - 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 27th August 2004, 12:47 AM   #11
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
My advice is that you not be concerned about hitting
the bullseye out of the gate (I love to mix my metaphors).

Pick Anything and go ahead and do it. Don't imagine that
any project will be your final effort. Have fun with it, and don't
be afraid of anything, espeshally miskates.

Join the Fearless Do-It-Yourselfers and have a nice life.

  Reply With Quote
Old 27th August 2004, 06:48 AM   #12
diyAudio Member
 
GeorgeBoles's Avatar
 
Join Date: Mar 2004
Location: Australia
Default Thx to Nelson and Anorgan (!)

Thanks for the advice, Nelson and Anorgan.

This whole intellectual exercise started when I was looking for affordable high quality amplification for the tweeter or tweeter/midrange for an (as yet non-existent) active 3-way system. I was thinking about covering the bass driver with my current amp or making a 100 - 200 watt kit from Electronics Australia magazine or Silicon Chip magazine (lots of muscle, not much finesse.) The crossover was to be a Silicon Chip TL074-based Linkwitz-Riley (?) jobbie.

I am vacillating because:

1. I am a vacillator at heart: paralysis by analysis.

2. The cost of heatsinks and transformers. (As far as I can tell there is no such thing as an electrical/electronics "disposal" shop over here.)

3. If I wish to change track or improve on any current effort, the transformers are likely to be unusable (i.e. wrong voltage/inadequate wattage) and, if I re-use the heatsinks too many times, they will be so full of holes that a transistor would not sit flat or efficiently thereon. (Nelson, I had even thought about building a selection of your project "series" of Zen's perhaps proceeding onto an Aleph something-or-other, recycling the expensive parts, but the transformer problem was likely to prevent that.)

4. WAF, time involved, bringing up children, Real Life, etc.

QUESTION: Is there a solution to the apparent requirement for a myriad of various transformer voltages for this vast array of projects? I guess I could just start building, and after about three projects I would have a "full set" of transformers if I purchased 500 VA ones from the start.

Oh, one more thing which I must say, although said before: your generosity, Nelson, in putting up your ideas of all sorts for us to study and play with is, I think, stunning. And then to put up for public perusal details of recently commercial products is ... bigger than stunning! It certainly helps this little home-body with his plans for better stereo, which may one day come to fruition.

Forever cogitating,
George Boles.

PS... I tell a mistruth. It all started when I walked into a hifi shop after some "affordable stereo shopping", and asked if I could listen to their B&W802's. (They powered them with Macintosh solid state amps). I was flabbergasted - and nearly wept with frustration - at how GOOD they sounded, especially how rock solid and precise the stereo image was. However, knowing my wife's thoughts about even a vastly reduced price on the 802's, have decided I must try to get something like it through DIY. (My current system is 20 - 25 years old, so I have a level of wifely approval to upgrade to something "smaller" .... might have to ignore that last little bit. Sorry dear. )
  Reply With Quote
Old 27th August 2004, 03:01 PM   #13
eLarson is offline eLarson  United States
diyAudio Member
 
eLarson's Avatar
 
Join Date: Aug 2002
Location: Gaithersburg, MD
Build the Balanced Zen Linestage (also known as BOSOZ: The Bride of Son of Zen). You will not be dissapointed. You also don't particularly need heatsinks... at least not the big aluminum extrusions, nor do you need a really large transformer.

I built one point to point over a weekend and have been pleased as can be with the results.

The good news is that you can drive just about any amplifier you may already have. Mine has seen time with a B&K ST140 and a pair of Exposure XVIII monoblocks. Next it will be drive... well, whatever I end up building. Maybe a bridged Zen-Lite?
__________________
Would a woodchuck bother to chuck MDF?
  Reply With Quote
Old 27th August 2004, 04:53 PM   #14
Anorgan is offline Anorgan  Croatia
diyAudio Member
 
Anorgan's Avatar
 
Join Date: Jul 2003
Location: Croatia
"QUESTION: Is there a solution to the apparent requirement for a myriad of various transformer voltages for this vast array of projects? I guess I could just start building, and after about three projects I would have a "full set" of transformers if I purchased 500 VA ones from the start."

Order a specialy made toroid with a spectrum of voltages like: 9,15, 25, 38, 60, 150, 250. Make it 1000VA. I'm ordering that one in a few weeks. With it you can try out various amplifier projects, even those using tubes. It'll cost me about 150. So it's not that expensive for an trafo for everything . Do a research of what projects you want to try out (include Leech amp!), and see what voltages you need.
  Reply With Quote
Old 28th August 2004, 11:31 AM   #15
diyAudio Member
 
GeorgeBoles's Avatar
 
Join Date: Mar 2004
Location: Australia
Default GeorgeBoles

Hello again Anorgan.

Actually, the thought of a multivoltage transformer had crossed my mind, but I did not know that such a beast existed. Good idea.

eLarson,

Thanks for advice. I downloaded the Balanced Zen Linestage and given other similar advice, I think it will be my planned pre-amp. The big heatsinks still will be necessary for a main amp though!

Regards,
George.
  Reply With Quote
Old 28th August 2004, 01:27 PM   #16
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Hi George,

Since you're in Australia, you may want to consider
Conrad for heatsinks:

http://www.conradheatsinks.com/welcome.htm

The Aleph30 may also be a good project.

Cheers,
Dennis
  Reply With Quote
Old 30th August 2004, 06:50 AM   #17
diyAudio Member
 
GeorgeBoles's Avatar
 
Join Date: Mar 2004
Location: Australia
Default Aleph 30/ Conrad

Dear Dennis,

1. What are the advantages/disadvantages of Aleph 30. It is not written about that much.

2. Conrad heatsinks look simple, elegant and thoughtfully constructed. I imagine though that I would have to get them to make specials, though, which they would do for a fee, of course.

Their most efficient is quite small (350mm long * 150mm high) and dissipates only about 0.2degreesC/Watt, (i.e. enough for a Zen 4 in the tropics!)

Regards,
Mark W.
  Reply With Quote
Old 30th August 2004, 11:28 AM   #18
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Default Re: Aleph 30/ Conrad

Quote:
Originally posted by GeorgeBoles

1. What are the advantages/disadvantages of Aleph 30. It is not written about that much.

The A30 is a slightly modified A3 and takes advantage of the Bosoz's
XLR output. Since its power level is roughly that of a ZV4, I thought
I'd mention it.

Quote:

2. Conrad heatsinks look simple, elegant and thoughtfully constructed. I imagine though that I would have to get them to make specials, though, which they would do for a fee, of course.

Their most efficient is quite small (350mm long * 150mm high) and dissipates only about 0.2degreesC/Watt, (i.e. enough for a Zen 4 in the tropics!)

Regards,
Mark W.
Do you have some special heatsink requirements?

The Conrad heatsinks look very nice and I've seen nothing but
positive comments on them. Too bad it's probably too expensive
to ship them to Canada...

Cheers,
Dennis
  Reply With Quote
Old 30th August 2004, 01:27 PM   #19
diyAudio Member
 
GeorgeBoles's Avatar
 
Join Date: Mar 2004
Location: Australia
Default Heatsinks

Hello Dennis,

1. My heatsink requirements are the same as anyone elses except that my ambient temperature is not 20 degrees Celsius but 35 degrees Celsius in summer in my lounge room. So if I want to keep the Mosfets lasting that bit longer I need bigger heat sinks.

The largest of the standard heatsinks they sell would only just keep the mosfets of a Zen 4 at the temperatures that Nelson P. recommends.

2. I presume that the A 3 you are talking about is the Aleph 3. (Still not fully conversant with all the abbreviations you use here.)

A BOSOZ/BZLS pre-amp is actually on my hit list and a balanced Aleph 3 would, I imagine keep me contented for quite a long time.

Regards,
GB
  Reply With Quote
Old 30th August 2004, 03:19 PM   #20
macka2 is offline macka2  United States
diyAudio Member
 
Join Date: May 2004
Location: USA
George check out passdiy.com gallery.

I use Conrad heatsinks exclusively on multiples of 2 of the largest per amp...they keep the listening room cosy.

Good value transformers are available from Harbuch Electronics.

The Zen series are the least efficient except for the latter versions.

The Aleph 30 or 60 would be my recommendation for sound/practicality or for diy the Zen Enlightenment.

Ian
  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
ESL - Where does one start??? darcangelo Planars & Exotics 23 19th December 2014 06:54 PM
Where to start? mattmcl Chip Amps 3 18th May 2009 08:49 AM
Will start my new Gainclone from Start, Need Help samsagaz Chip Amps 4 27th May 2008 10:39 AM
Where do I start? twowheeled Subwoofers 18 10th January 2008 04:52 AM
where to start?! samsagaz Solid State 1 30th August 2004 06:30 AM


New To Site? Need Help?

All times are GMT. The time now is 05:19 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