Jens Rasmussen Leach clone group buy - Page 54 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Group Buys Members group buys

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 1st April 2008, 12:26 PM   #531
diyAudio Member
dudaindc's Avatar
Join Date: Sep 2005
Location: Metro Washington DC

I believe that Advanced Circuits does not charge tooling costs IF orders are placed after a prototype. In other words, tooling costs are part of the prototype boards.

  Reply With Quote
Old 2nd April 2008, 01:15 AM   #532
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
True, but at $85-95 each, minimum 5 it still works out less expensive to buy 4 x $33 specials to verify the layout and pay tooling.

Of course we could wait for them to offer a no tooling special to order.
  Reply With Quote
Old 2nd April 2008, 01:49 AM   #533
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
It turns out that AC is running a no tooling special this month. I'll get cracking on the prototypes. If we can get the boards proven out before the special ends we can save the tooing.
  Reply With Quote
Old 3rd April 2008, 04:20 PM   #534
diyAudio Member
Join Date: Jan 2008
Hi guys, this is my first time signing up on wiki page in regards to this project. I heard that this project of Jens is really good with the combination of his active filter design and that got my attention. I want to do some experimentation. BTW, where do I send my payments for the board?
Can somebody walk me through how to adjust the Idle current on VR P101 and where to point my multimeter leads. I checked the delta audio website but I didn't fine this adjustment. I don't have a scope but I might buy one in the future. Sorry for the stupid question, I'm just a rookie. Thanks...
  Reply With Quote
Old 3rd April 2008, 09:51 PM   #535
diyAudio Member
Join Date: Apr 2007
A great deal on how to build this amplifier can be found at the Leach Low Tim amplifier site. It goes into detail on the original amp and the superamp, of which this group buy is part of.
When the pcb's become available after delivery from Advanced Circuits a notice will be placed in this thread. You will then be instructed to E-mail your full name, address, and any other necessary information to the person handling the group buy.
Most payments will be handled by Paypal, though money orders and western union will also work. upon receipt of payment the boards will be shipped out to you.
I started this current group buy for the original Jens 10 output pcb. It has grown to include this new layout. Bob Ellis, Jens have put a great deal of effort into getting this new design together.
Place your requested number of pcb's on the wiki and stay tuned things are happening fast now. Tad
  Reply With Quote
Old 3rd April 2008, 09:59 PM   #536
AJT is offline AJT  Philippines
diyAudio Moderator
AJT's Avatar
Join Date: May 2003
Location: Palatiw, Pasig City
we're getting there....
planet10 needs your help: Let's help Ruth and Dave...[B
  Reply With Quote
Old 3rd April 2008, 10:00 PM   #537
rob3262 is offline rob3262  United States
diyAudio Member
rob3262's Avatar
Join Date: Jan 2005
Location: southern New Hampshire
Originally posted by gtforme00
Is it possible to use the 10 transistor board, but only populate 2*N number of transistors? Say 4 if one needed a lower power amp, or 6, or 8?

That would make the decision of which board to use rather trivial.

An early post from this group buy - As it appears that the tweeter amp won't happen (and I'm fine with that), this is a good question for some.
Maybe somebody can comment on pros vs cons of 10 devices (overkill) for a tweeter amplifier. My biggest concern would be noise at idle (as I listen to my NAD 216's hissing away).

If there are no real cons to using all ten devices, I can't imagine cost would stop me from populating the board fully.

Scientific Principle and Common Sense
  Reply With Quote
Old 4th April 2008, 12:16 AM   #538
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
I ordered a set of boards with the $33 special that include the front end and extended (standard) output stage. Jens put both on a single panel. The super output and front end just barely exceeds the $33 special board size limit.

I'll try to get the super Leach output stage ordered next week.

I don't have time, so I need a volunteer to build up a board to verify that it works as designed. A scope and signal generator would be helpful to check for oscillations and square wave response. PM me please.
  Reply With Quote
Old 4th April 2008, 07:40 AM   #539
diyAudio Member
Join Date: Jun 2006
where can we look at final pcbs
  Reply With Quote
Old 4th April 2008, 09:59 AM   #540
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
Click the image to open in full size. is the most recent image that Jens has posted. I'll try to get a clean copy of the layout to post.
  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
WTB:2 boards from Jens Rasmussen Leach clone group buy mpmarino Swap Meet 0 12th January 2009 11:53 AM

New To Site? Need Help?

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