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Synergy "Active" Crossover

Posted 6th April 2010 at 12:38 PM by wintermute (Wintermutes Rantings)
Updated 5th January 2011 at 02:18 AM by wintermute (fixed a couple of typos, and added a small amount of clarification.)

Following on from YARPS I thought I would post the design I have been working on for my active crossover (which is in fact is what the YARPS power supply was designed to drive).

So here I present the Synergy "Active" Crossover. Please note I have only simmed it at this stage (and when I started I knew nothing about active filter design) so there is no guarantee it will work.

Why have I put "Active" in quotes? Because whilst this filter uses active components, for all intents and purposes it behaves like a passive filter. It basically emulates either an LC or a CL passive 2nd order filter.

Why the name Synergy? Well I though it was the best word to describe the differing technologies working together to give the end result

The design goal is to have an active crossover that for all intents and purposes is transparent. That is it does nothing other than split the frequencies at the desired crossover point....
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duncan amps PSU designer

Posted 1st April 2010 at 12:56 PM by klewis
Updated 28th August 2010 at 02:41 PM by klewis

http://www.duncanamps.com/psud2/index.html

Bill's post on LCL power supply approach: post #1108
http://www.diyaudio.com/forums/power...lator-111.html
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my blog with live.com sharing my hi-fi tweaks...

Posted 30th March 2010 at 12:51 PM by takkiechu

http://hi-fiplanet-888.spaces.live.com/?lc=15369

You guys may download an article which I've put down tweaks for sharing with all audiophiles.

http://cid-d48d1ea0d5766c81.skydrive...uments?lc=1033
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cordells bias spreader

Posted 30th March 2010 at 02:05 AM by klewis

see post 519,520

http://www.diyaudio.com/forums/solid...altrak-52.html
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music and equipment reviews

Posted 29th March 2010 at 08:28 PM by klewis

hi fi nervana

music reviews, equipment reviews.

M2Tech HiFace USB – jkeny modded | TírNaHiFi.org
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speaker projects

Posted 29th March 2010 at 08:00 PM by MisterTwister
Updated 29th March 2010 at 08:14 PM by MisterTwister

I decided to consolidate most of my projects in one page. Twisterspeakers DIY loudspeaker projects
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Ohms Law Calculator

Posted 29th March 2010 at 03:02 PM by klewis

http://www.sengpielaudio.com/calculator-ohmslaw.htm
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Calculate for resistors in Parallel

Posted 29th March 2010 at 02:58 PM by klewis

http://www.sengpielaudio.com/calculator-paralresist.htm
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Rating: 2 votes, 4.00 average.

DAC End 2

Posted 29th March 2010 at 01:33 AM by quanghao
Updated 29th March 2010 at 02:16 AM by quanghao

INTRODUCTION

After the good result obtain with the DAC End I have design with Nguyen Quang Hao a set of boards to create a cheaper project with a sonic performances very near.

The No Oversampling DAC give a more natural sound but if you ear the TDA1541 and TDA1543 seem to lose details.

The AD1865N-K with passive I/V give a perfect combination, natural sound and all the details.

The AD1865N-K give the better performances with a 200ohm MK132 Caddock as passive I/V.

In this configuration the output signal is too low to drive any amplifier so I have design for the AD1865N-K the better output stage.

This DAC use a single ended vacuum tube amplifier without the expensive output transformers used in my original DAC End.

The DAC board follows the original design but has been inserted a jump to switch the phase of output signal.

In any vacuum tube stage the signal on the anode is in out phase...
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First spider done.

Posted 27th March 2010 at 06:40 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 14th February 2011 at 06:51 PM by Bas Horneman

The Takman resistors have thick copper wires. This makes for wonderfully strong little spiders.

I've also used ceramic terminals strips for the first time and it makes for a nice strong construction.

And I did the ccs for the phase splitter a while ago.

[edit] I used silver solder. But found out that it is NOT necessary with these fakes. Fake or not it make for a great construction.

"TEKTRONIX CERAMIC STRIPS, HISTORY and GENERAL INFORMATION
Tektronix first developed and used ceramic strips in their oscilloscopes in 1952. During the manufacturing process, silver in liquid form is painted in and on the notches of the strips prior to the application of the final glaze and final firing. The silver is then firmly bonded to the ceramic and wires can be soldered directly to the ceramic.

Special silver-bearing solder should be used when soldering to ceramic strips so the silver bonded to the strip does not...
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