
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
Planars & Exotics ESL's, planars, and alternative technologies 

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 
28th April 2011, 09:36 AM  #11 
diyAudio Member
Join Date: Mar 2004
Location: Budapest, Hungary

Check also Quad ESL Dummy Load

29th April 2011, 01:23 AM  #12 
diyAudio Member
Join Date: Jun 2005
Location: Fort Worth, Texas


29th April 2011, 06:19 PM  #13  
diyAudio Member
Join Date: Jun 2005
Location: Fort Worth, Texas

Quote:
Lower left plot shows impedance magnitude and phase. Lower right plot shows normalized output response of voltage applied to ESL stators. Upper right plot shows the impedance vector diagram for marker frequency. Note that Rc(core losses) and Lp(primary inductance) are in reality a function of input voltage magnitude and frequency. In this spreadsheet they are constants. So not perfect modeling, but pretty good. Rc is not specified in the Plitron data. I estimated it at 500 ohm. This sets the peak magnitude of the impedance peak for the parallel resonance between Lp and (Cw + Cesl)*N^2. Pic #1: Plitron 4314 with 1000pF ESL and recommended Rdamp = 0.8 ohm You can see that the impedance and response match well with page 2 of the Plitron data sheet. Pic #2: Plitron 4314 with 1000pF ESL and Rdamp = 0.2 ohm The recommend value of 0.8 ohm gives you a maximally flat HF electrical response(stator voltages). If a lower value is chosen for Rdamp, the underdamped series resonance between LL and (Cw + Cesl)*N^2 causes a peak in the HF response. Also note that HF impedance drops and the phase angle gets even more negative (ie capacitive) in the top two octaves. Pic #3: Plitron 4314 with 1000pF ESL and Rdamp = 1.5 ohm If a higher value is chosen (Rdamp = 1.5 ohm) the HF electrical response droops a bit. But, since the native response of an ESL is a rising response (+3dB/oct for line source, +6dB/oct for point source) this is actually closer to the value needed for a flat acoustic response. Not that the minimum impedance has risen and the phase angle is reduced. Pic #4: Plitron 4314 with 1000pF ESL and Rdamp = 1.5 ohm, Rshunt = 16 ohm Adding a shunt resistance before Rdamp does not change the response. But, it does make the impedance load the amplifier sees more resistive. If used, this resistor would need to be able to dissipate considerable power/heat. Like before, the spreadsheet does use complex variable functions, so you will need to load the Analysis Toolpak Addin before it will work properly. 

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
esl electronics kit?  taichiguy  Planars & Exotics  6  26th March 2006 09:27 PM 
I know [almost] nothing about electronics  MetalDemonics30  Parts  2  6th May 2004 11:29 AM 
Applied Audio Electronics 101201  rick57  Solid State  5  16th May 2003 06:01 AM 
B.K. Electronics  ogp  Solid State  2  19th November 2001 09:00 PM 
New To Site?  Need Help? 