free impedance converter - diyAudio
Go Back   Home > Forums > General Interest > Everything Else
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 4th May 2007, 05:45 AM   #1
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
Default free impedance converter

I'm no great programmer- couldn't even play one on TV. Regardless, here's a Windows version of a utility I've found handy for converting bridge results and vector impedance meter readings to a more useful form. It can also give more insights into the real meaning of Q, DF, and phase angle for common components. There's nothing here that any spreadsheet can't do, but I find a small dedicated utility a bit handier at times. Have a look and let me know if you see any horrific bugs, misspellings, or think of some feature I should add. There's room for lots more buttons :-)

Z-verter Impedance Converter

  Reply With Quote
Old 6th May 2007, 03:21 PM   #2
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
Put up a new version with some bug fixes. Ditch the old one and grab the new one. (old version had atto and femto prefixes reversed) Added some more conversions, including current and voltage to value, so you can measure components with just a signal and AC voltmeter. If not doing it with a scope, just enter minus 90 degrees for capacitors, plus 90 for inductors. Same request- let me know if you find bugs or can think of anything useful to add. Or if it's just useless.
  Reply With Quote
Old 8th May 2007, 05:17 AM   #3
gpapag is offline gpapag  Greece
diyAudio Moderator
gpapag's Avatar
Join Date: Nov 2002
Location: Athens-Greece
Hi Conrad

Thank you for sharing it.
Would it be difficult to include a short explanation of the Symbols?

  Reply With Quote
Old 8th May 2007, 11:30 PM   #4
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
The symbols are pretty standard. The idea of the program is to convert any of the several ways of expressing impedance, into a standardized list containing all the forms.

The forms include component values like capacitance and dissipation, Z, the impedance consisting of resistance (R) and reactance (jX), Y, the admittance (reciprocal of impedance), consisting of conductance (G) and susceptance (jB), and vectors consisting of Z and phase angle. If you have any of the above types, you can calculate the other ones. They all give you the same information, but sometimes a certain form is more convenient.

Within the above forms you might use either a series or parallel loss model. Cs is capacitance using the series model for capacitance, where you have a series resistor accounting for the losses. Note that most capacitors have a somewhat constant dissipation factor with frequency, meaning that the series resistor is *not* constant with frequency. That's why you have to be careful using a fixed resistor in simulations. Cp is capacitance using the parallel model, where losses are accounted for with a resistor across the capacitor. That doesn't mean a real capacitor has that much DC leakage, but the model is only used for AC calculations. Ls and Lp are inductance, again using the series and parallel models. Note that G and B are invariably parallel quantities.

You'll also find a calculation for two Cs or Ls values. The old "add the values for parallel" technique doesn't take losses into account, so if you know the dissipation factor, you can get a more accurate result. Finally, there's a selection to enter voltage and current, as all the above can be calculated from that as well.

As a practical matter, I use the program to convert Z and Y results from one of my bridges, to practical component values. I also like to see what R is at a given frequency for capacitors and inductors. Note that I didn't include a button for Ls and R, as one would have a tendency to enter DC resistance of a coil. That's not very accurate much of the time, so one shouldn't be tempted. OTOH, if enough people want it...

I'm not sure where there's a good impedance tutorial, but there's probably something on the 'net. The intro for old GR bridges is usually good, and there might be some useful references on the Quadtech or IET websites.

I hope I got the above right...

  Reply With Quote
Old 17th May 2007, 11:05 PM   #5
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
Added a couple more choices that might be useful when looking at amplifier output networks- parallel model for inductors. Get your free upgrade here! (just click on the original link) Judging by the lack of comments I'll assume no one has found any glaring errors?
  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
FREE FREE - Panasonic A310 DVD Player - FREE FREE Kane Williams Swap Meet 6 27th September 2008 02:35 PM
Switched Capacitor Impedance Converter smoking-amp Tubes / Valves 5 31st January 2008 07:51 PM
Measuring free air impedance with baffle? davidallancole Multi-Way 9 8th January 2008 08:01 PM
electret impedance converter jamesbull Everything Else 1 11th January 2007 10:12 PM
J-fet impedance converter from AT Condensor michael_krell Parts 1 9th February 2005 05:59 PM

New To Site? Need Help?

All times are GMT. The time now is 11:20 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