piezos again!

baggins · 23rd February 2006, 10:41 PM

Ive just had a thought It may be totally erroneous but here goes :-

Buy 2 cheapo piezo's @ 2.50 ea. (price of ksn 1038 clones in my local musical instrument store) .Wire one in series with a 100 ohm linear pot
and wire it anti - phase to the first one .adjust pot for smoothest output (measure value and replace with fixed resistor) any mileage in this idea ?

rcavictim · 24th February 2006, 01:10 AM

For a lousy five bucks you aren't willing to do the experiment yourself and truly learn from a hands on experiience that begins with an idea? This is the DIY forum. Are you in the wrong line?

I am not picking on you. I am picking on your method.

I_Forgot · 24th February 2006, 01:58 AM

Quote:

Originally posted by baggins
Ive just had a thought It may be totally erroneous but here goes :-

Buy 2 cheapo piezo's @ 2.50 ea. (price of ksn 1038 clones in my local musical instrument store) .Wire one in series with a 100 ohm linear pot
and wire it anti - phase to the first one .adjust pot for smoothest output (measure value and replace with fixed resistor) any mileage in this idea ?

What are you trying to achieve by doing this?

I_F

baggins · 24th February 2006, 01:58 AM

Hey, No sweat
I probably will try it but at the moment Iam in the middle of building a set of speakers using ksn1165 and i just thought I,d share the Idea
in case anyone had thought of using this Mechanical negative feedback
idea before - at least theres no delay involved as in electronic feedback !

baggins · 24th February 2006, 02:03 AM

I_forgot,

I thought that in theory of applying direct negative feedback to the output at a reduced volume would smooth the peaks and troughs and
give a smoother output .As I said - IS THERE ANY MILEAGE IN IT .

I put the Idea up to see if it stood up theoretically I am sure you bods probably Know why its a non runner!!

sreten · 24th February 2006, 10:06 AM

Quote:

Originally posted by baggins
I_forgot,

I thought that in theory of applying direct negative feedback to the output at a reduced volume would smooth the peaks and troughs and
give a smoother output .As I said - IS THERE ANY MILEAGE IN IT .

I put the Idea up to see if it stood up theoretically I am sure you bods probably Know why its a non runner!!

NO THERE IS NOT !

You are not using negative feedback and the the principle
of linear superposition means the result will be the same
as using one tweeter attenuated.

In practise it will be worse due to inteference between
the two tweeters.

/sreten.

baggins · 24th February 2006, 12:14 PM

Thanks Sreten ,

I had realised overnight that it would not work with program
material - Ive been looking at too many response curves lately!

23rd February 2006, 10:41 PM	#1
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	piezos again! Ive just had a thought It may be totally erroneous but here goes :- Buy 2 cheapo piezo's @ 2.50 ea. (price of ksn 1038 clones in my local musical instrument store) .Wire one in series with a 100 ohm linear pot and wire it anti - phase to the first one .adjust pot for smoothest output (measure value and replace with fixed resistor) any mileage in this idea ? __________________ heretics are sometimes right

24th February 2006, 01:10 AM	#2
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	For a lousy five bucks you aren't willing to do the experiment yourself and truly learn from a hands on experiience that begins with an idea? This is the DIY forum. Are you in the wrong line? I am not picking on you. I am picking on your method. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

24th February 2006, 01:58 AM	#4
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	Hey, No sweat I probably will try it but at the moment Iam in the middle of building a set of speakers using ksn1165 and i just thought I,d share the Idea in case anyone had thought of using this Mechanical negative feedback idea before - at least theres no delay involved as in electronic feedback ! __________________ heretics are sometimes right

24th February 2006, 02:03 AM	#5
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	I_forgot, I thought that in theory of applying direct negative feedback to the output at a reduced volume would smooth the peaks and troughs and give a smoother output .As I said - IS THERE ANY MILEAGE IN IT . I put the Idea up to see if it stood up theoretically I am sure you bods probably Know why its a non runner!! __________________ heretics are sometimes right

24th February 2006, 12:14 PM	#7
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	Thanks Sreten , I had realised overnight that it would not work with program material - Ive been looking at too many response curves lately! __________________ heretics are sometimes right


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