AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

Inductor questions

Started by Govmnt_Lacky, June 06, 2011, 09:44:14 PM

Previous topic - Next topic
Print
Go Down Pages1
User actions

Govmnt_Lacky

June 06, 2011, 09:44:14 PM
I was able to dig up some 500mH inductors but I have a question as to whether or not they can be used for a wah circuit.

They are, as I said, rated at 500mH BUT.... they measure about 235 ohms resistance. I know that the usual whipple, fasel, etc measure far less than this however, could these inductors be used for a wah circuit? If so, what would need to be changed to compensate for the higher resistance

The inductors look like this but wrapped in plastic and they have flying leads:

http://www.hurricaneelectronics.com/images/inductor.jpg

Thanks for the help  ;D
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Govmnt_Lacky

#1
June 07, 2011, 09:49:52 AM
Any ideas?

Bump-digity  ;D
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

merlinb

#2
June 07, 2011, 10:18:07 AM Last Edit: June 07, 2011, 10:20:45 AM by merlinb
235 ohms is negligible compared with everything else in the (typical) circuit, so it won't be a problem (I make the maximum available Q about 26 which is still way beyond what you actually need). You can always increase the 33k damping resistor a little to compensate, but I doubt you'll actually need to.

Govmnt_Lacky

#3
June 07, 2011, 10:52:10 AM
Quote from: merlinb on June 07, 2011, 10:18:07 AM
235 ohms is negligible compared with everything else in the (typical) circuit, so it won't be a problem (I make the maximum available Q about 26 which is still way beyond what you actually need). You can always increase the 33k damping resistor a little to compensate, but I doubt you'll actually need to.

Thanks Merlin!  ;D

Next step is to slap it into a circuit and see how they sound!
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Joe Hart

#4
June 07, 2011, 11:02:09 AM
I have some old radios and TV's and such that have inductors. I wish I could measure their inductance. Is there any other way to tell? Do they have any markings like resistor color bands or the codes stamped on some capacitors?
-Joe Hart

Govmnt_Lacky

#5
June 07, 2011, 11:58:02 AM
Quote from: Joe Hart on June 07, 2011, 11:02:09 AM
I have some old radios and TV's and such that have inductors. I wish I could measure their inductance. Is there any other way to tell? Do they have any markings like resistor color bands or the codes stamped on some capacitors?
-Joe Hart

The inductors that I found have part numbers on them (how convenient) and they are even stamped as 500mH rating. I ran the part number through Google and it crossed to the real deal. So I decided to take some DMM resistance readings and they all measured between 230-242 ohms.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Brymus

#6
June 07, 2011, 12:07:03 PM
The inductor on my Boss wah is a transformer,sounds good.
It measures 52R
I have a bunch of inductors and small transformers pulled from old TVs ect.
I am going to breadboard the Mc Coy circuit and see if any of them sound good.
I also have the small Radio Shack and Mouser trannies that are supposed to work so I will compare the lot.
I'm no EE or even a tech,just a monkey with a soldering iron that can read,and follow instructions. ;D
My now defunct band http://www.facebook.com/TheZedLeppelinExperience

Brymus

#7
June 07, 2011, 12:09:32 PM
Quote from: Govmnt_Lacky on June 06, 2011, 09:44:14 PM
I was able to dig up some 500mH inductors but I have a question as to whether or not they can be used for a wah circuit.

They are, as I said, rated at 500mH BUT.... they measure about 235 ohms resistance. I know that the usual whipple, fasel, etc measure far less than this however, could these inductors be used for a wah circuit? If so, what would need to be changed to compensate for the higher resistance

The inductors look like this but wrapped in plastic and they have flying leads:

http://www.hurricaneelectronics.com/images/inductor.jpg

Thanks for the help  ;D

Is there any way you could measure yours (mm or inches) and count the windings (it doesnt look like many)
those look like several of the salvaged ones I have.
I'm no EE or even a tech,just a monkey with a soldering iron that can read,and follow instructions. ;D
My now defunct band http://www.facebook.com/TheZedLeppelinExperience

bluesman1218

#8
June 07, 2011, 12:19:39 PM
Someday I'm gonna have to learn about inductors. I have been saving them whenever I strip a board. Are they the same as chokes? Like I said, gonna hafta learn 'em.  :icon_redface:
It's all about the tone!
Steve

POPA - Plain Old Power Attenuator AVAILABLE for PURCHASE soon!
Silvertone 1482 rebuilt - switchable Tweed, tube reverb, Baxandall + / Little Angel Chorus build, tons of Modded pedals

Govmnt_Lacky

#9
June 07, 2011, 12:19:56 PM
Quote from: Brymus on June 07, 2011, 12:09:32 PM
Is there any way you could measure yours (mm or inches) and count the windings (it doesnt look like many)
those look like several of the salvaged ones I have.

That picture was only intended for reference  :icon_redface:

The actual inductor that I have has many, many, many more windings!  :icon_eek:

A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'
Print
Go Up Pages1
User actions