Non inductive caps and resistors

Super · 11th October 2001, 03:07 AM

Anyone know of any good sources for non inductive capacitors and resistors? I'm looking for .47uf caps and 8 to 10 ohms for the resistors. I will need them if I have to add a zobel network across the speaker load to keep my amp from oscillating, due to high capacitance cables. (Sigh, one of those downsides to 9ga braided cables

) If the price is right, I'll pick up a bunch for experimenting with. Thanks

GRollins · 11th October 2001, 06:06 AM

Bryan,
You can pretty much take it for granted that metal film resistors are non-inductive. Wire-wound will say if they're non-inductive. Carbon resistors are pretty much non-inductive by definition.
Caps...just buy good ones, and you'll be okay.
When in doubt, scrounge around until you find the specs. Yes, passive components have spec sheets, just like active ones.

Grey

walker · 11th November 2001, 01:31 PM

Most metal film resistors have some inductance although the reactance is very low at audio frequencies. Having said that, I use MEGGITT CGS resistors in high frequency systems, they have very low inductance units.
As far as capacitors, I believe that it is hard to beat polypropylene, these babies are almost the perfect cap on audio and you get to keep all your arms and legs.
Regards WALKER

Petter · 11th November 2001, 04:42 PM

Use a magnet to see if components are ferromagnetic. If they are, you should not use them.

Petter

GRollins · 11th November 2001, 11:16 PM

A surprising number of parts have steel leads...Petter's right, the magnet will tell the tale.

Grey

Petter · 12th November 2001, 12:06 AM

I will be picking up a Neodym magnet (extremely strong) to use for such testing to ensure I won't miss "slightly ferromagnetic parts". Suggest you do the same.

11th October 2001, 03:07 AM	#1
Super diyAudio Member Join Date: May 2001 Location: Connecticut	Anyone know of any good sources for non inductive capacitors and resistors? I'm looking for .47uf caps and 8 to 10 ohms for the resistors. I will need them if I have to add a zobel network across the speaker load to keep my amp from oscillating, due to high capacitance cables. (Sigh, one of those downsides to 9ga braided cables ) If the price is right, I'll pick up a bunch for experimenting with. Thanks __________________ Bryan

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Non-inductive resistors	cathode_ray	Multi-Way	5	27th August 2008 11:20 PM
Non Inductive Resistors in Australia	Numbat	Swap Meet	1	11th March 2007 01:01 PM
WTB: caps, Non-Inductive Resistors, Inductors	gengis	Swap Meet	1	10th March 2006 06:44 PM
Inductive resistors for source resistors	bbakota2000	Pass Labs	12	25th March 2005 12:33 PM
Non-Inductive Resistors	rborer	Solid State	9	3rd September 2001 10:47 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

11th October 2001, 06:06 AM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Bryan, You can pretty much take it for granted that metal film resistors are non-inductive. Wire-wound will say if they're non-inductive. Carbon resistors are pretty much non-inductive by definition. Caps...just buy good ones, and you'll be okay. When in doubt, scrounge around until you find the specs. Yes, passive components have spec sheets, just like active ones. Grey

11th November 2001, 01:31 PM	#3
walker diyAudio Member Join Date: Nov 2001 Location: Perth West Australia	Most metal film resistors have some inductance although the reactance is very low at audio frequencies. Having said that, I use MEGGITT CGS resistors in high frequency systems, they have very low inductance units. As far as capacitors, I believe that it is hard to beat polypropylene, these babies are almost the perfect cap on audio and you get to keep all your arms and legs. Regards WALKER

11th November 2001, 04:42 PM	#4
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	Use a magnet to see if components are ferromagnetic. If they are, you should not use them. Petter

11th November 2001, 11:16 PM	#5
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	A surprising number of parts have steel leads...Petter's right, the magnet will tell the tale. Grey

12th November 2001, 12:06 AM	#6
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	I will be picking up a Neodym magnet (extremely strong) to use for such testing to ensure I won't miss "slightly ferromagnetic parts". Suggest you do the same.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)