Differences in inductors?

leadbelly · 29th June 2003, 05:49 AM

I'm scrounging through recycled parts to find suitable inductors for a PS CRC filter for my tube IGC (see JLTi thread).

Is one of the following types of inductors more suitable for a CRC filter (other than the obvious differences in inductance and compactness)? The one on the left is from a speaker crossover and measures 0R6, and the one on the right is from a switching PS and measures 0R3:

Sch3mat1c · 29th June 2003, 07:43 AM

You mention tubes (though I don't find the thread on that board); I can only assume your power supply will operate on 50 or 60Hz.

The chokes shown are for filtering HF; the speaker crossover for cutting high-F audio, the line filter for >50kHz to remove line noise from switching supplies, which would otherwise put unacceptable junk upstream of the supply.
You need a choke which looks more like a transformer, one with an iron core.

Tim

roddyama · 29th June 2003, 07:53 AM

Leadbelly,

The one on the right is a common-mode-choke. Here are some threads on these.
Using common mode chokes in filament supply.
Could this be the perfect coils for Aleph's PS?

leadbelly · 29th June 2003, 04:50 PM

Thanks.

Well, it sounds like neither of those is very good. Would another inductor from a xover work, one with a laminated steel core?

This is for the tube IGC in Chip Amp forum. Draw is on the order of milliamps, so I just want to recycle something from the tons of parts I have.

29th June 2003, 07:43 AM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	You mention tubes (though I don't find the thread on that board); I can only assume your power supply will operate on 50 or 60Hz. The chokes shown are for filtering HF; the speaker crossover for cutting high-F audio, the line filter for >50kHz to remove line noise from switching supplies, which would otherwise put unacceptable junk upstream of the supply. You need a choke which looks more like a transformer, one with an iron core. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

29th June 2003, 07:53 AM	#3
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	Leadbelly, The one on the right is a common-mode-choke. Here are some threads on these. Using common mode chokes in filament supply. Could this be the perfect coils for Aleph's PS? __________________ Rodd Yamashita

29th June 2003, 04:50 PM	#4
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Thanks. Well, it sounds like neither of those is very good. Would another inductor from a xover work, one with a laminated steel core? This is for the tube IGC in Chip Amp forum. Draw is on the order of milliamps, so I just want to recycle something from the tons of parts I have. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

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