Choke input with a field coil.

lochness · 26th June 2008, 06:15 PM

I'm guessing this is a no as I have not seen it done in any of the old schematics I have but can you do a choke input power supply with the field coil. I'm guessing no as it would be too much noise near the voice coil. Would the humbucking coil attached to the voice coil be able to handle it?

lochness · 1st July 2008, 12:18 AM

So I take it no one knows?

lochness · 4th July 2008, 01:24 AM

Well after running a few simulations in PSUD2 it seems choke input isn't a good idea if the field coil is the first choke. If it is the second choke than its not too bad.
Question if I do an LCLC filter does the first choke have to be the same value as the field coil (inductance and impedance) and should the first choke be a swinging choke?
How do I measure the inductance of the field coil?

Tweeker · 4th July 2008, 01:50 PM

Field coils have been used in the psu, back when, for entirely economic reasons.

It does not have to be the same value.

Whether or not the first choke should be a swinger depends on the load (and availability). If your in class A no, it can be of benefit as you go into class B.

Measuring inductance is tricky as it drops with increasing DC current as the core saturates.

26th June 2008, 06:15 PM	#1
lochness diyAudio Member Join Date: Dec 2006	Choke input with a field coil. I'm guessing this is a no as I have not seen it done in any of the old schematics I have but can you do a choke input power supply with the field coil. I'm guessing no as it would be too much noise near the voice coil. Would the humbucking coil attached to the voice coil be able to handle it?

4th July 2008, 01:50 PM	#4
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Field coils have been used in the psu, back when, for entirely economic reasons. It does not have to be the same value. Whether or not the first choke should be a swinger depends on the load (and availability). If your in class A no, it can be of benefit as you go into class B. Measuring inductance is tricky as it drops with increasing DC current as the core saturates. __________________ Be sure your foil hat has a good low impedance ground.

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1st July 2008, 12:18 AM	#2
lochness diyAudio Member Join Date: Dec 2006	So I take it no one knows?

4th July 2008, 01:24 AM	#3
lochness diyAudio Member Join Date: Dec 2006	Well after running a few simulations in PSUD2 it seems choke input isn't a good idea if the field coil is the first choke. If it is the second choke than its not too bad. Question if I do an LCLC filter does the first choke have to be the same value as the field coil (inductance and impedance) and should the first choke be a swinging choke? How do I measure the inductance of the field coil?

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