[sdiy] Practical inductor question

David Ingebretsen dingebre at 3dphysics.net
Sun Nov 24 23:52:06 CET 2013


I will Oren. Just working through an efficient way to match the desired
capacitances and resistances with standard values or combinations.

I'll be sure to post on the list when I have something working. I've got
prototype PCBs and I'm stuffing them. Should have an idea in a couple of
weeks.

David

>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>> bounces at dropmix.xs4all.nl] On Behalf Of Oren Leavitt
>> Sent: Sunday, November 24, 2013 3:19 PM
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] Practical inductor question
>> 
>> On 11/24/2013 4:50 AM, David Ingebretsen wrote:
>> > I'm building a Moog 914 filter clone in a euro format, using inductors
>> > hand made by Carsten Tonesmann (thanks Carsten). The inductor wire is
>> > very fine and although I am bolting the inductors down with nylon
>> > hardware, the bobbins are free to rotate inside until the wire stops
>> > it. I'm not gigging this stuff, but I'd like to make sure the bobbin's
>> > to shake and eventually fatigue the wire and break it.
>> >
>> > I thought I could just put a dob of silicone sealant in the gap where
>> > the wire exits the core (like these ones:
>> >
>> > http://www.fair-
>> rite.com/cgibin/catalog.pgm?THEONEPART=5698181221&SEAR
>> > CHAGAI
>> > N=Y#select:onepart).
>> >
>> > Silicone doesn't have any weird properties that will mess with the
>> > inductance does it? I can't see how it could, but I thought I'd ask
>> > before I do something that will be very hard to undo.
>> >
>> > Thanks
>> >
>> > David
>> >
>> 
>> Sounds awesome, David!
>> Keeps us posted on how it goes.
>> 
>> I built this beast a couple of years ago using my own DIY toroidal
inductors.
>> http://flic.kr/s/aHsjMZoqAm
>> 
>> Here's a link showing how I make the inductors:
>> http://flic.kr/s/aHsjz8izaD
>> 
>> The toroid cores used have an AL value of about 6040 and 40 AWG magnet
>> wire was used.
>> If I recall correctly, the 5Hy coils for the low pass end of the filter
bank required
>> about 900 turns.
>> 
>> - Oren
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