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Old 21st July 2007, 10:20 PM   #1
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Default Using a ignition coil for a audio transformer

Hmmm,
I wonder how this would sound....

http://www.allaboutcircuits.com/vol_6/chpt_5/19.html

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Sal
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Old 21st July 2007, 10:59 PM   #2
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Would probably go well with that turntable with a bearing based on a Harley inlet valve...
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Old 22nd July 2007, 12:03 AM   #3
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There has been a thread abour this
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Old 22nd July 2007, 12:39 AM   #4
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Quote:
Originally posted by martin clark
Would probably go well with that turntable with a bearing based on a Harley inlet valve...

Naughty boy!

Altmann DIY TT here. The man built what appears to be a satisfactory mass damped basing system. For somebody with the necessary power wood and metal working equipment, that just might be a good project. Drill 12 pockets around the periphery of the platter and fill them with Lead. An acrylic sheet as the top layer of the platter and a good clamp should finish things off nicely.
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Old 22nd July 2007, 12:54 AM   #5
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Hi,

Caution, the speaker leads will carry anode voltage in this circuit.
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Old 22nd July 2007, 02:34 AM   #6
Jeb-D. is offline Jeb-D.  United States
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Ignition coils are flyback transformers which work as a coupled inductor. I'm not sure if that is an ideal characteristic for output transformers. Sure it may work, but better than transformers designed for audio?... probably not.
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Old 22nd July 2007, 03:29 PM   #7
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You can buy an inexpensive OPT for less than you would normally spend for a new ignition coil (junkyard parts are cheaper obviously).

So the rationale for using the ignition coil has pretty much gone away, and the high voltage on the speaker leads hazard would deter me from recommending it.
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Old 22nd July 2007, 04:09 PM   #8
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Jim McShane
You can buy an inexpensive OPT for less than you would normally spend for a new ignition coil (junkyard parts are cheaper obviously).

So the rationale for using the ignition coil has pretty much gone away, and the high voltage on the speaker leads hazard would deter me from recommending it.

It is easy to re-arrange the connections to the coil !!

Andy
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Old 22nd July 2007, 05:04 PM   #9
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Quote:
Originally posted by poynton

It is easy to re-arrange the connections to the coil !!

Andy
But it is not possible to isolate the "primary" and "secondary" windings like a real OPT does, and if you are going to redesign the circuit you might as well eliminate the coil/autoformer anyway.

You can buy a real OPT for under $20 US, and a coil will as much or more unless you can get one from a junkyard.
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Old 24th July 2007, 03:36 AM   #10
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not necessarily.. a few of my neighbors have boxes full of old ignition coils .. I guess its for people who know people like that to fiddle with. It is ashame that an ignition coil doesn't have another secondary, as it could be used as a parafeed opt with the primay having the choke integrated.
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