Using a ignition coil for a audio transformer

[Sal Brisindi]

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

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

Regards,
Sal

[martin clark]

Would probably go well with that turntable with a bearing based on a Harley inlet valve...

[ray_moth]

There has been a thread abour this

[Eli Duttman]

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.

[AKN]

Hi,

Caution, the speaker leads will carry anode voltage in this circuit.

[Jeb-D.]

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.

[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.

[poynton]

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

[Jim McShane]

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.

[ThSpeakerDude88]

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.