Hmmm,
I wonder how this would sound....
http://www.allaboutcircuits.com/vol_6/chpt_5/19.html
Regards,
Sal
I wonder how this would sound....
http://www.allaboutcircuits.com/vol_6/chpt_5/19.html
Regards,
Sal
martin clark said:
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.
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.
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.
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 said:
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.
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.
I feel sure that it's not meant to be considered a project with a useful product, I think it's just an experiment to see what can be done.
I once built that circuit.....as an amplifier to take with me to the beach....
I used a 6V battery(for scooters) which used a solid state 'vibrator' to get the high voltage.
The ignition coil was from an old opel kadett (european car)
It would work for about 3-5 hours on one battery.
Sound level was about the same as those little i-pod/walkman speakers.
sound quality was reasonable, not good....
In my opinion it is just a gimmick....
I used a 6V battery(for scooters) which used a solid state 'vibrator' to get the high voltage.
The ignition coil was from an old opel kadett (european car)
It would work for about 3-5 hours on one battery.
Sound level was about the same as those little i-pod/walkman speakers.
sound quality was reasonable, not good....
In my opinion it is just a gimmick....
SE cathode follower
Hmm... Looks dangerous.
Instead what he did he could have tried SE cathode follower. Then he would have had safe DC level at the output. It would look something like this:
Image source: http://www.tubecad.com/2005/June/blog0048.htm
Since he couldn't do that with a single tube, he chose to do what he could with one tube. That is allright as an experiment, but better not to make a product of it.
Sal Brisindi said:
Hmm... Looks dangerous.
Instead what he did he could have tried SE cathode follower. Then he would have had safe DC level at the output. It would look something like this:
Image source: http://www.tubecad.com/2005/June/blog0048.htm
Since he couldn't do that with a single tube, he chose to do what he could with one tube. That is allright as an experiment, but better not to make a product of it.
- Status
- Not open for further replies.