[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] Frequencies
Rhys,
That is a very old and very well tested ciruit that works fine. The diode
won't hurt but is not necessary at all. I have used this circuit and
modifications of it quite a bit. I would like to pass on to you that the
3055 transistors are way over rated and will not stand this for very long
before they "blow" and let all of their smoke out. They claim to be rated at
15 amps but I have yet to see one take much more than 5 amps for long, even
with a massive heat sink. By the way, be sure to use a large heat sink for
the 3055 transistor to have it last more than a few seconds.Also, the
circuit works much better with a separate power supply across the ignition
coil from the one powering the 555 IC. This way, you are able to use much
higher voltages across the ignition coil without the 15 volt limitation of
the 555.
You will be much better served by a simple modification and use a MosFet
instead of the 3055. There are many MosFet's available with much higher
voltage and amp ratings than the 3055 and they are just as inexpensive.
From what you have shown so far, I don't understand why you feel you need
such a large gap for the 25kV and why you would need 50kV to initiate the
spark across the gap. Look at Marx Generators and how they initiate the
primary spark that starts the chain discharge. Many Marx designs use similar
voltages and do not use anything like the gaps you refer to.
Paul
Think Positive
----- Original Message -----
From: Rhys Sage
To: tesla@xxxxxxxxxx
Sent: Sunday, October 11, 2009 22:44
Subject: [TCML] Frequencies
Ok. Here's where I am so far...
http://farm3.static.flickr.com/2643/4002838259_0717959090_b.jpg
http://farm3.static.flickr.com/2628/4003601480_f7df68c001_b.jpg
I don't think I can attach pictures to my postings so I hosted them on
flickr.
All bar the red wires are soldered into place. It just got too late and
after a glass of Kahlua I don't fancy my chances of accuracy. The red wires
go to the + side, the black to the - and the green connect components.
Originally this was going to run the power transistor, hence the 100 ohm
resistor. I plan to use the output from that resistor now (in conjunction
with further resistors) to drive a visible and an infra-red LED. This pulse
controller will be entirely self-contained and separate from the rest of my
electronics. It makes for easier fault-finding later.
The 25kv output from the ignition coil will charge a 5000pf capacitor. By my
calculations, a gap of 3 inches should ensure no spark will flow unless the
air is ionised.
A second ignition coil will produce a 50KV pulse which will ionise the air
and allow current to flow out of the capacitor. Total discharge time for the
capacitor should be around 1/2,000,000th of a second.
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla