SM expose'

[innovation_station]

so i went and found some more parts....

i bought 22 npn 2n3055  transistors and 12 of his brothers

pnp 2n5871

just guess what i will do in my next expairments ....

remember how sm blew that huge fuse in the sm17 demo.......

well

ist

[orbs]

npn 2n3055  transistors

Keep in mind that there have been counterfeit or incorrectly labeled 2N3055 in the past. So you might measure their characteristics first. And if you blow one up, check if its die size was correct. 

[wattsup]

@IS

For the @allcanadian circuit that I am using, I am putting a copy of his circuit here.

Where you see the switch, I am using an IRF9540 which was working OK, but I have to get some more because all are now blown. So I will get some today.

But her is the crazy part.

I was running this using a 12volt 7amp battery. The voltage was at 12.8 off the battery when I started. The average voltage on the output of the secondary was around 90 volts steady. The heat on the heat sink of the 9540 was very very hot, way too hot. The coil of high inductance which is basically a standard toroidal transformer secondary and I could here it ticking then humming then whizzing as frequencies were increased, just like a transducer would do. So all this energy was expended and the voltage on my battery is now 17.5 volts. I never saw it go up to that level before.

I am going to add a diode to send the flyback directly back into the battery without passing through the 9540. This will hopefully help the 9540 to run cooler.

Oh yeh, I tried using an IRF840 on the negative, and kept the center switch always closed, to see if there was anything, and there is nothing. If you do not pulse the circuit where the switch is located, nothing happens and that is normal because this circuit creates a forward flow and a reverse flow that can only happen at the switch point. That's probably why I am blowing so many 9540s.

The ideal is to work on a dc motor/switcher. I will have to solve this once and for all. Damn switching is always the hassle. I am sure if someone came up with a good dc motor mechanical commutator type switcher, they could sell them to many OU researchers. I'd take 4. lol

[innovation_station]

guys i said i have NO HEAT ANYWHERE........


IT HAS RAN FOR DAYS THIS WAY...... BTW I HAVE BLOWEN 0 SWITCHING DEVICES

YOU NEED TO PORTECT IT ......   i use a neon 


ist

so when you disconnect the output it does not back feed to the switch... and blow it up

[Grumpy]

The capacitor should be on the left side of the switch - not the right side.