Bedini replication in Germany

[zott]

 Last night after  putting switches on the pos drive buss  ,and cutting and moving other things I decided to  give the transistors 24 vdc and  pull all the resistance  and current buffers  and watch the scrawny bd 243c's pop one at a time  kinda like popcorn  I new what  would happen if I did that but I needed some action  after all the wiring and solder smoke.   for  now I'm in the  need for some captain morgan spiced rum ... need rum

[Ren]

lol, dropped a 24v nuke for some little puffs of smoke hey

I know how you feel, it can be frustrating getting a multi coiler to  run smooth.

Your diagram looks good from what I can tell. What did you change from the circuit that was working? Anything besides the busses and on/off switches?

Unfortunately I can only offer some suggestions to check your circuit out.

First things first, get it running off one coil only. One transistor only too if possible. This is where a switch for EACH power winding can come in handy as it will allow you to fire one coil, one winding minimum. 12 awg is pretty thick stuff, you'll probably find that you will need very little resistance on the trigger probably in the 50 ohm to 150 ohm, maybe less. Make sure they are over 1 watt rated preferably 2 watt with wire that size. Once you have one winding firing on one coil start adding other transistors to the other windings testing each one as you go. I would definately be using the 2N3055 for this circuit, even better the mlj21194 although these are about $10 bucks a pop so maybe not just yet.

Make sure the collectors of all transistors are isolated from each other. Remember the metal backing of the transistor is part of the collector too, so you cant mount them all on something conductive. Also each base of each transistor should have the same resistance and your pot/small globe should be your only adjustment on your master coil. Sometimes it helps to just clip everything together first, check to see it works well then solder everything one at a time. Much less dissapointment too.

Keep going mate, the rum will help for now, just get one coil up and running first with the right resistance and go from there.

Good luck!

[zott]

 Well after the  smoke show I decided  to re transistor up to a set of  NTE 331 npn.s   , these are 15 amp   and some tougher  well  I  also remounted everything on a thicker board  and strung a new set of buss lines in a circle around the  outside of the coils ... hmmm 

[zott]

 Ren sorry about the mistype  but  should have  typed the wire size I used in the coils was 19 awg  not 12 , and I have mica backs on the  new transistors I installed (nte 331's)  and the collectors are isolated to each transistor  except the driver battery does connect them with the pos  terminal  through the coils.  and the resistance on the trigger line is 4 100 ohm resistors 2  parralelled with 2 in series ,then through a 1 watt  12volt neon bulb   finally through a 50 ohm wire wound var-resistor.. after all this  I spun "ER" up  and   Gadzooks  it took off like a hyper foibling warble warp   . It used to  just spin at a countable rotation  " how lovely" but useless . now it is spinning at a speed that has me ducking and hiding behind my arms when I go near it to adjust and measure  . It's about time. it only took 6 months

[zott]

 after all the hand filing to cut the magnet slots and  drilling out the center hole then gluing the 2 magnets into the slot using automotive goop  the magnets seem to be holding tight and there is only a couple of harmonic shudders on it's way to hyper speed  then it spins perfectly and quietly I am still using more power to spin the rotor than I can pull uot of the charge circuit , but it does charge