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[lost66]

From your description it seems like trigger coil has low impedance and it will draw more current than your pot can handle. From the tag on your fan looks like was wired to draw 5W - if I can read it well. Your option would be hd pot (couple watts) at leat until you tune it. After you can measure your pot and replace with resistor. Again, your resistor has to be 5W wirewound, not small 1/2 or 1/4W carbon. Those will go up in smoke, just like your pots. Another option would be to rewind trigger coil with more turns of thinner wire. This will reduce your input current and still be sufficient to trigger your transistor.


Vtech

just had a look on the tag, it i more in the line of 14w or 16w
i do like the idea of wind a trigger coil with thinner wire. then i can use the original to increase the COP.

[blackchisel97]

From your description it seems like trigger coil has low impedance and it will draw more current than your pot can handle. From the tag on your fan looks like was wired to draw 5W - if I can read it well. Your option would be hd pot (couple watts) at leat until you tune it. After you can measure your pot and replace with resistor. Again, your resistor has to be 5W wirewound, not small 1/2 or 1/4W carbon. Those will go up in smoke, just like your pots. Another option would be to rewind trigger coil with more turns of thinner wire. This will reduce your input current and still be sufficient to trigger your transistor.


Vtech

[lost66]

i dont have a COP2 yet, but working on it
i still think i should wind another trigger and use this winding in some other configuration

-it seams such a wast 2 have a whole winding of that size, just 2 trigger (if i could tap off the extra power from it, it might b ok?)

-i am thinking of joining the 2 windings on both sides and run them in parallel a1+b1 start and a2+b2 end?

-or a1 start, join a2 & b1 and have b2 as the end (then it will be in series, and go around the rotor twice)?

-or join both windings in series on each pole to make 1 winding per pole (a bit more work, but can be done)?

-or double up on the circuit, using the 2 windings with 2 circuits in parallel?

after i have done one of the above, then i must add a thinner trigger winding?
or glue a small pc fan on top and use that for triggering?

i really like the light bulb in the circuit thanx, the only 1 i could find was a 3watt so i used it. i will go get a smaller 1 if it will b better. BUT i fried another pot!
the winding must b 2 strong 2 b a trigger! and should be better used as a drive/charge winding

please have a look @ the option above and help me decide on the next steps 2 take

[lost66]

just want to highlight the last couple of points/questions

i dont have a COP2 yet, but working on it
i still think i should wind another trigger and use this winding in some other configuration

-it seams such a wast 2 have a whole winding of that size, just 2 trigger (if i could tap off the extra power from it, it might b ok?)

-i am thinking of joining the 2 windings on both sides and run them in parallel a1+b1 start and a2+b2 end?

-or a1 start, join a2 & b1 and have b2 as the end (then it will be in series, and go around the rotor twice)?

-or join both windings in series on each pole to make 1 winding per pole (a bit more work, but can be done)?

-or double up on the circuit, using the 2 windings with 2 circuits in parallel?

after i have done one of the above, then i must add a thinner trigger winding?
or glue a small pc fan on top and use that for triggering?

[blackchisel97]

Just use the coil terminals, forget about the function of relay. All you need is an extra inductance in series with pot. Small bulb may work better since you'll see getting brighter or dimmer. At the same time you'll notice fan speed changing. Highest base current and brightest bulb doesn't mean better charging. It only means more current.


Vtech

[blackchisel97]

relays, i have plenty will i use it as is, or can i take out the coil (mmm maybe i can use the contacts to do something if and when they pull in? wander what) should i use a bigger or smaller relay? (i dont care wt people say, size does count. ) or will the 'grain of wheat bulb' be better?
that said, i still wnt 2 explore using this winding 4 a better 'COP' have a look further up and let me know wt u think of the options or if u have better ones
thanx 4 the reply, i will do it in the meantime

Try both, maybe grain bulb first. You may have to experiment with different relays since they have a different impedance coils. If relay impedance will be too high circuit wont work. Don't get discouraged, you'll see and learn alot through experimenting. Never disconnect your charging battery while powering circuit. HV has to go somewhere and will arc your pot, and eventually kill transistor. You can replace charging battery with 1 Ohm resistor and measure voltage across. It should be under 1V - 0.3 -0.5 is fine. Over 1V means that you're pushing too much current instead of radiant spikes.


Vtech

[lost66]

Brake bulb is overkill but small 12V 25 - 60mA grain of wheat bulb between the coil and pot (in series) will do. Cold filament of the bulb has very low resistance but when enough current will flow through and lit the bulb, resistance will increase, thus reduce the current going through the pot and into the base of 3055. You can also try to put relay coil (12V) in the same spot - in series with pot.


Vtech

relays, i have plenty will i use it as is, or can i take out the coil (mmm maybe i can use the contacts to do something if and when they pull in? wander what) should i use a bigger or smaller relay? (i dont care wt people say, size does count. ) or will the 'grain of wheat bulb' be better?
that said, i still wnt 2 explore using this winding 4 a better 'COP' have a look further up and let me know wt u think of the options or if u have better ones
thanx 4 the reply, i will do it in the meantime

[blackchisel97]

Brake bulb is overkill but small 12V 25 - 60mA grain of wheat bulb between the coil and pot (in series) will do. Cold filament of the bulb has very low resistance but when enough current will flow through and lit the bulb, resistance will increase, thus reduce the current going through the pot and into the base of 3055. You can also try to put relay coil (12V) in the same spot - in series with pot.


Vtech

[lost66]

i have posted so many times after each other on this page, i hope i am not confusing the subject! Lol. all the questions still stand! (i have not realy made progress) :-( i have now run out of pots so i thought i will put in a 12v brake light bulb, and there is enough power where the pot is supposed to be, to light it up. but sadly there is no real power charging the battery (maybe i should have had the bulb in paralal with the pot or something. i might still have had a pot to play with) i still think i should winde another trigger and use this winding i some other configuratinon (what if, i double up on the circuit, usind 2 windings with 2 curcuits in paralal and 1 or 2 new trigger windings to drive it?

[lost66]

hi joit, i have some luck now the fan is spinning up now. it is running of a 12v battery and @ full speed, there was a volt drop (the battery was not fully charged and has a small charger on it) i then turned the pot a bit, the fan slowed down and the voltage started to go up from the charger. the voltage on the charge side also went up a bit (6volt battery) i dont want to tempt fate and try tune the pot a bit more (it got damaged when i disconnected the charging battery) dont know why? thanx for your help so far

Another thing for the Pot, what i have seen, its the current, what is inducted at the Trigger Coil.
When i make it smaller, with thin wires and lesser winding, it still gets enough current,
to trigger the Transistor, but it dont burn the Pot so easy.
There is a certain Point at the Pot, where it seems its a critical Point.

But i dont know exactly, if the Magnetfield, what is build at the Triggercoil interacts with the Rest or its just for triggering...

thanx joit, i will paste it on the thread. some one might give a answer on it (i must say, i think the trigger winding is definitely over kill and a waist of possible COP energy . it would be better if i can use it for energy, and have a more suited trigger source) pop in on the thread now and the to see if some one has a answer for us

[lost66]

think about where the energy is going if you take off the charging battery, into the pot and burning it out trying the neon bulb across E and The C should help.

well done on getting it going

thanx 4 that
i do have a neon on the transistor, but i dont c that it is helping 2 protect the pot? it is across the run/charge winding? and not on the trigger winding? i might b looking @ it wrong!

[Bodkins]

nother quick update. the fan is spinning up faster now but there is one thing that i c now. if i take the power off the charging battery, then it buggers up the pot. y would this b?

think about where the energy is going if you take off the charging battery, into the pot and burning it out trying the neon bulb across E and The C should help.

well done on getting it going

[lost66]

Light @ The End Of The Tunnel!

good morning all. i dont have a COP2 yet, but working on it looks like i will b frying more "pots" than any thing else (the pot that i am using now is even smaller, but almost transparent. even with load, i can c sparks in it when i try 2 adjust. and then it is buggered. will have 2 get a bigger 2k pot)

it seams such a wast 2 have a whole winding of that size, just 2 trigger (if i could tap off the extra power from it, it might b ok?)
i am thinking of joining the 2 windings on both sides and run them in parallel a1+b1 start and a2+b2 end?
or a1 start, join a2 & b1 and have b2 as the end (in series, around twice)?
or join both windings in series on each pole to make 1 winding per pole?
after i have done that then i must add a thinner trigger winding?
or glue a small pc fan on top and use that for triggering?

so many questions, hope i can get as many answers

[Joit]

Congrats.
Never run it without a load then :P
Adjusting the Pot all time is importend, as i did write you earlier too.
But you maybe need first a bit more feeling for it.

[lost66]

one last update befor i go sleep. i have some luck now the fan is spinning up. it is running of a 12v battery and @ full speed, there was a volt drop (the battery was not fully charged and has a small charger on it) i then turned the pot a bit, the fan slowed down and the voltage started to go up from the charger. the voltage on the charge side from the fan also went up a bit (6volt battery) i dont want to tempt fate and try tune the pot a bit more (it got damaged when i disconnected the charging battery) dont know why? ...sleeeeep!!!!