Check out this 26cc weed wacker motor, i asked him the RPM ......17,860 with stock ignition

http://www.youtube.com/watch?v=OdAezAccDns

sounds like a glow motor on Crack haha

Brett.. Updated post #690 with schematic for my CDI.. Hand drawn but I think it's readable.. a basic CDI circuit that works with low current draw from a 4.8 volt nicad pack.

hay there is nothing in the PDF file that i downloaded....maybe its my end

John,

I am impressed with your toroid winding skills. I may have to try one.

Anyone have a problem downloading the pdf files? When I pull the one on the left (PCB) it is small..you have to expand it to 100%...The one on the right is schematic..scroll down for the full view.. all in post #690

John

I understand i just needed to zoom it up......

I got my ignition working enough to do a couple of dyno runs, i had a faulty ignition coil or the very low Ohms caused the motor to miss

this test is with fixed timing, motors starts and runs ok up to alittle over 12,000rpm

there was no difference in the power BUT remember it has fixed timing and had no time to adjust

brett

sorry the yellow is hard to see

yellow and green is CDi test
red and blue stock ignition

Schematic of John

haha Put C2 on the other side of SCR and it will work haha

OEPS I change it.

In the above schematic I think it would work a little better with a series resistor at the base. Say 100 ohm for starters.

I updated my schematic PDF file in post #690 Charlie... The resistor was drawn but not identified...it's a 1.5k ohm. I think Rob missed it because it wasn't labeled..ooops..

Rob, can you make the change for us in your drawing? Thanks..

Sorry for any confusion. It was late and a long day for me.
That value for R-1 can be adjusted to a lower value if needed..I made it 1.5k for that particular Fairchild transistor. If you use another brand, value to get oscillation may need to be changed to a lower value, but's a place to start. Everything else works fine as is.

John

Rob,

I downloaded the latest CDI curve.Thanks.Did you make it.

Rob, thanks for adding my Design to your site...you are doing too much work! So many good designs to choose from now.. I'm going to etch your version of my board.. looks smaller than what I had done.. Great job!!

John

Please check the board befor you start, I can make mistakes.

If you check the first powerboard, yuo can see its allmost the same with your board.

Hi John,
How did you test your spark on your power board ?

what performance did you get from it ( how many sparks per min)

cheers
brett

Sh*t happens today.
My scanner scan with a angle, carbatterie empty, Buss fuse from multimeter broke, scr (bt151) powerboard broke, I hate those days.

Hello fellas,

I was messing around with the curve generator(latest version) and I noticed the zeros are placed through different parts of the table. is this on purpose?


and its like this all through the table. this don't make sense to me.

This table is supposed to load the timer0 for the delays (curve).with zeros in the middle the curve will be all over the place.

Somthing is wrong because that would coarse a miss i would say

my old copy does not do that

did you only paste half the number becuase mine is this long

const char tspark[]={ 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 25, 26, 26, 27, 27, 28, 29, 29, 30, 30, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 38, 39, 39, 40, 40, 41, 41, 43, 44, 44, 45, 46, 46, 47, 47, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 58, 58, 59, 60, 60, 61, 61, 62, 62, 63, 63, 64, 65, 70, 71, 71, 72, 73, 73, 74, 75, 75, 76, 76, 77, 77, 78, 79, 79, 83, 84, 84, 85, 85, 86, 87, 87, 88, 88, 89, 90, 90, 91, 92, 92, 93, 93, 94, 95, 95, 96, 97, 101, 101, 102, 103, 103, 104, 105, 105, 106, 106, 107, 108, 108, 109, 110, 110, 111, 112, 112, 113, 114, 114, 115, 116, 116, 117, 117, 118, 119, 119, 120, 123, 123, 124, 125, 125, 126, 127, 127, 128, 129, 129, 130, 131, 131, 132, 133, 133, 134, 135, 135, 136, 137, 137, 138, 138, 139, 140, 140, 141, 142, 142, 143, 144, 144, 145, 146, 146, 147, 148, 148, 149, 150, 150, 151, 152, 152, 153, 154, 154, 155, 156, 156, 157, 157, 158, 159, 159, 160, 161, 161, 162, 163, 163, 164, 165, 165, 166, 167, 167};

I found this list of circuits for DC-DC converters

http://www.discovercircuits.com/C/co-dctoac.htm

brett

There must be 256 numbers in the table.
The numbers are differend if you don't make the same table.
See wat happens if you make the hole curve 15 degrees or 30 degrees.
The curve into the curvegenerator is the most common.

Rob can you put the starts of the windings for Johns circuit on your site


What would the c code meant to look like if you had all 30 degree ???

can you post them

brett

Rob in the TDi curve the max RPM is protected and you can not change

The code for all 30 degrees lookslike 0,0,1,1,2,2,3,3,4,4,5,5,6,6 aso

The maxrpm into the TCI generator you can change by the pulldown menu.

John's powerboardcoil winds all clockwise or the other side.

you can not change by the pull down cell.....it is protected