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  1. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 18 here's p7 p8 and p9
  2. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 17 here are the 1'st 6 pages of item 6 in the list of documents posted on april 27. the 16p. document covers the two types of 'high voltage pulsers' science kits for hobbyists that dr alfrey was then marketing. this first type is a present day version of a Kettering style ignition...
  3. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 13 on the april 27 post was a list of 6 documents that go with the 2012 CDI design. here is no. 3 . , the one titled 'capacative discharge pulser fun' . dr tony alfrey added it to his site after the #108 2014 kit went on the market. what you see here are scans of the original 3. p...
  4. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 11 in order to more fully understand the CDI circuit we have to know what the signals on both sides of T1 are. the operation of the DA-2033 Coilcraft transformer and the C2 cap is taking us all to the land of high voltages. in the range 200 to 500+ V , both DC and AC. and is calling...
  5. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 6 ... continuing ... this last image shows us how the Q output follows the AST pulse leading edge. with some delay. measured on my scope to be about 150ns. at the bottom of p. 2 of the TI data , fig. 2 is a circuit sketch of the 4047 innards . and on it i count about 9 logic gates/symbols...
  6. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 6 ... continuing ... here the mech'l switch is replaced with a pulse generator. now we can better control the on-time of the AST pulse signal. plus we are not dealing with switch bounce anymore. this is how we create an exact known quantity of Q output pulses. note - if you dont have a...
  7. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 6 ............ continuing ... now a circuit sketch. this one uses a mechanical switch to create the AST gating pulse . how did we get such a 'clean' AST signal using a switch ? they are known to bounce for 1 to 10 ms . ??? oops, the AST signal was not scoped. so however it looked...
  8. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    may 6 continuing with discovery via experimenting w/ the U4 4047 chip that is on the 2012 CDI PCB the exp's are taking place on a bread board for now. goal today = show what it means for the 4047 to operate in 'gatable' mode. .............. plus 2 circuit examples that were wired up on a bd.bd...
  9. bob weir

    to hire someone who knows s/w turn ckt-diag into PCB Gerber fabrication files

    steve , ak , hevans - thank you all for your response. collectively your ideas have pushed me in the direction of learning the s/w myself and to then use my money to buy chinese-made boards for now. and learning the pcbway.com s/w is the first step. i like how its 1-stop-shopping. and...
  10. bob weir

    to hire someone who knows s/w turn ckt-diag into PCB Gerber fabrication files

    besides Gerber the .pcbway.com fab' house in Hong Kong accepts .pcb , .pcbdoc and .cam files. what i have is the ckt-diag , the parts list and an actual full-size PCB that can be scanned or photo'd. its about 90mm x 100mm. its 2-layer, FR-1 , 1 oz copper what i'm after is to hire someone...
  11. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 29 lately i been taking a closer look at the 2012 CDI circuit : the primary side of T1 . in order to address areas of this circuit operation about which i have little understanding. starting today with U4 , a CD4047 multivibrator IC set up in astable mode. it outputs a square wave of...
  12. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 27 this is a follow up to the april 20 posted idea of making a list of doc's for the '12 cdi design 2012 CDI design documents april 27 2017 ................ date posted 1. 1p. circuit diagram ............. ...
  13. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 24 the last 6 pg of the CDI assembly mnl
  14. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 22 more of the 23p assembly manual plus a re-do of p.3 ... in color this time
  15. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 20 it occurs to me that a list of all of the documents for dr alfrey's CDI design would be useful. then you will know when you have gotten all there is. this is something i will work on and post here. it shouldn't take me too long
  16. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 20 Capacitive Discharge High Voltage Pulser Kit - Assembly Instructions next is the 23p. assembly instruction manual for the 2012 CDI kit design. 5 of those pages are being posted today. its important for all of the material dr alfrey made for this circuit to be in the hands of you who...
  17. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 13 here are the last 3 of 11 pages of the flyback tutorial. some key ideas contained include ... on p.9 how the first coil can sense the 2'd coils magnetic field. ( our CDI design does not take advantage of this, instead using external discrete parts to directly sense the voltage on C2...
  18. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 12 posted here today are 8 of 11 pages dr tony a. wrote up as a supplement to his CDI ignition kit. he wrote & sketched out some background on how the flyback converter part of it works. reading them is a little like having a college textbook in your hands. one thing that stuck with me...
  19. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    april 10 so far here you've seen 2 ways to circuit up a dc:dc switcher hi voltage for the spark. one using the 3845 IC and a 2'd way designed by the late dr tony alfrey , the 2012 CDI circuit featured here . and on searching the literature many more SMPS circuits can be found. there is...
  20. bob weir

    Digital programmable CDI ignition for 2-stroke engines

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