Recent content by bob weir

  1. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 24 here the 2 boards are joined as they will be for the immediate future. already one problem is seen. in the fit. C5 sticks up high and the signals board will need its corner trimmed. or possibly just add more standoff pieces so the 2 PCBs are further apart. more problems may turn up...
  2. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 24 an error was the mounting holes being too small for the standoffs that will join the 2 PCBs so with a metric mike the thread diameter was found , about 2.74 mm . then a 3mm drill used to enlarge the holes
  3. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 24 this 'signals' board works with the main CDI ignition board. it accepts the flywheel timing signals, crunches them and with the 508 uC delivers a signal to the CDI board that causes it to make the plug spark here in the foto they both are side by side. the CDI board is the 2012...
  4. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 24 fresh news of the 2'd PCB order with EasyEDA. new to arrive are 10 boards of the 'signals' type. they look good. they were last mentioned on p. 12 june 5 ATTACH=full]35360[/ATTACH]
  5. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 16 a mistake on the july 14 post was to call P9 and P10 ( P11 too ) a "... female header" ... if you go onto ebay and look for them there the keywords are : " 2 pin 2 way 2.54mm 0.1" pitch screw terminal block connector " expect to pay 20 cents each depending on quantity.
  6. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 16 good news to report. when the july 14 PCB was fully populated and powered it ran as expected. the 508 uC code was some old test code . it counts 0,1,2,3,... 255. and sends the byte out the DI and CLK pins seriallly. this code was tried out with the 508-2 uC chip you see in the foto...
  7. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    july 14 the first EasyEDA PCB order came. late june. and none of the boards had traces of copper on them to connect the parts. so i wrote to Nicole and she asked for the Gerber files to be re-submitted. that was done. and hardly a week later a new set of 10 boards arrived that had the expected...
  8. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    june 27 this post is a follow up to the 'may 12' / june 12 post. and over the next several posts how the testing was done will be shown. that is , how the signals board circuit with its pulse generator input signal & opto-isolator was connected to the CDI ckt bd. and a spark plug...
  9. bob weir

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

    to my may 4 post readers - the services of someone to convert a schematic into a PCB are no longer needed. so that initial request for paid help that led to the post on may 4 is cancelled what i wrote on may 5 still holds. and am still very much engaged with learning some s/w. its that of the...
  10. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    oops, the above post date of 'May 12' was posted today , june 12 bw ps - the 10 boards for $2. was not a mis-print
  11. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    May 12 this is a follow up to the june 5 post. the first of its kind on making PCB's for the two main circuits we are dealing with in this ignition project. to clarify for those of you new to this post : .. the two main circuits/PCBs for this ignition project are : .... a. the 2012 CDI...
  12. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    june 7 last month while playing around with the CDI circuit i tried probing Q2's drain while it was charging up C2. and got a rather clean image. its what you see below. i believe now that something was done to the secondary side to disable the spark from firing. removing the U1 chip would...
  13. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    june 7 along with using the correct probe to measure Q2 and Q1 we also have to tell the scope what the V-ratio is . when we do this the scope automatically scales the on-screen V-readings like V-max and Vpp to read like it were a voltmeter. having the scope do the math saves us that step...
  14. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    june 7 this above image is off the Q1 and Q2 data sheets. each of those n-FETs has a spec for the max voltage between its drain and source.. exceed that and it could well have become damaged. going into this study i hadnt yet caught on to what the data was telling me. my focus was on...
  15. bob weir

    Digital programmable CDI ignition for 2-stroke engines

    June 7 returning to the 2'd June 2 post. and the matter of using the scope to probe hi-voltages. lets first state why this has come up. the 2012 CDI circuit takes 12V and via some switching action with Q2 and T1 boosts it to 300-400V on C2. for the sake of knowing the switching circuit...
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