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  1. WHONOES

    Ignition Coil Driver Questions

    Just remembered that I should have said earlier that you must add a 10μf decoupling capacitor directly across the supply pins on the 40106. Also, connect the inputs of any unused gates to 0V.
  2. WHONOES

    Ignition Coil Driver Questions

    Your build looks good. Nice and neat. If required, you could reduce the pulse width by reducing the value of R3 to 12 or 10K. But if the pulse width is OK as is then I would leave it alone. I don't know if the actual pulse width has any effect on the apparent ignition timing. If the timing is...
  3. WHONOES

    Ignition Coil Driver Questions

    I must mention that in the last schematic I provided, Q1 is labelled as a QMJE350. The Q prefix is an oddity of the simulator that I use. If you intend to buy the transistors indicated, just shop for an MJE350 and MJE340. Incidentally they are rated at 350V and have quite good gain for high...
  4. WHONOES

    measuring output current circuit ?

    Are you trying to measure the amount of current available from a car cigar lighter socket?
  5. WHONOES

    Heathkit Condenser Checker

    Looks like an axial cap' to me.
  6. WHONOES

    Timer 555 voltage

    Indeed it is. I think Mouser are American and have a UK base.
  7. WHONOES

    Timer 555 voltage

    I buy bits form Farnell, RS Components and Mouser. No problems with any of them.
  8. WHONOES

    Ignition Coil Driver Questions

    I'd wait until you get it working first.
  9. WHONOES

    Ignition Coil Driver Questions

    See attached the last part of the pulse generating section. Read the notes.
  10. WHONOES

    Why is this Happening to Me?

    AS I've said before, one of the biggest stumbling blocks when prototyping or even building a developed design is building it in one hit. Most, but not all, circuits can be broken down into smaller blocks. You can then build and set to work one block at a time then add the next and so on. This...
  11. WHONOES

    Ignition Coil Driver Questions

    OK.
  12. WHONOES

    Ignition Coil Driver Questions

    I'm drip feeding you the various parts. The part that provides the 200V pulses is the final bit. I am trying to get you to build a bit at a time and get it working. If you, or anyone for that matter, builds a whole project in one hit and then finds that it does not work, you will not know where...
  13. WHONOES

    Ignition Coil Driver Questions

    See attached Pulse generation circuits. They are in two parts. The first part gives the pulse rate (period) whilst the second controls the pulse width. The two circuits achieve the same result in slightly different ways. The first "IGN Pulse Gen" uses up most of the spare 40106 gates left over...
  14. WHONOES

    Ignition Coil Driver Questions

    Heavans 19844 You are absolutely correct. I needed to know as it will be the load the pulse circuit has to drive.
  15. WHONOES

    Ignition Coil Driver Questions

  16. WHONOES

    Ignition Coil Driver Questions

    Surely 600Hz is two times to many. You seem to have assumed that for a 12 cylinder engine you get 12 bangs per revolution but as the engine is a 4 stroke you only get 6 bangs per rev' thus just 300Hz at 6000RPM.
  17. WHONOES

    Ignition Coil Driver Questions

    As requested in an earlier post, can you give me some idea of the input impedance of the ECU port. I expect it is purely resistive and could therefore be measured with a DMM. I have no experience with car ECU's so don't know what to expect.
  18. WHONOES

    Ups keeps tripping the CB

    Could you expand on your description, it quite brief and doesn't tell us much.
  19. WHONOES

    Ignition Coil Driver Questions

    Good. Glad you are having a go and getting results. As a point of interest, when doing simulations of this type of oscillator, it pays to set capacitor C1's initial conditions to 0V otherwise it may not start or take a long time to start.
  20. WHONOES

    Ignition Coil Driver Questions

    AS I said previously, the 7-0-7 is not mandatory, it was just what I hand to hand at the time. I see no reason why a single 12V secondary and single 230V primary should not work. Similarly, the 2 X 9V secondary and single 230V primary will probably work. You could use just a single 9V secondary...
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