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  1. Rleo6965

    is this chirping from the electrical wiring?

    Oooops.Sorry. :)
  2. Rleo6965

    is this chirping from the electrical wiring?

    the cause was already found a few posts ago ;)
  3. Rleo6965

    Using UK 240V equipment on USA 110V?

    It's ok to use 50hz with correct stepdown adaptor. As long that appliance does not have 50hz ac motor.
  4. Rleo6965

    Need help with microswitch wiring

    Very unusual connection. :) Can you post close up picture of wiring connection on terminal of 6 push button switch. Another close up picture on LED wiring and the battery source. This way we can analyze your connection properly.
  5. Rleo6965

    How UC3845 Control Pin work?

    It's very hard to interpret your diagram. It just like component arrangement in pcb. I can give you advise how to add those required circuit. But you need to convert it first to schematic diagram.
  6. Rleo6965

    Need help with microswitch wiring

    Post picture of your wiring connection of your LED and push button switch. You might need not to buy another one. Probably you connect it wrong.
  7. Rleo6965

    multisim questions

    In normal practice. We don't place high value resistor in series between voltage source and Vin of IC regulator. This will result too much voltage drop below Vin required voltage resulting drop unregulated vout.
  8. Rleo6965

    How UC3845 Control Pin work?

    Very good design of scr type cdi. The uc3845 have over voltage pin2 and over current protection pin3 and also turn off signal from trigger circuit to turn off uc3845 pin1 when high voltage capacitor was discharging. Hope that uc8345 inverter circuit still run with weak battery of +11V...
  9. Rleo6965

    How UC3845 Control Pin work?

    You must find a real working analog cdi circuit to be able for you to build one successfully. Specially if your only new in electronics. I've able to build multiple spark cdi from the internet. But it have lot of problem such as CDI will not work if Battery voltage less than 12V. Frequent...
  10. Rleo6965

    How UC3845 Control Pin work?

    Firts time to see this kind of circuit for CDI. Pin3 over current sense input use to shutdown the High Voltage Inverter Circuit for 1uF 300V cap. Trigger circuit should be connected to gate of scr or IGNITION. CDI circuit was not complete.
  11. Rleo6965

    Small pre-amplifier K8084

    Normally, we place spst switch in the primary of transformer. If you place switch in secondary. You need dpst switch with current rating higher than your power supply drawn.
  12. Rleo6965

    Small pre-amplifier K8084

    VB wire and center-tapped wire from transformer was still connected to the board bridge rectifier power supply circuit. Causing to power supply to work only in half wave rectifier thus you still have dc voltage supply of amplifier. But at lower voltage and poor filtering.
  13. Rleo6965

    CRT anode voltages

    If you look closely on the diagram. A2 and A4 was connected together. A1,A2,A3 and A4 were fix dc voltage. Grid and cathode have varying voltage depends on configuration of video amplifier.
  14. Rleo6965

    how to disable the flashing LED

    Please give us the name or part number of that small black transistor near small board. We need that info so we can determine the base, collector and emitter of transistor.
  15. Rleo6965

    Timing coil transistor output to transistor?

    Planning to sell my Multispark CDIS but I still have not enough budget to mass produce it. Already created smaller pcb 5"X3" footprint for smaller aluminum casing. Please see your original diagram. I add 2 resistor to your circuit. Hope this help. Any news of your new oscilloscope...
  16. Rleo6965

    Timing coil transistor output to transistor?

    Here is the video of my Multispark CDIS under test, Picture of my prototype CDIS installed in my Mitsubishi Lancer EL 1996 using Distributor Transducer as trigger signal source. Note : Distributor Assembly wire was modified to adapt with CDIS ( right side of picture ) Designed...
  17. Rleo6965

    Timing coil transistor output to transistor?

    That scope will be suitable for testing your project and save you lot of time to finish it. Buy extra X10 probe. So that you will able to test the primary coil of ignition coil which maybe around 200V PP. ( DO NOT USE TO TEST THE SECONDARY HIGH VOLTAGE). I hope I have that scope when I'm...
  18. Rleo6965

    Timing coil transistor output to transistor?

    Oops. You placed 1N4007 in wrong polarity. Any signals passing 1N4148 will be directly pass to 1N4007 to ground. Might as well removed 1N4007 and circuit will still work. Also change value of 100K resistor into 1K. That 100k was to much for 1.6V timing sensor output voltage and might not enough...
  19. Rleo6965

    Valve (tube) amplifier schematic help

    After you finished building this tube amplifier and if you can hear annoying humming or 60 hz sound on the speaker. You need to use +12V dc on the heater of vacuum tube amplifier. You can still use ac on heater but you must twist the wire and keep it away from wires or components of input...
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