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  1. Rleo6965

    Timing coil transistor output to transistor?

    Much better if you can provide voltage output of your timing sensor. This will help design or compute component to amplify the timing sensor signal for scr triggering.
  2. Rleo6965

    need help on computer power supply noise

    The way I understand the question was that his son have 2 computer power supply and 2 amplifier. He installed the power supplies in each amplifier as 2 separate unit. I assume that power supply still use its metal casing and still have the cooling fan. So there will no problem with ventilation...
  3. Rleo6965

    uln2003 data sheet question.

    Same here.
  4. Rleo6965

    Trying to fix board

    The board your fixing looks like LAN router or hub and use +5V to supply its IC. Check the 2 lower capacitors for +5V reading. Usually LAN board have LED indicators. You can use this LED to indentify problem of board.
  5. Rleo6965

    uln2003 data sheet question.

    "He will be back" :D
  6. Rleo6965

    DIY micro-usb phone charger with high current - not working?

    You need to know the value of resistor connected between pin2 and pin3 of your working charger. Then install same value in your "charger". You can experiment changing value of resistor to increase charging current.
  7. Rleo6965

    Programmable CDI

    This one was better. Because it have high voltage inverter transformer. Capable for multiple spark cdi.:)
  8. Rleo6965

    Programmable CDI

    It is a CDI. It has a capacitor in series with the ignition coil. But we don't know if its capable of multiple spark per cylinder.:o By the way. Do somebody know the name of tuning or ignition testing software installed on the laptop by designer?
  9. Rleo6965

    Voltage Stabilizer

    What are those small black top components? It looks like transistor. Never seen that here in Philippines.:D
  10. Rleo6965

    A challenge for you expert folks.....about tennis!!

    No need for special tennis ball. Ordinary tennis ballonly need to obstruct the XY infrared beam ( Horizontal and vertical arranged as grid ) before it hit the wall. Distance of beams from wall would be 2".
  11. Rleo6965

    A challenge for you expert folks.....about tennis!!

    Ooops. I have to delete my suggestion. CocaCola already suggested the XY coordinate with beam sensor.:) I think that's more reliable and simpler. No mechanical component to wear.
  12. Rleo6965

    Chronograph for bullets

    If you see underside of proto pcb. there's a strip of etch for each ic pin connection. This also have capacitance that affect high frequency signals. So cut with blade that etch that was not needed to reduce capacitance of etch. Also try to position crystal, capacitor and resistor osc...
  13. Rleo6965

    Chronograph for bullets

    Have you tried connect another 74HC gate inverter in parallel to Y2 to increase output voltage? You still have 2 extra gate.
  14. Rleo6965

    Relay Keeps Sticking Randomly

    Try this circuit. Included 2N222 pin configuration to avoid mistake swapping Emitter and Collector.:D
  15. Rleo6965

    how to find the rpm of a motor shaft using the change in the geometry of the shaft?

    Try using small Limit Switch with Roller.
  16. Rleo6965

    How car voltage stabilizer work?

    It's better to invest on car grounding kit specially if car was old or ground wiring connection were dirty or with rust. This will surely improve, stabilized car electrical.
  17. Rleo6965

    Chronograph for bullets

    Place a 100mfd 16V in parallel connection in your oscillator pcb to filter dc voltage +VCC supply and ground to filter voltage fluctuation and 0.1 mfd to filter high noise signal on +VCC. Don't tap +VCC supply in proto board. Connect pcb +VCC directly to Supply connector to avoid voltage drop.
  18. Rleo6965

    Chronograph for bullets

    If you encountering intermittent problem with your protoboard circuit ( 2nd picture ). Place some 1,000mfd and 0.1 mfd on +5V supply rail. This is to eliminate noise on +5V.
  19. Rleo6965

    How this ps unit works??

    P1 for adjustment of current limit and P2 for adjustment of dc voltage output.
  20. Rleo6965

    Chronograph for bullets

    You can test your probe by clipping it on scope provided test signal output called CAL. or Calibration.
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