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  1. Rleo6965

    COUNTER ELECTROMOTIVE FORCE

    @phoenix4031 Your the arrogant. Look steve have 7,122 post. He will not last 100 post if he was what you said.
  2. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    Happy to hear for your successful project.
  3. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    You should use RS232 standard software or hardware and handshaking to avoid missing bits or data.
  4. Rleo6965

    need help ? How would an analogue alarm work with a digital clock

    You can connect small magnet and reed switch to mechanical ringer of the analog clock.
  5. Rleo6965

    Driving primary isolated mosfets

    What particular IRF h-drive IC your using? You need to understand bootstrap capacitor and diode. I hope this can help you. http://www.irf.com/technical-info/designtp/dt98-2.pdf
  6. Rleo6965

    What size cap do I need?

    Can you use separate power supply for 24V motor? Is that AC or DC? IF AC motor, you placed a zero voltage crossing detector to trigger turning on of motor to avoid high current emf.
  7. Rleo6965

    Testing resistor

    How about placing jumper wire as temporary switch contact. This is to rule out defective switch.
  8. Rleo6965

    Charging a cell phone (Android) from 12v

    I just remembered that I modified or solder jumper wire on Car USB Charger for my Omnia2 last 2009. I short pin2 and pin3. I think placing short or resistance will determine charging current. So. I short the it to have faster charging current. USB PIN Connection. Pin1 = +5V DC Pin2 = DATA-...
  9. Rleo6965

    Testing resistor

    Have you tried directly test resistance of 4 wires.? not including diodes .This could be 2 heating element.
  10. Rleo6965

    Testing resistor

    36.5 °C here
  11. Rleo6965

    Breakout for IDC header

    You don't need to solder the ribbon cable. Just select necessary count of wires for required current in connector and solder all together. i.e. in parallel connection. This will also the same with other end of ribbon cable connector.
  12. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    @anhnha Did you mean that you can send loopback signal to rs232 port with breadboard connected and have no power? That's interesting. How about isolate first. 1. Remove your rs232 / rs486 breadboard and run your loopback program. You should not receive signal. 2. To test if your RS232/RS485...
  13. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    @Harald Your correct. Most of our RS485 circuit does not use NE555 because RE and DE were tied to controlling output of a SIO controller.
  14. Rleo6965

    Charging a cell phone (Android) from 12v

    Try this circuit. It have 5A output current. http://www.eleccircuit.com/wp-content/uploads/2007/05/power-supply-5v-5a-by-7805mj2955-for-digital-circuit.jpg
  15. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    @Harald Thanks for the explanation.
  16. Rleo6965

    propblem with RS232 to RS485 Pleased help!

    \what is the function of NE556 in the rs485 circuit? I think RS485 does'nt need that NE556.
  17. Rleo6965

    power supply problem

    You can use your +5V power supply for -5V supply. Just connect the dc output wire to corresponding polarity of your load.
  18. Rleo6965

    Driving primary isolated mosfets

    Please post circuit diagram.
  19. Rleo6965

    Test Equipment Importance

    You got me there. Ha ha ha
  20. Rleo6965

    Test Equipment Importance

    You may want to add following item on your list. 1. Soldapult desoldering tool 2. Desk lamp w/ Magnifying Glass to see those small cracks on pcb or components that causes intermittent problem.
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