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  1. Rleo6965

    Homemade 555 Tachometer

    You can find lower tach signal voltage on driver transistor of coilpack which less damage to input of your tach circuit.
  2. Rleo6965

    Fixing Noise?

    Probably smps power supply have sense overcurrent causing to vary its dc output and becomes static noise.
  3. Rleo6965

    help..can you tell me the value of this capacitor?

    Use Capacitance Meter.
  4. Rleo6965

    SMPS power supply

    Try to add additonal load to its dc output. Just to islolate problem.
  5. Rleo6965

    How to interpret Mosfet RDS ON resistance?

    Thanks for the info. How come I missed the meaning of small character m was for milli? ;)
  6. Rleo6965

    Rest in Peace, Kris

    It's been a long time that I did not visited this forum. I'm shocked and very sad to know the Kris have passed away. He was a kind man and willing to help answer even a simple or complicated question of visitors in this forum. I will miss you Kris .Rest In Peace Roger
  7. Rleo6965

    How to interpret Mosfet RDS ON resistance?

    I'm sure you can help me here. I've been searching in the internet how to convert the IRF640 Mosfet Rds (ON) 180M Ω into Rds (ON) 0.0XXX Ω. But I can't find the conversion. I'm not sure if its equivalent to Rds (ON) 0.18 Ω or 0.00018 Ω.
  8. Rleo6965

    Strange problem with transistors flipping current

    You may want to replace your TIP3055 into MTP3055.
  9. Rleo6965

    Shadow signal

    You can add 2 flip flop ic and an inverter to create that shadow waveform.
  10. Rleo6965

    Dumb question re. simple inverter

    Dougshter It seems I recognized your the simple inverter diagram. It was from the website that had intentionally change value of components in its schematic diagram. Probably to test the circuit analysis capability of the person that was interested on the circuit. They usually add "K" or add...
  11. Rleo6965

    Need help on converting 0-5v signal to 0-10v signal

    Look for opamp that an open collector output. You just need to place pullup resistor between output pin and +12V supply.
  12. Rleo6965

    12V - 350V 200mA converter for motorcycle CDI

    Pcb etch should be wider on high current circuit specially on emitter ground pcb. This will also help heat dissipate heat from power transistor, diodes and resistor.
  13. Rleo6965

    Designing a high frequency H-Bridge

    Try to use IR2153PBF. It's a combination of Oscillator and a H-Driver.
  14. Rleo6965

    ATX PSU 24v mod

    I'm just curious. Was it possible to rewind a ferrite transformer with 1:2 winding ratio. primary will be connected to original ferrite transformer of for 12V winding. This will result 24V on secondary winding . Just add new components filter circuit and rectifier to produce 24V.
  15. Rleo6965

    running a 12v .5A fan from 24v 6.5A source

    How about placing a 12V zener diode in series with the 12V dc fan.
  16. Rleo6965

    Advice on SMD Soldering

    *steve*. Thanks for the info.
  17. Rleo6965

    Advice on SMD Soldering

    It's very hard for us to buy 100% Isoprophyl alcohol here in Manila. Can I use Denatured alcohol?
  18. Rleo6965

    Advice on SMD Soldering

    I usually put small amount of solder flux to the smd ic bottom part of pins before soldering it to pcb. Solder flow easily and good connection. But my problem was to clean the small amount of solder flux on under the smd components on pcb. Does solder flux contains acid that may cause corrosion...
  19. Rleo6965

    555 voltage controlled oscillator question

    My mistake.KrizBluenz was correct. Pin6 that tied with pin2 will be a sawtooth voltage from charging and discharging of capacitor and within the range of threshold voltage 0-5V pin5.. NE555 will still oscillate even with +5V or lower voltage with corresponding change in frequency.
  20. Rleo6965

    555 voltage controlled oscillator question

    NE555 can still function on +5V on its VCC and therefore matched with yun 0-5V input voltage. But if your installing the NE555circuit to +12V supply. You can place a series resistor and 5.1V zener diode for the supply of 5.1V of NE555 VCC. This will solve matching of 5V vco input. Swap...
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