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cpcarranza

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Posts posted by cpcarranza

  1. Ok. So if I would use a power MOSFET like IRF640 (most common over here, rated at 200V) I can apply 1 or 10V to the gate and make it conduct... that simple...

    And if I want to use and inductive load..., is the same?


    What's the difference if I use a SCR or a TRIAC...?

    sorry for so many basic questions..., I'm still learning...  :-\

    Basicly I want to use them for driving relays and maybe automotive coils...

    Thanks for your help.

  2. Hello

    I'm studying how to use a transistor as a switch with the less heat as possible, but I hardly understand how to use the datasheet.

    I'm trying to use the 2n3055 transistor as a switch. acoording to the data sheet:

    VCE(sat)
    Collector−Emitter Saturation Voltage
    (IC = 4.0 Adc, IB = 400 mAdc)

  3. Hi, to all and wellcome to my project...

    I'M THINKING THAT THE STARTER LOWER THE VOLTAGE AND MAYBE THE TRANSISTOR DOESN'T TURN ON...

    I'm a hobist and I found an old article of how to make a transistor assisted electronic ignition with few components www.homepower.com/files/ElectronicIgnition.pdf, it included a MJ2955 [TO-3] transistor; a 1K 1/4W resistor for base-emitter; a 1 Ohm 25W resistor for the emitter [conected to the coil]; a rectifying diode across colector emitter for protection.


    The circuit did worked, but I had to crank the engine a lot some times, I try to make a small edition, so I chose a 5W resistor like in the picture, I kept using the same elements, then I change the transistor for a better one..., I chose a TIP36C and I TIP42C, all of them work when they want...so...

    I made some tests:

    1.- I conected the circuit to a 9V battery and a multimeter and simulate the points with a switch..., The circuit did worked...

    2.- I conected to the same 9V battery and to a small electric motor..., The circuit did worked...

    3.- I unplugged one of the leads of the spark plugs and conected to a sparkplug [not in the engine] and grounded; I conected the circuit to the coil and to the ground; I did NOT conected the points to the circuit, intead I left this one for touching the ground..., I opend the switch, The circuit did worked, I had sparks....

    4.- Same as four, but, I did conected to the points and move the engine with a wrench, The circuit did work, I had sparks too...

    5.- I went to the front, crank the engine and the the engine didn't start....

    post-10853-14279142341055_thumb.jpg

    post-10853-14279142341168_thumb.jpg

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