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Everything posted by cpcarranza

  1. So... If I use a MOSFET and I want it to switch fast a need to make sure that the gate has a high current and a voltage from 2v to 4v...
  2. 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.
  3. 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)
  4. Hi, Steven If I do a search, what should I be looking for... And do you know why is the reason for the VALUE of the base-emitter resistor in a PNP..., when I have to increase it or decrease it....? Thanks in Advance.
  5. I'm also thinking on using a NPN for automotive use, but I'm not pretty sure about if this circuit might work... I'm trying to keep it as simple and functional as possible... What do you think?
  6. 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....
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