cpcarranza
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Posts posted by cpcarranza
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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. -
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) -
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. -
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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....
Understanding Vce & Vbe (newbie)
in Theory articles
Posted
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...