cpcarranza
Members-
Posts
9 -
Joined
-
Last visited
Never
cpcarranza's Achievements
Newbie (1/14)
0
Reputation
-
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...
-
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)
-
Electronic Ignition (Transistor + points)
cpcarranza replied to cpcarranza's topic in Electronic Projects Design/Ideas
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. -
Electronic Ignition (Transistor + points)
cpcarranza replied to cpcarranza's topic in Electronic Projects Design/Ideas
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? -
Electronic Ignition (Transistor + points)
cpcarranza replied to cpcarranza's topic in Electronic Projects Design/Ideas
Sorry, -
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....