Guyfrom7up
New Member
I've been looking around online for at least 4 hours trying to get a straight forward answer on how to use a transistor. Right now I'm building a USB battery pack (Gets charged through USB and charges devices, such as an ipod, through the same usb port) and I need help choosing and hooking up the right transistors. BTW I want to use JFET transistors.
These are the questions:
1) I need to use them as switches, as in (I'm making this up, I need the real answers:
If it's a P-Channel it conducts if 5 volts is applied to the gate and
doesn't conduct when 0 volts is applied
If it's a N-channel it conducts if 0 volts is applied to the gate and
doesn't conduct when 5 volts is applied
2) Do i need resistors to keep the transistor for blowing up? What values and where do I place them?
3) I here you need negative voltage for some transistors, is it possable to convert + into -? Or can I just use the 5v as ground for that part of the circuit and ground as -5volts.
Also if someone could point me to a good, and I mean good website that covers everything on transistors that would be great. I'm talking about NFET and JFET and bipolar and everything!
Thanks in advance!
These are the questions:
1) I need to use them as switches, as in (I'm making this up, I need the real answers:
If it's a P-Channel it conducts if 5 volts is applied to the gate and
doesn't conduct when 0 volts is applied
If it's a N-channel it conducts if 0 volts is applied to the gate and
doesn't conduct when 5 volts is applied
2) Do i need resistors to keep the transistor for blowing up? What values and where do I place them?
3) I here you need negative voltage for some transistors, is it possable to convert + into -? Or can I just use the 5v as ground for that part of the circuit and ground as -5volts.
Also if someone could point me to a good, and I mean good website that covers everything on transistors that would be great. I'm talking about NFET and JFET and bipolar and everything!
Thanks in advance!