All Questions
11
questions
1
vote
1
answer
27
views
is Vov of a nMos always VGS - Vt?
Looking at this graph from Analog Circuit Design Discrete and Integrated by Sergio Franco, is it always true that Vov = VGS - Vt? or is this only true at pinchoff point?
- 31
0
votes
1
answer
340
views
How to shift 3.3V to 5V with 3.3V provided only
I am trying to control 5V LED using ESP32's 3.3V GPIO. I researched voltage shifting using NMOS but could not get it to correctly output 5V when simulated in Tinkercad.
Is it possible to accomplish ...
- 107
2
votes
1
answer
679
views
Why did this MOSFET blow up?
I have a DC drill with adjustable speed. I would like to add a battery protection circuit which shut-downs the motor if the battery voltage is too low. I would like to use the built-in slide switch ...
- 23
0
votes
3
answers
55
views
Can I use the P3020L Mosfet with 5>Vgs>3 without any linear region consequences?
So I've been searching for a long time, for a power mosfet I can switch safely at a Vgs of 3V. I'd like to know if this is the one, because luckily, I recovered it from a computer power supply, thus I ...
- 146
0
votes
3
answers
289
views
Which voltage is lower, 0V or -1V for connecting a MOSFET's source terminal?
In an NMOS transistor the source should always be connected to the lowest voltage. Does this mean that if the source was originally grounded, but then the drain was connected to -1V that the source ...
- 578
0
votes
2
answers
1k
views
How to fix an N-channel MOSFET that's always on, without using resistors
First things first: I'm very new to electronics
Getting right into it: I am trying to use an N-channel MOSFET as a LED strip light switch, with 12V at 1.5A supplied to the source and 4.5V from a ...
- 309
1
vote
2
answers
763
views
Suitable NMOS with 3.3V gate voltage to switch 12V 500mA
I've got a circuit board with a D2PAK NMOS pad that I need to find a mosfet that will work with a raspberry pi's 3.3V GPIO. This is the current one I'm using and it isn't working well. https://www....
- 11
1
vote
0
answers
47
views
finding two drain currents
below I have the following problem along with the circuit's picture
My analysis is as follows:
for G and D open
\begin{equation}
I_{D1}=I_{D2}\hspace{10mm}therefore\hspace{10mm}V_{ov1}=\:V_{ov2}
\...
- 299
2
votes
2
answers
9k
views
How to find threshold voltage of an NMOS with BSIM3v3 model in LTSPICE
I want to determine the threshold voltage of an NMOS from a bvsim3v3 model in LTSPICE(Not a specific one I'm asking generally for this model). I can't get it directly from the parameters so I want to ...
- 359
0
votes
1
answer
127
views
Voltages to keep my circuit running at 200mA with NMOSFETS
Im trying to build a circuit to send information using IR led, using pulse signals
my leds (TSAL6400) operates at 1.35V, and their maximum pulse current is rated 200mA
After struggling a bit with ...
- 227
28
votes
5
answers
4k
views
Why old PMOS/NMOS logic needed multiple voltages?
Why does old PMOS/NMOS logic needed multiple voltages like +5, -5, and +12 volts?
For example, old Intel 8080 processors, old DRAMs, e.t.c...
I'm interested in the causes on the physical/layout ...
- 3,219