All Questions
7
questions
0
votes
1
answer
538
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How do I choose a transistor to operate in active/linear mode?
Short version:
I want to operate a transistor (of any type, but presumably MOSFET/BJT) in its "partial" on state to regulate current through various LEDs, but I'm not sure what transistor type to use, ...
- 1,172
3
votes
2
answers
1k
views
Is this circuit linear or not?
I designed a current source circuit for driving LEDs. This circuit works fine and supplies constant 2.5A. I wonder if this circuit is linear or not.
simulate this circuit – Schematic created ...
user163609
0
votes
1
answer
129
views
Secondary linear lamp circuit interrupter switch
Following on from this answer to a previous question from a while back, I want to add a new lamp (with its own button/switch).
The new lamp should be controlled separately (i.e. not controlled or ...
- 1,089
2
votes
0
answers
141
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Input selection circuitry for USB/battery
I'm making a development board, and trying to sort out the input selection circuitry, where if a battery (3.7V lipo) and USB is connected at the same time, it doesn't damage the circuitry, by stopping ...
- 103
16
votes
4
answers
6k
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Can a power MOSFET for switching application be used as a linear amplifier?
Power MOSFETs nowadays are ubiquitous and fairly cheap also at retail. In most datasheet I saw power MOSFETs are rated for switching, without mentioning any kind of linear applications.
I'd like to ...
4
votes
3
answers
210
views
What precisely is \$R_{ds(on)}\$?
I keep getting conflicting answers on this and it's absolutely killing me. Some say \$R_{ds(on)}\$ is the contact resistance in the FET (for instance, make many FETs of varying channel lengths, turn ...
4
votes
2
answers
8k
views
Designing stable PMOS voltage regulator
As a follow-on to the question "Using forward voltage drop of diodes with linear regulator" I am looking into designing PMOS voltage regulators.
General Topology
A common problem with the ...
- 5,219