All Questions
3
questions
6
votes
1
answer
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Should I calculate a resistor value for driving indicator LEDs from TTL outputs?
Traditionally I have always used a \$1\:\mathrm{k\Omega}\$ resistor as a current limiting resistor for driving an LED direct from a TTL (or 5V CMOS) output. I can't remember how I came by this value -...
- 56.3k
1
vote
1
answer
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Optimal method for multiple MOSFETs for LED driving with a shared power rail
I have three LEDs (RGB), with the following forward voltages and current:
red 2.25 V @ 0.35 A
green 3.3 V @ 0.35 A
blue 3.1V @ 0.35 A
I plan on using three (3) RFP30N06LE MOSFETs in parallel @ 0.35 ...
- 11
0
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1
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Digitally-controlled 0-10A constant current source for driving LEDs
I'm looking to build a circuit to drive single high-power LEDs. The circuit will be controlled from a series of TTL pins: one for enable/disable, and ~4-6 to set brightness via current.
The LEDs ...
