2
votes
Driving a permanent magnet DC motor with PWM via optocoupler and an N-MOSFET
Your circuit is able to switch load current on and off very well, since the MOSFET is behaving like an open or closed switch. If you were to plot current \$I_L\$ through the load, be it a motor, a LED ...
- 47.1k
2
votes
817 optocoupler input terminal voltage and current
The voltage across a lit LED is determined by the chemistry of the LED and its colour, and only varies slightly with varying current.
The series curent-limiting resistor that we use with an LED will ...
- 60.7k
1
vote
How to figure out why (isolated) USB hub IC fails to be enumerated
I am afraid your USB2514B design has a serious deficiency. Pins 14 and 34 must be carefully bypassed by 0.1uF ceramic caps. Here is a snap from the manufacturer's application checklist:
Try to solder ...
- 42.4k
1
vote
Driving a permanent magnet DC motor with PWM via optocoupler and an N-MOSFET
You must take in account that a DC motor running, will generate a EMF in their terminals. A simple model of this motor could be a armature resistance, armature inductance and voltage (EMF) that is ...
- 1,787
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