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How to calculate this two transistors Constant Current Source circuit?
I came across a constant current source calculator at Electronic Product website:enter link description here
For example, for a 13.5V input, 300mA output, it comes out the following parameters:
<...
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Limiting resistor for zener voltage regulator driven by transistor
I have this circuit:
simulate this circuit – Schematic created using CircuitLab
And I would like to understand why I need a limiting resistor for the current flowing through D1. I know the ...
- 561