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Circuit input Analysis

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rocky79

New Member
Hello fellows,

I am having hard time understanding what the greened part of the circuit does.

Vin can change from 0 to 28v and it may experience voltage spikes.

My question is how do you analyze this circuit and what is the purpose of this darlington transistor.

Thanks in advance
 

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audioguru

Well-Known Member
Most Helpful Member
The darlington amplifies the current from the 1k resistor that feeds the 28V zener diode then sends about 26.5V to the next regulator.
 

dougy83

Well-Known Member
The darlington & zener limit the voltage to what audioguru said, the caps and inductor filter out a bit of the noise presented to Vin.
 
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