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Author Topic: how to understand the functionality of circuit  (Read 5945 times)

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Offline audioTopic starter

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Re: how to understand the functionality of circuit
« Reply #50 on: February 06, 2022, 08:27:48 am »
Sir,                                                                                                   
Is there any way to include current limit indicator circuit. PFA.
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Online xavier60

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Re: how to understand the functionality of circuit
« Reply #51 on: February 06, 2022, 11:05:45 am »
One way is to use another BJT to sense the voltage between pins 2 and 3 with a resistor in series with the Base. The best resistor value might need to be found by testing. A 1K to start with.
The indication can never be trusted to be precise.

I guess it wouldn't hurt to drive an LED with a few mA using the REF pin as the supply.
« Last Edit: February 06, 2022, 11:08:51 am by xavier60 »
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Online xavier60

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Re: how to understand the functionality of circuit
« Reply #52 on: February 06, 2022, 11:18:03 am »
There is a chance that the indicator BJT might never turn on enough. To fix it, a high value resistor might need to be connected from the REF pin to the Base of the indicator BJT.
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HP 54645A dso, Fluke 87V dmm,  Agilent U8002A psu,  FY6600 function gen,  Brymen BM857S, HAKKO FM-204, New! HAKKO FX-971.
 
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Offline audioTopic starter

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Re: how to understand the functionality of circuit
« Reply #53 on: March 03, 2022, 04:38:03 pm »
Hi to all,

           How this circuit is having control on Current????
 
                                  R11 should be 240ohm or 120 ohm but in the circuit it is 4.7K. does this affect the q current of regulator.

          what is the function of T1,T2,T3,D8,D9 in current regulation???
« Last Edit: March 03, 2022, 05:26:50 pm by audio »
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