current limit for led

155

03:32:25

here, something problem in this circuit. when we increase volatage 2 to 2.1 or above. LED will be crashed. but here we connect zener diode of 2 v in reverse bios ,..so when we increse volatge current in zenar diod should be infinite but here nothing happen like that. plz help

published 11 years ago

keyurrakholiya

11 years ago

what is my mistake in this circuit?

hurz

11 years ago

Voltage sources are perfect in EC and can give you any current you want. You need to simulate a more realistic voltage source by adding a serial resistance.

keyurrakholiya

11 years ago

thnks hurz....now observe. is there any fault?

hurz

11 years ago

Yes, both diodes, led and zener, do have a nominal threshold of 2v. Not talking about production, temperatur and ageing effects.... you can not make them work in parallel at same threshold. What you need is a zener at e.g. 4.7V and an additional resistor for your led.

saley

9 years ago

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