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Author Topic: A silly question Darlington transistor vreg  (Read 1681 times)

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Offline electronics manTopic starter

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A silly question Darlington transistor vreg
« on: January 20, 2014, 06:40:33 pm »
I am out of 7805 and 7812 voltage regulators. I know a Darlington transistor connected to a voltage devidor can be used as a voltage regulator is this ok and is there anything I need to know.
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Offline Dave

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Re: A silly question Darlington transistor vreg
« Reply #1 on: January 20, 2014, 06:55:38 pm »
Just out of curiosity's sake, please draw a schematic of this solution. I REALLY want to see this.
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Offline electronics manTopic starter

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Re: A silly question Darlington transistor vreg
« Reply #2 on: January 20, 2014, 07:35:19 pm »
sorry if the schematic isnt very good
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Offline madires

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Re: A silly question Darlington transistor vreg
« Reply #3 on: January 20, 2014, 07:45:16 pm »
Please see figure #5 at http://www.bristolwatch.com/ele/zener_power_supply.htm for a simple voltage regulator with a darlington BJT. Instead of the zener you could also use a TL431 with a voltage divider connected to the output.
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Offline electronics manTopic starter

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Re: A silly question Darlington transistor vreg
« Reply #4 on: January 20, 2014, 07:59:03 pm »
I will breadboard it and give it a go.
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