Capacitors and slowly increasing brightness of bulb

Samsonwit's picture

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Joined: Nov 11, 2020

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Capacitors and slowly increasing brightness of bulb
November 11, 2020 - 7:59am

Given 2, 100 microF capacitors, AC or DC power source, any resistors, a switch, and a lamp (max voltage 5v). How do you make that lamp slowly power on to full brightness in 8-10 seconds. What would the circuit look like too?

 

Samsonwit's picture

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Joined: Nov 11, 2020

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Hi

Sourav Gupta's picture

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Joined: Feb 12, 2018

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What kind of lamp? What is the specification of the power source?

Michal Podmanický's picture

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Joined: Nov 06, 2020

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I would propose circuit like this:

(simply and enough for your purpose)

aaa.png

 

Of course its a draft, you have to pick right power transistor according wattage of your light. Also ensure enough base current to fully open the transistor (after C charged) but not too much to force the Led current too fast, so choose the correct base resistor.