DC source, Capacitor and LED

Thread Starter

dipto

Joined Jun 11, 2015
4
I have connected a variable capacitor and a LED in series with a DC 9V source. When I vary the capacitor , the brightness of the LED changes. But how it happens?
 

dl324

Joined Mar 30, 2015
11,013
I have connected a variable capacitor and a LED in series with a DC 9V source. When I vary the capacitor , the brightness of the LED changes. But how it happens?
The capacitor will conduct until it's charged. Post a schematic for a better answer.
 

MikeML

Joined Oct 2, 2009
5,444
I have connected a variable capacitor and a LED in series with a DC 9V source. When I vary the capacitor , the brightness of the LED changes. But how it happens?
Means that the variable capacitor is shorted. Test it with an Ohmmeter.
 

wayneh

Joined Sep 9, 2010
16,398
Your 9V source may be pulsing, and the capacitor can pass current will charging. But you'd need a large capacitor for this. Mike's answer seems more likely.
 

Thread Starter

dipto

Joined Jun 11, 2015
4
Your 9V source may be pulsing, and the capacitor can pass current will charging. But you'd need a large capacitor for this. Mike's answer seems more likely.
no, its just a 9V battery
Your 9V source may be pulsing, and the capacitor can pass current will charging. But you'd need a large capacitor for this. Mike's answer seems more likely.
 

Techno Tronix

Joined Jan 10, 2015
139
I think there is 9-volt battery and connect to a 470Ω resistor which is in series with a 100K potentiometer connected to an LED. We use a protection diode in this circuit so that if the 9-volt battery is inserted the wrong way, the LED can be protected from reverse current.
 
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