band filter falls asleep

[Dr_Doggy]

In the first 3 leds of this circuit i have a capacitor but if I let this circuit idle for half a minute or so those leds will stop flashing, will this happen on the bench too?

 

[anand.usic]

Can you give more info on what exactly you are trying out?...

 

[Dr_Doggy]

this is just a circuit to test band filter frequency ranges

 

[Nigel Goodwin]

You need to post the circuit.

 

[Mikebits]

Based on the information provided, I believe this website is the best we can do.
**broken link removed**

Seriously, post your circuit

 

[Dr_Doggy]

ohya..........circuit

 

[Dr_Doggy]

ohya.....circuit!

 

[Roff]

I don't know what you are trying to do, but an LED will not work if it has a capacitor in series. An LED is a rectifier. The capacitor will charge up, and the LED will no longer conduct.
If you want the LEDs to be frequency-selective, use active filters, made with op amps and resistors and capacitors.

 

[Dr_Doggy]

does that mean i should reverse bias the led?
I am trying to make a parallel bus for all my leds but i want to control them independently with different frequencies.....
also i am trying to keep it small on each led connection, minimal parts ,, ie each inductor

 

[JimB]

Your circuit is a complete nonsense, it cannot work in any sensible way.

Why dont you just tell us what you are trying to do?

JimB

 

[Dr_Doggy]

like i said i want the led's in parallel, but control them individually, maybe there is a better way, but all i can think of is using pulse modulation.

in my diagram you can see I started with my capacitor low pass filter on the bottom led, then just above that is my high pass filter tests, in the top branch i have started to incorporate the cap and ind, to form a bandpass, obviously im going to need caps in each branch,

what about if I put 2 led's together reverse to each other? would that work?

 

[crutschow]

what about if I put 2 led's together reverse to each other? would that work?

Two led's in reverse parallel would indeed conduct AC, at least the portion of the AC that is greater than the forward voltage of the LEDs.