Heater Question

[lpd]

Ok. I'm beginning my first project. Part are purchased, and the chassis is prepared to be punched. Now I have a question regarding my heater for 6SN7's. I am using a bridged rectifier, through two 4.7K capacitors to convert to dc (I haven't figured out what I will need for a resistor at the tail end to drop to 6.2VDC probably about .5 ohms give or take), but I also want to run a led light off of the heater.

Can I do this safely without introducing noise into the circuit or am I asking for trouble?

Is there another way to run a led for a power light?

Thanks

 

[kekso22]

but I also want to run a led light off of the heater

Put a resistor in series with the LED.
There will be no measurably noise added.

 

[anatech]

There will be no noise added, period. LED's are also used for quiet current sources and you are running it on DC, no pulses either.
Glow away dude.

-Chris

 

[richwalters]

Originally posted by anatech LED's are also used for quiet current sources and you are running it on DC, no pulses either.

Agree.....quieter and cheaper than zeners too ...

rich

 

[lpd]

Thanks guys. Its a cool aqua blue one and should look great with a hammetone finished chassis.