I apologize if this has been addressed, but I have looked everywhere AND I can't find an answer.
I recently built a tube amplifier from tube depot,(Model 16LS Stereo Integrated Tube Amplifier) and would like to add a indicator light for On/Off.
The indicator light will be a small "edison" style 110v lightbulb, so I would like to take the power right off of my spst switch, but I started thinking that maybe the lightbulb could induce some unwanted noise into my circuit. Is this thinking logical? From what I remember in basic electronics, would I just use a 1/1 transformer? or???😕
Any help is greatly appreciated!
I recently built a tube amplifier from tube depot,(Model 16LS Stereo Integrated Tube Amplifier) and would like to add a indicator light for On/Off.
The indicator light will be a small "edison" style 110v lightbulb, so I would like to take the power right off of my spst switch, but I started thinking that maybe the lightbulb could induce some unwanted noise into my circuit. Is this thinking logical? From what I remember in basic electronics, would I just use a 1/1 transformer? or???😕
Any help is greatly appreciated!
It is usual practice to place a 6volt (or 12Volt for 12Volt heaters) pilot lamp across the last valves heater. One could use an LED with a 1K resistor in series instead of the lamp for mounting convenience and neatness.
For Mains Live I would use a small neon indicator.
For low voltage power ON, I would use an LED with current limiting resistor.
One could use a LED for high voltage power ON, but the current limiting resistor needs to be extremely high value and fairly high power rating.
For low voltage power ON, I would use an LED with current limiting resistor.
One could use a LED for high voltage power ON, but the current limiting resistor needs to be extremely high value and fairly high power rating.
Incandescent lightbulbs do not create noise - they are just a hot resistance. OK, there will be thermal noise but this will be very small and can be completely ignored.
Neon lamps create a small amount of noise, but this can be ignored.
LEDs if fed from AC will generate switching pulses, but these can probably be ignored.
I suspect that the reason you could not find an answer is that this is a question which few people ask.
Neon lamps create a small amount of noise, but this can be ignored.
LEDs if fed from AC will generate switching pulses, but these can probably be ignored.
I suspect that the reason you could not find an answer is that this is a question which few people ask.
Thanks for all the input everybody. I want to power a 110v bulb, which will act as my "on" indicator, as well as provide aesthetic appeal to the project. Based on DF96's post, I can just grab the power from my on switch and not worry about noise being induced into the circuit. Does everyone agree?
I have used the heaters in the past to power indicator lights ...but for this project I'm using an Edison style bulb to enhance the appearance of the unit.
I have used the heaters in the past to power indicator lights ...but for this project I'm using an Edison style bulb to enhance the appearance of the unit.
All the other lightbulbs in your house are already connected to the power supply. Some of them may even be noisy CFLs or LEDs. Why would one more incandescent bulb make any difference? It would help us if you outline the thinking process by which you thought there might be a problem; then we can explain whatever it is that you have misunderstood.
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