Lit Switch Power Supply - SSE - diyAudio
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Old 15th January 2016, 08:31 PM   #1
Zap is offline Zap  United States
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Default Lit Switch Power Supply - SSE

When I built my SSE I used these fancy switches with LED lighting, but I never got around to wiring up the lit portion of them. I'll have to verify the part numbers but they may be 5 VDC (or if not, then 12 VDC) and very little current draw (there are 4 switches in total - Power, Triode/UL, Cathode Feedback, and SS Power Supply).

My dilemma is I'm not sure what would be easiest method to do so. I obviously want to ensure I don't get any noise into the amplifier - would there be a need to isolate the supply? Could I still use the filament taps as a source?

Has anyone else done this sort of modification, and if so what did you build or use for this purpose?
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Old 28th April 2016, 09:55 AM   #2
Zap is offline Zap  United States
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Bumping this to see if anyone might have some input or prior art they've used. I haven't been able to address this yet, but would like to make the switches light up since this amp is the main one in use here at the house and sometimes it gets left on and idle by accident if others using it aren't looking closely.

The switches are equipped with a built-in resistor for 12VDC operation on the LEDs. Four switches, 20 mA each for a total of 80 mA when all are lit.

I know noise could be a concern, so I'm just trying to cover my bases.
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Old 28th April 2016, 03:02 PM   #3
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I don't know about the SSE, but on my TSE I built it in two chassis. All the power supple stuff in one chassis and the amp stuff in the other. In the power supply chassis, I have a 12v LED to show power on and a fan with a switch to turn it on or off. I put a small 12v power supply in the chassis to power the fan and the LED. I have noticed no noise at all with this power supple added. That is to my ear. Maybe if you broke out the test equipment you might detect something, but I can't hear anything, except the fan when its on. When the fan is off, the power supply is still on, and It does not seem to be detectable. Hope this helps.
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Old 28th April 2016, 04:02 PM   #4
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If you have an orphaned wall wart kicking around you could always try it just to see if you can hear a difference.
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Old 29th April 2016, 04:18 PM   #5
Zap is offline Zap  United States
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Quote:
Originally Posted by Guarnera View Post
I put a small 12v power supply in the chassis to power the fan and the LED. I have noticed no noise at all with this power supple added.
What type or specific supply did you use? Is it a small switching supply? Thanks!
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