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Old 20th April 2017, 02:49 PM   #1
losacco is offline losacco  United States
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Default Power on LED

Wanting to add a power on LED to my F5, any suggestions on the best way to do this?
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Old 20th April 2017, 02:56 PM   #2
Zen Mod is offline Zen Mod  Serbia
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ppl didn't replied in other thread ?

best way to add power LED is to mount it and route voltage to it

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Old 20th April 2017, 03:03 PM   #3
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Don't forget to add a series resistor to limit current. Otherwise it will glow quite bright (but short).

2.5 mA is enough with modern LEDs for a normal glowing LED. So: (U - Uled)/0.0025 = x Ohm. Uled is dependent on color but 1.8V is OK for green/orange/red LEDs. White and blue ones need 4V.

If you like the LED to light your living room you can calculate for 10 mA.

I don't now how you built your F5 and with which PSU but you can use either the positive or negative rail to feed the LED.

Some wind a few extra windings on the toroid for a few Volts just to power the LED. You will need a diode and filter cap in that case to rectify the AC voltage. Elegant but more work.
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Last edited by jean-paul; 20th April 2017 at 03:10 PM.
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Old 20th April 2017, 04:07 PM   #4
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Or make a tube preamplifier and use the led in the cathode as quasi fixed bias stage. A bit bulky, but still effective :-)
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Old 20th April 2017, 04:45 PM   #5
ColinA is offline ColinA  United Kingdom
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All you need is
A relay,
A power supply
An LED.
all matching voltage. (I used 12v)
A little searching on evil bay will soon find them quite cheap.
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Old 20th April 2017, 04:53 PM   #6
Bare is offline Bare  Canada
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A resistor and an LED is too simple ?
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Old 20th April 2017, 04:55 PM   #7
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Yes. Also, if you have AC, also can use a capacitor of proper value, and avoid wasting power and creating (more) heat.
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Old 20th April 2017, 05:12 PM   #8
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Quote:
Originally Posted by Bare View Post
A resistor and an LED is too simple ?
+1
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Old 21st April 2017, 07:31 AM   #9
juma is offline juma  Germany
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Quote:
Originally Posted by ColinA View Post
All you need is
A relay,
A power supply
An LED.
all matching voltage. (I used 12v)
A little searching on evil bay will soon find them quite cheap.
A microprocessor to control the relay would be needed too, I suppose ?
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Old 21st April 2017, 11:20 AM   #10
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In that case I would include a display monitoring if the LED works OK. Possibly a touch screen to reset faults.
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Last edited by jean-paul; 21st April 2017 at 11:23 AM.
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