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Vintage threads from the first ten years

On/Off LED indicator light

12/7/1996 8:59 PM
Gregory Soh	On/Off LED indicator light I recall reading somewhere that a 3PDT switch can be used to incorporate an On/Off LED in a homebrewed effects box. But how should one go about supplying the power to the LED?

12/8/1996 8:00 AM
CJ Landry	RG Keen has that switch. His e-mail addr. is keen@eden.com and web is GEO -something? Anyway, it is a good idea and I know RG can help. Christian

12/12/1996 8:40 PM
Mark Hammer	Here's what you do. 1) wire up two of the poles to make a conventional true bypass. 2) connect your "power" LED to a resistor to limit current flow; assuming a 9vdc power supply, a 2.2k resistor should be fine. 3) connect the +9v line from the effect to the resistor/LED, the LED to the switch (as below), and the switch to ground. The LED will now turn on whenever the effect is engaged. Please note that the LED consumes power, and will reduce the lifespan of your battery. You can adjust the brightness of the LED by adjusting the value of the series resistor within the 1k-3.3k range. Brighter LED values will increase battery consumption. (I'll leave the current calculations to the techies). BOTTOM VIEW OF FOOTSWITCH to from FX FX to gnd [] [] [] LED 2.2k in[] out[] []-----

12/12/1996 8:40 PM

Mark Hammer

Here's what you do.

1) wire up two of the poles to make a conventional true bypass.

2) connect your "power" LED to a resistor to limit current flow;
assuming a 9vdc power supply, a 2.2k resistor should be fine.

3) connect the +9v line from the effect to the resistor/LED, the
LED to the switch (as below), and the switch to ground.

The LED will now turn on whenever the effect is engaged.

Please note that the LED consumes power, and will reduce the lifespan
of your battery. You can adjust the brightness of the LED by adjusting
the value of the series resistor within the 1k-3.3k range. Brighter
LED values will increase battery consumption. (I'll leave the current
calculations to the techies).

 
     BOTTOM VIEW OF FOOTSWITCH
 

 
             to    from
 
             FX     FX     to gnd
 

 
             []     []     []
 
                                  LED      2.2k           
 
           in[]  out[]     []-----

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