View Single Post
  #5  
Old 25th March 2019, 05:24 PM
bikerhifinut bikerhifinut is offline
Senior Member
 
Join Date: Jan 2006
Location: Penrith, Cumbria
Posts: 1,071
Default Re: KEL84 Bi-coloured LED

A quick thought.
If you simply disconnect the red LED wire, then it will only ever show green on switch on. If you leave it connected to the cathode circuit then it will slowly come on to full brightness as the amp warms up. Up to you whether you leave it like that or connect it into the heater supply. If you do this just make sure you use the correct value dropper resistor.

In the same vein, you can choose to have it showing red constantly, or by connecting both in parallel you'll get a constant yellow light which to me is the least annoying/distracting colour of the lot and that includes blue! Sorry Bob.
The comment about making sure the dropper resistors are correct values applies in all cases.

Andy.
Reply With Quote