jc
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Post by jc on Apr 21, 2015 17:14:27 GMT
For my Aclass pre I was originally going to rig up five LEDs to indicate the input selected (purely because I want to) but then came up with the idea of going more refined and having all inputs light with the main power, in say red, except for the one selected to light in green. Using e.g. this bi-colour LED instead on the two separate ones below. (FWD V 2v each leg, FWD A 20ma) I found the circuit below which seems logical to me; Closing the switch both illuminating D2 (green leg) and integrating R3 to then extinguish D1 (red leg). I guess I would need to supply all red legs with (20vdc) my power on supply, in parallel and have the selector switch for inputs operate the switch in the circuit, of which I would need one for each LED and adjust the Rs to suit. Does this sound reasonable or am I way off base?
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Deleted
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Post by Deleted on Apr 21, 2015 22:05:31 GMT
Hi Chris Sounds like a lot of hard work and possibly distracting a bit ? Even a too bright on/off LED can be a little distracting when using it for TV audio. If you have a spare wafer on your selector switch, why not use that with a high value resistor with the much more efficient newer clear LEDs ?
Regards Alex
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jc
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Post by jc on Apr 22, 2015 17:31:38 GMT
Alex, That was exactly my original idea, I was just thinking "flashier", plus I could also use the idea for the speaker protection on the amp, coming on red with protect and reverting to green when ready
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Post by Deleted on Apr 22, 2015 21:24:05 GMT
Alex, That was exactly my original idea, I was just thinking "flashier", plus I could also use the idea for the speaker protection on the amp, coming on red with protect and reverting to green when ready Hi Chris That would be worthwhile with valve amplifiers and other amplifiers that take a little while to sound their best, but the front end tracking in the Class A HA/Preamp and 15W PA, greatly reduces that time, and the LS delay is only about 7 seconds or thereabouts.
Regards Alex.
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