The Shop > Electronics & IC Programing
Led voltage indicator
Darren:
Hi Chris,
That looks great and I may just make one at a later date for my valve amplifier when the time comes. Thanks for posting all the info, whilst I play with valves ok with ic's they just do my head in :lol:
I tend to blow them most of the time. I know, I know, it's a lack of education :)
One question, can this circuit run off the same power supply it's measuring?
Chris_b:
Hi Darren
Valves are good :-) you could use it as a level meter if you rectified the audio. But I'm not offering to design one of these with valves ::)
As far as running off what you're measuring, the answer's not really. You need at least 3 volts on the supply before there's enough to turn the leds on at all, and the maximum input voltage has to be less than the supply by a volt or so. I just tried my (10 volt) circuit on a variable power supply with the input connected to the supply. It lit random blocks of leds as the supply volts rose until it got to about 8 volts, then worked ok after that.
Chris
Darren:
OK ok then,
I had an idea to monitor the 10V that power the heaters on a valve amp. It will remain pretty constant though.
Still I could add another PS transformer without much problem.
Bernd:
Hi Chris,
Nice circuit design. I've played with small circuits like that.
I have a light level indicator that I built from a kit. It works pretty good. I'll have to find it and post a pic of it.
Bernd
Instead of cluttering up this thread with another post I'll modify this post and post the pics of the light level indicator in this post.
This is the light level indicator. As you can see it uses an LM339 comparator chip and lights the 5 LED's, four red and one green. The back side holds the battery which is about 3/4" in diameter. The chips are what is known as surface mount chips. I assembled it from a kit. I really like soldering. My dad taught me that at a very young age.
Component side and trace side.
Back side.
sbwhart:
Nice one Chris :thumbup:
Those cercuite things are beyond me:- much o respect o :bow:
I'm shure the chaps will put this information to good use. :whip:
Cheers
:wave:
Stew
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