***Official Electronics Thread of Officialness (it starts off with lots of Nixie Tube Clock goodness
- Thread starter Aod
- Start date
I have a Uni-T UT70B which is quite nice. it's autoranging, seems to be reasonably accurate, and has an RS232 connection for data-logging on a PC (works in windows 7!)
Only complaint is that it isn't a True RMS meter, so rapidly fluctuating things like PWM power-draws like what you'd see on a flashlight sometimes give funny readings.
Only complaint is that it isn't a True RMS meter, so rapidly fluctuating things like PWM power-draws like what you'd see on a flashlight sometimes give funny readings.
Good luck, but you don't really need it, it's an easy build
yeah! just make sure you don't short circuit anything
highly unlikely, Caps only blow if they're really badly mistreated. what's much more likely is that it just won't work
those are the polarity indicators, yes, but a capacitor that isn't correctly installed is unlikely to explode, but the circuit simply won't work
Niiiiice!
Noob project for a noob electrician:
Voltaic Pile? Awesome!
what are you using for the zinc?
Just aluminium foil. They're further away than Copper and Zinc in terms of reactivity anyway. The electrolyte is pieces of kitchen roll soaked in a vinegar-salt solution, and it's a stack of 10 in all. Took it from the dangerous book for boys and improvised a bit
Nice! what sort of open-circuit voltage were you getting? a copper-salt-zinc pile should get one volt per group
Hey guys,
I'm looking for a power supply for driving individual high-power LEDs from mains, the PSU needs to accept 230v AC and output 3.3v DC, Ideally it also needs to be capable of regulating the output current to a max of about 3A
If you can't think of anything then I suppose one without current regulation would work if i coupled it with a standard flashlight driver circuit...
Anyway, link me up please
I'm looking for a power supply for driving individual high-power LEDs from mains, the PSU needs to accept 230v AC and output 3.3v DC, Ideally it also needs to be capable of regulating the output current to a max of about 3A
If you can't think of anything then I suppose one without current regulation would work if i coupled it with a standard flashlight driver circuit...
Anyway, link me up please
Yep, it'll work fine. be careful not to short anything as PC PSU's can deliver rather impressive amounts of current
It's good to see this thread still going!
Nice acquisition there Burnsy! Remember your theory on Faraday Cages though! 
Nice acquisition there Burnsy! Remember your theory on Faraday Cages though!
Just picked up 16 Hivac XN11 tubes for £9 total at an auction
Wow! nice one!
Speaking frankly, you'll be a lot better off if you get a purpose-made RGB LED driver that deals with all the constant-current control for you.
Remember that LEDs suffer from thermal runaway due to being semiconductors, their resistance drops as their temperature rises, so if you don't have a current regulation mechanism in place you'll very rapidly end up with some friodes.