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13 votes
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Powering and dimming a few hundred light bulbs

DO NOT drive it AC (mains) power! AC mains installation/implementation expert here. AC mains power is much more dangerous and requires great care. It will create a huge mess when a bulb burns out, as ...
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7 votes

Please verify tube AM radio transmitter

No, it will not work. There are about five major issues, nevermind the absent part numbers and component values. There also isn't any modulation going on; if we are to assume the input (if that's ...
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6 votes

Powering and dimming a few hundred light bulbs

No need for 12V - totally impractical. If the bulbs are already wired in parallel then someone messed it up and it has to be all redone. You’ll be making series strings of 10 bulbs, and those strings ...
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3 votes

Powering and dimming a few hundred light bulbs

I'd consider 48V strings - 1/4 the current of 12V but still plenty of choice of PSUs and components (with MOSFET PWM dimming) and without the safety hassle of mains. 272 bulbs would divide by 4, so ...
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  • 2,101
2 votes

Powering and dimming a few hundred light bulbs

Firstly, why 5W LED as replacement for 5W halogen? They will be many times as bright, probably blinding! Do you really want a light output similar to 10kW of filament lamp? Using mains voltage LED ...
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1 vote

Mixing light from multiple leds

Consider a construction like it's used in small TFT backlights. The LEDs inject the light in the side(s) of a transparent plastic panel. The back side of the panel has a white reflector and the light ...
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  • 1,889
1 vote

Earthing requirement according to power supply

It all depends on where your 24V comes from. SELV is isolated from the AC supply. PELV or FELV aren't, and probably need earthing unless your kit is all double insulated.
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1 vote

Please verify tube AM radio transmitter

This PL500 is nice to look at but not a good choice for a start. It is designed for a power range of around 20-60 W and it is far from easy to let it run at only e.g. 10 mW. Why not start with a ...
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  • 1,889

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