Detect 220V signal
Tumbler
Posts: 323
Heys
I need to detect 220V AC signals, for logging with a BS.
My first attempt was using a resistor in serie with a optocoupler (led).
But i had to use a 2Watt resistor. Wich is too much.
So i came up with this idea.
And my question is: is this gunna work?
I need to detect 220V AC signals, for logging with a BS.
My first attempt was using a resistor in serie with a optocoupler (led).
But i had to use a 2Watt resistor. Wich is too much.
So i came up with this idea.
And my question is: is this gunna work?
Comments
Attached a schematic,
but will this work?
so i think i need 220K/0.25W resistor (R1)?
transistor as a HV in detector . Works wonders .
I'd go with Mike's transformer solution, overwhelmingly on grounds of safety.
Certainly in my hands, it would be better to just have to guard the route from the Mains voltage to the transformer, with all components on the secondary side inherently safe.
But then I always play safe with Mains voltages ... having experienced the occasional shock when taking shortcuts!
Regards,
T o n y
Is this just to detect the presence of 220V or do you want any analog characteristics of the 220V?
If you want some response delay, use the cap, otherwise leave it out. I would use two or four resistors though, they have to dissipate a little. Very simple and reliable, at least for the 120v circuits I have been using them with.
Is it no way you can just find a power supply from something you don't use anymore (like a charger from a Nokia cellphone) that outputs just a few volts?
I was into kinda similar problems when wanting to detect a compressor motor running or not. The easiest way was to connect to the coil side of the relay that runs by 12V DC and an optocoupler at the other end.
with the NEON bulb Idea I was taking about youre using a normal Neon NE2 like bulb and letting its light activate a second device CDS Photodiode or Photo transistor .
Neon bulbs rated at 220 AC are common in the industry and many are seialed so there safe to touch .
Here is a 110V one http://www.radioshack.com/product/index.jsp?productId=3017351
Forrest Mimms used a similar idea many moons ago with a LED and a soda straw and a LED like cased photo diode to make a custom Optoioslator
https://www.elfa.se/elfa3~eu_en/elfa/init.do?item=33-465-52&toc=0
Not a bad idea, really.
The only bad thing this bulbs only last for 3000 hours, 125 days.
I don't have room for 30 chargers
@ Beau, just detect if the fuses on or off. And looking for the cheapest way. I think i will go for some resistors and a capacitor.