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220V 1000times a second transistor/relay? Answered

I need a transistor/relay that can operate under 220V and can open and close itself a 1000 times a second. Does such a thing exist?



First, with anything faster than 1Hz, forget about relays.

Second, with 220V, you mean AV? That would mean you will have to switch up to 310V peak. Doable, but will create a lot of electromagnetic noise - i.e. you will spam the radio frequencies. The sharper/better your 1kHz switch is, the more harmonic noise you will create.

Third, you said in another answer, you want to make a light bulb blink. Apart from the fact that light bulbs (incandescent) don't like to blink, you will not see a frequency much higher than 1Hz.

So, if you want to regulate the brightness of a bulb, just use a readily available dimmer (with phase control). If you really want them to blink, check out thyristors and triacs.

Just out of curiosity, do you actually think you will see a lightbulb blink at 1 kHz?!? The human eye can't even see lightbulbs blink at 0.06 kHz (which they do whenever you have them plugged into the wall).

With that kind of response, what you're really going to get is effectively a digital dimmer switch. If you change the frequency, the light will appear to get dimmer or brighter, but it will not appear to "blink," unless you go down below 16 Hz.

I know I'm not going to see it, that is the idea.


If your looking to make a strobe light most commercial strobes flash about 10 to 15 times a second or around 10Hz or so. As kelseymh said lights in the US are basically flashing 60 times a second since the AC power feeding them is operating at 60Hz. Once you reach about 30 flashes a second the human eye has trouble seeing the flashes. It will look like the light is just on.


And any old tungsten or halogen bulb does have a brightness sine-wave to it, but it doesn't even noticeably go brighter or dimmer during the 60hz cycle - it goes from a few thousand degrees +- a few tens...

Fast blinking calls for something that doesn't need to heat up and cool down - Say like an LED for example.

You can easily flash an LED at 1000 Hz with a simple 555 timer circuit - However as people have said you won't be able to see it flashing because your eye/brain operates too slowly.

The chance is that the light wouldnt even blink that fast but even if it did it you wouldn't be able to see it. On the asumption you arn't using the light for a strobe and you are using it for a PWM...

You can use MOSFETs. Just google it and you will find them and alot of tutorals but be sure to look at the datasheet and check the voltage, curent and switching speed.

What for?

Making a light bulb blink.

Why? What is the response of a light bulb? Will it turn off and on that quick?