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I found the relevant info:
(source: https://www.magnet-schultz.com/en/electromagnets)
So I have to make an "intelligent" button which sends 3-5 of max 200 msec long pulses with 0,5s gaps.
DC 211V pulses... love it.
I plan to put on a diode parallel with the magnet and a MOV, do I need any...
I have the attached electromagnet in an industrial vacuum cleaner, it's used to knock the dust off the filter periodically.
It's control panel failed, and unfortunately it's fully covered with black synthetic resin.
I carefully peeled off the resin and managed to fix the vacuum motor control, it...
:)
Sometimes it's really hard to accept what math / physics say is in reality, in the real world, is a matter of touch or not to touch...
I think I'll go for IRFB7440PBF with 2,5 mOhm.
thanks everyone,
Zedman
Thanks guys,
I tried to put on 100nF + 100 ohm snubber, nothing changed.
That is true I can't measure the exact current, I used a multimeter.
I examined the Voltage on the motor on scope, it goes from 15 to 18V as load changes (motor runs) so the current does the same I think, so the 3A is...
Thanks,
I saw the 100 C rating but as I understand if I keep the temp under 100 C than 20 A could continously go through, and below 25 C 28 A.
So I would not expect this amount of heat at 3A.
I would like to replace the PWM switch (which is failed) in a DeWalt screwdriver with a simple on/off switch using a MOSFET to switch the high Apms.
I made this simple circuit, it does what it should but when runs in 1-2 seconds the FET gets really hot.
It runs from a 20V Li-Ion battery pack...
I suppose it's not a PIC12xx, I tried to read it with PICkit 3 and PICKit 2 but none of them recognize it reads everything as 0s.
Even if it's read protected it should show some non zero bytes after read.
Damn, I tought it'll be an easy task to clone this small circuit...
Dear All,
I had this soft start circuit before and now I decided to make a similar one for my band saw.
It was tricky to get it out of the synthetic resin I finally managed to figure out the circuit diagram (I hope)
but there's a 8 pin IC which had it's signs sanded down.
Could someone help me...
:)
It's easier and quicker to set the watch with this than to wait a day to check if it looses or gains...
Life a bit accelerated in the last 60 years :)
Iam going to use the pieso disc from a piezo beeper.
BTW I'm experimenting with the caps but noticed that despite the 9V Vdd the output...
Thanks,
timegrapher is a device to measure / graph the operation of mechanical watches, it measures time between tick and tock and deviation in tick-tocks' length etc, and tells if the watch gains or looses time.
From the measured data you can figure out what to set or modify to get more...
Dear All,
I would like to build this preamp which is from a Weishi Timegrapher, see attached pics.
I managed to figure out the circuit, but since I have only the picture of it I stuck with the smd capacitor values.
Watches are under 10Hz so the aim is to amplify the vibrations from the piezo...
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