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piezo switch
I'm building a flashlight for scuba diving. I ordered a piezo electronic switch of internet as it is very robust and has no moving parts.
The problem is that it's output when pushed is a short pulse (length varies with push force). The lamp should toggle between on and off when...
An bldc-motor (80 W) with electronic controller-board fitted in a car, on or beside the engine.
How would the design be affected by vibration? Is vibration a common problem for theese types of applications?
Re: About motor startup...
IanP:
I have already looked at that App. Note... It is written to avoid failure.
My motor diddn't even start up.
After trial and error I foud that the pin "brake" need a low pulse to get a flank that the "hall measure circuit" can react on.
The solution was a...
I want to split a net in two in Orcad Layout.... How to do?
The reason is: There is a MOSFET Bridge with high currents. There shall also be sensing components connected to the bridge.
My problem is that the small signal sensing components also gets routed with "fat" connections. So I want...
uc2625 application
I'm using UC2625 to drive a bldc motor. Works great with the typical application circuit in datasheet.
But you have to give it a nudge just to get it started... then it accellerate fast wich is great.
So how do I make it start automatic?
Added after 1 hours 24 minutes...
What is Bus clamp?
On page 5 in app. note there is an input on pin 23 (OV-COAST)
What does it mean "from Bus Clamp"
EDIT:
... and here's the link
App. Note: **broken link removed**
uc3625
I'm trying to construct a bldc motor controller using Texas UC3625 (same as 1625 and 2625). It has all the nice features I want so I tried to use the circuit in the datasheet.
But it does not work... the three high side MOSFET's seems to work but not the lower ones...
The MOSFET bridge...
Re: VGA to TV convertor
I've made a vga to rgb cable myself... well I copied the design from a swedish student who made a guide in swedish.
It is a simple solution with few components.. actually only one resistor, cable and connectors. You connect it to the second vga on ati card and to scart...
bootstrap mosfet
I use IR2136 MOSFET Gate driver to drive a bridge of 6 transistors... for BLDC motor drive.
How do I know the size of bootstrap capacitor that I should use?
Frequency: 20kHz
Feeding IR2136 with PWM-signal of 20kHz and Duty 20-90%...
How do I use the ITrip function on the IR2136?
I can se there is a resistor circuit that should messaure the current...
My Mosfet bridge (3-phase) needs to be connected to ground via 1 ohm sensing resistor (is used to for feedback through a comparator)...
so what is the purpose of the circuit connected between 0.1 ohm resistor and AND-Gate?
Is it simply that the controller only controlls motor while there are Vm present at correct voltage?
While my motor drives of 24 V and 5 A there will be an effect of 2.5 W over just the resistor.... Correct?
In the datasheet there are two resistors, 0.1 and 1.0 Ohm in series with powersupply.... why? What is their purpose.
Look at page 18.
https://pdf1.alldatasheet.com/datasheet-pdf/view/102119/TOSHIBA/TB9060FN.html
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