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With a 5V supply the datasheet of an ordinary shows that its output goes as high as only 3. For a better experience, please enable JavaScript in your browser before proceeding. Potentiometer Questions Started by norbss Yesterday at At the time Catasheet didn’t have the manual switch installed. Is a little 9V battery able to produce enough power to drive the motor?

Wooops, I think I need to move the manual switch diode out ahead of the pin 3 diode. I’m not an electro-tech guy but a mechanical engineer, way over my head. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Consider some small 0. You must log in or register to reply here. Your schematic does not show a part number for your Mosfet.

Thanks Aardy, I’m kind of a newbie at this. I will give this a shot. Perhaps a bipolar transistor would be better? By that I do not mean that Jacbk will be one of them. I tried doing the same thing with mine to see if it was helpful in regards to the effect of the manual switch but it was not.


Irrz30 yes, we need to know the spec of the pump motor Nowhere says the size of the 9V battery. I certainly will not, I appreciate all the help I can get. Irfa30 for the schematic. Click here to register now. Just saying hello Started by MichaelaJoy Yesterday at 6: By continuing to use this site, you are consenting to our use of cookies.

Jacques, Instead of a relatively high current switch to operate the pump motor, why not just provide a low-current with series resistor input to the MOSFET?

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Maybe the little 9V battery “falls on its face” when the high starting current of the motor causes datashee voltage to drop which causes a false trigger of the ? Now when I use the manual switch it sets off the timer.

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Boncuk shows a schematic that isolates the trigger pin 2 of the timer with a transistor. Both the schematics in the 1st post of this thread show a 9v battery, but I will wait until jacbk replies – at least we are not wasting our time. Keep it simple and cheaper! The following posts were split off from the following old thread: There are a few differences compared to the one I have tried and shown above.


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I had false triggering on my timer setup then I added a microF cap. I think even 10K’s would work, someone out there dafasheet know. Media New media New comments Search media. In fact, always check datasheets On the LM you have a capacitor which is datassheet in parallel with the ohm resistor from the output to the ADJ pin but the datasheet has only the resistor or the resistor with an added parallel diode when the ADJ pin has a capacitor to ground.

I’ve read so many threads where the original OP is OP right? Last edited by a moderator: Way too low for most Mosfet gates. OP is commonly used around here in the forum. Somewhere it says the motor is a 6V motor so maybe 9V is too much for it. I am using a ohm resistor ahead of the diodes because that is datasheeg I have.

Welcome to our site! I can tell by the sound of the pump, and allot less flow is being produced. To be honest, the LM isn’t really needed, it could be run directly off the battery. Thread starter jacbk Start date Mar 6,