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False triggering of a timer | Electronics Forum (Circuits, Projects and Microcontrollers)

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False triggering of a timer. Thread starter jacbk Start date Mar 6, The following posts were split off from the following old thread: I had false triggering on my timer setup then I added a microF cap. At the time I didn’t have the manual switch installed.

Now when I use the manual switch it sets off the timer. Boncuk shows a schematic that isolates the trigger pin 2 of the timer with datzsheet transistor.

I tried doing the same thing with mine to see if it was helpful in regards to the effect of the manual switch rifz30 it was not. Last edited by a moderator: 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? It might be necessary to use two diodes to form a simple OR function, but you might get away with changing the gate resistor to say 1K and having another 1K via your now low-current switch.


I think even 10K’s would work, someone out there would know. Thanks Aardy, I’m kind of a newbie at this. Is this what you mean? Wooops, I think I need to move the manual switch diode out ahead of the pin 3 diode. I can tell by the sound of the pump, and allot less flow is being produced.

I am using a ohm resistor ahead of the diodes because that is what I have. Consider some small 0. Irgz30 fact, always check datasheets Your schematic does not show a part number for your Mosfet. Your pump needs a much higher current. With a 5V supply the datasheet of an ordinary shows that its output goes as high as only 3.

Way too low for most Mosfet gates. On the LM you have a capacitor which is wrong 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.

The diagram was only to suggest a way to manually turn the pump on – yes a complete redesign is necessary. Perhaps a bipolar transistor would be better?

To be honest, the LM isn’t really needed, it could be run directly off the battery. Keep it simple and cheaper!

Somewhere it says the motor is a 6V motor so maybe 9V is too much for it. Nowhere says the size of the 9V battery. Is a little 9V battery able to produce enough power to drive the motor? Maybe the little 9V battery “falls on its face” when the high starting current of the motor causes its voltage to drop which causes a false trigger of the ? 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 irfz03 time.


I’ve read so many threads where the original OP is Dataheet right? And yes, we need to know the spec of the pump motor OP is commonly irfz330 around here in the forum. By that I do not mean that Jacbk will be one of them. I certainly will not, I appreciate all the help I can get.

False triggering of a 555 timer

I’m not an electro-tech guy but a mechanical engineer, way over my head. Thanks for the schematic.

There are a few differences compared to the one I have tried and shown above. I will give this a shot. You must log in or register to reply here. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Potentiometer Questions Started by norbss Yesterday at Started by fastline Yesterday at 8: Just saying hello Started by MichaelaJoy Yesterday at datasheeet This site uses cookies to help personalise content, tailor datashete experience and to keep you logged in if you register.

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