Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
have you connected the grounds together?
this is a common problem with using different power supplies..
without the grounds connected the signal comming from the pic has no reference, thus it will not work properly..
conclusion :: connect all grounds together.!!
Yoo... if i use different supply for different motor...... fro exmaple 9V fro motor 1 12V for motor... 5V for PIC... all supp,ly is separately..... i didn;t connect all the ground together...!!!!
cos i tried before when i cpnnect all togther with same suply... i pic burn. damage.. immediately...!!! sad..... :?
it seems the first circuit you posted is right. try putting simply an NTC thermistor in series with the motor load, see if your problems will go away...
it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
cause it happened to me once. driving an inductive buzzer load.
i changed 3 relays, no luck.
put capacitor as well as diode across relay, no luck.
isolated power supply, still no luck.
isolated with optocoupler, still no luck.
what i noticed with one of my relay(which has a transparent casing), there is a spark whenever relay activates, i figure out that inrush current is making my relay stop and pic to reset. i put a series NTC thermistor, since initially it exhibits high resistance which is ideal to stop inrush current, in series with my inductive load, and all problems gone, circuit worked flawlessly now.
thanks.... but i just using a capacitor to place across the motor...as shown figure above at point A and point B !!! the probelm also can solved..!!!! so which ways is the better one???? i just want to improve..... my circuit~~!! thanks... :twisted:
cause it happened to me once. driving an inductive buzzer load.
i changed 3 relays, no luck.
put capacitor as well as diode across relay, no luck.
isolated power supply, still no luck.
isolated with optocoupler, still no luck.
what i noticed with one of my relay(which has a transparent casing), there is a spark whenever relay activates, i figure out that inrush current is making my relay stop and pic to reset. i put a series NTC thermistor, since initially it exhibits high resistance which is ideal to stop inrush current, in series with my inductive load, and all problems gone, circuit worked flawlessly now.
hey.... erm.. i got one motor is needed 12volts..... then another is 3 to 5 volt...
at first turn on 12V.. relay no problem.... but when i using high torque one.. its a dc gear box..... relay problem happen~~~!!!! its only 3 to 5 voltages only.......!!!!!
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
