Hello everyone. This is my first post here, but it is not going to be last one for sure
I am trying to build astable output circuit with NE555. It should be simple and no problem circuit application. I read manual and selected resistors and capacitors for 600hz output operation. C1=0.33uF R1=1kOhm R2=3k0hm(pot and i can adjust it).
I used Eagle to and this is circuit(pic1) and basic layout(Pic2) i am using.
This is only one part of final pcb, but for testing i soldered only elements needed for timer to work (ne555, 3 resistors and 3 capacitors). (pic3)
When connected to 5v power supply and Oscilloscope connected between Pin3(out) and Pin1(gnd) i get nice 600hz +-10% signal (pict4). Problem starts after 10-20s when all i get is 5v without switching off. (pict5)
When power supply is disconnected back pwm signal is back for next 10-20s and after few sec its only 5v.
I tried different resistor values, and i tried different NE555 ic. but result is still the same. I am using multilayer unipolar (Non-polarised) capacitors.
I have no idea how to solve this problem. So any help is welcome and i am sure there is someone who knows what mistake i have done and how to fix it.
I am trying to build astable output circuit with NE555. It should be simple and no problem circuit application. I read manual and selected resistors and capacitors for 600hz output operation. C1=0.33uF R1=1kOhm R2=3k0hm(pot and i can adjust it).
I used Eagle to and this is circuit(pic1) and basic layout(Pic2) i am using.
This is only one part of final pcb, but for testing i soldered only elements needed for timer to work (ne555, 3 resistors and 3 capacitors). (pic3)
When connected to 5v power supply and Oscilloscope connected between Pin3(out) and Pin1(gnd) i get nice 600hz +-10% signal (pict4). Problem starts after 10-20s when all i get is 5v without switching off. (pict5)
When power supply is disconnected back pwm signal is back for next 10-20s and after few sec its only 5v.
I tried different resistor values, and i tried different NE555 ic. but result is still the same. I am using multilayer unipolar (Non-polarised) capacitors.
I have no idea how to solve this problem. So any help is welcome and i am sure there is someone who knows what mistake i have done and how to fix it.