I have replaced lots of parts on this board to try and get it working. It works for a few minutes then shuts off and does a led flash sequence that shows its not getting the correct voltage (10 flashes of the green led) I turn it on and it works fine, something has a slight hum which gers louder over time. The voltage regulator 78L05 gets hotter than anything else on the board (40C). Then the thing shuts off and won't work again for a while, just constantly does the led flash sequence. I'm guessing something is heating up and it shuts down for protection. I have changed the voltage regulator, all diodes, swapped the relays around, changed the op amp chip (LM258), zeners and even bought a new power supply incase it was my old one causing the problem.
I get a nice solid 12V output in P3-6 when using the remote, until it goes into protect mode or whatever it is with the flashing leds.
I made a simulation for the op amp, its in the pictures, the 2 outputs are going to 2 pins on the ATMega, not leds like in the picture.
I'm stuck, can anyone please help?
I get a nice solid 12V output in P3-6 when using the remote, until it goes into protect mode or whatever it is with the flashing leds.
I made a simulation for the op amp, its in the pictures, the 2 outputs are going to 2 pins on the ATMega, not leds like in the picture.
I'm stuck, can anyone please help?
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