Hi guys
I have a guitar tuner which I bought in 1995 I think. I like it a lot, since it has a nice analog VU meter :-)
Some years ago stopped working properly and I was told that the problem was the main IC (microcontroller of some kind).
It is powered by a 9V battery, but the auto led which should be solid red, kit is blinking red at the rate of 1Hz maybe. It is like the system is constantly rebooting.
From one of the images, you can see a voltage regulator (78L05) and 2 devices with the reference N44 122.
A guy told me that these should be 82N44 voltage detectors, but I don't know.
I've checked the output voltage of the regulator and it is 4.9V when I apply 12V in the input, but for 9V is only 4.2V. However 4.2V should be good enough to most micrcontrollers.
Questions:
1 - Do you have an idea how to approach this?
2 - If the problem is the uC, how can I discover a compatible part? I don't believe that Korg had these ICs made just for them.
By the end, if I cannot fix it, I will put an STM32 F4, which has DSP embedded and build a new tuner using the same enclosure.
Thanks in advance.
Best regards,
I have a guitar tuner which I bought in 1995 I think. I like it a lot, since it has a nice analog VU meter :-)
Some years ago stopped working properly and I was told that the problem was the main IC (microcontroller of some kind).
It is powered by a 9V battery, but the auto led which should be solid red, kit is blinking red at the rate of 1Hz maybe. It is like the system is constantly rebooting.
From one of the images, you can see a voltage regulator (78L05) and 2 devices with the reference N44 122.
A guy told me that these should be 82N44 voltage detectors, but I don't know.
I've checked the output voltage of the regulator and it is 4.9V when I apply 12V in the input, but for 9V is only 4.2V. However 4.2V should be good enough to most micrcontrollers.
Questions:
1 - Do you have an idea how to approach this?
2 - If the problem is the uC, how can I discover a compatible part? I don't believe that Korg had these ICs made just for them.
By the end, if I cannot fix it, I will put an STM32 F4, which has DSP embedded and build a new tuner using the same enclosure.
Thanks in advance.
Best regards,
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