Hello everyone,
I have been using my AIYIMA A07 for some weeks now, no complains about the audio quality, however I was annoyed by the volume knob, as it is difficult to control the volume on low volumes. I figured out that the potentiometer they use is linear, which explains my frustration.
I found this video in youtube from a guy changing the potentiometer. Youtube link
I had ordered (mouser.com) the potential meter he used, as well as 2 different units which had the same resistance (50K) and Logarithmic scaling:
RK09L12B0A31
Alps Alpine Potentiometers
RV122F-20-15F-A50K-0072
Taiwan Alpha Potentiometers
PTD902-2020K-A503
Bourns Potentiometers
To make the replacement as easy as possible have also created 2 different pcbs to use, as from factory the potentiometer is installed on a small separate pcb installed on some header pins.
I had ordered 2 from each type. I noticed directly that both the Alps Alpine Potentiometer didn't have the same resistance for the L and R channel, so one side was louder than the other.
Both the Bourns and Taiwan Alpha measured with in a couple of ohms between the L and R, the Taiwan Alpha is not aligning correct due the the height of the potentiometer. So I choose to use the Bourns, which I now have in use and are very happy with. It is a lot easier controlling the volume precisely, especially on lower volumes. I had to order a new knob, and make the hole in the front of the receiver a bit bigger for the new potentiometer to fit.
If anyone is interested here are the pcb designs:
https://easyeda.com/mschinkelshoek/aiyima-a07-volume-knob-pcb (the one i am using)
https://easyeda.com/mschinkelshoek/aiyima-a07-volume-knob-pcb_copy (incase someone really wants to use the Taiwan Alpha potentiometer, however it will not align correctly due to the height of the potentiometer)
You will need a new knob, as these three potentiometers are with a D shaft. I used the once mentioned in the youtube video link. here
This forum has been a lot of fun and helpful for me, so I am happy to give a way the pcbs, and the potential meters that I have laying here. I had ordered 5 of both pcbs, and i have now 9 knobs 1 Bourns , 2x Taiwan Alpha Potentiometers, 2x Alps Alpine Potentiometers left.
I will not be needing them. So if anyone is interested in doing this, send me a PM, I will send you the pcb, knob and potentiometers for free. Use at your own risk.
I have been using my AIYIMA A07 for some weeks now, no complains about the audio quality, however I was annoyed by the volume knob, as it is difficult to control the volume on low volumes. I figured out that the potentiometer they use is linear, which explains my frustration.
I found this video in youtube from a guy changing the potentiometer. Youtube link
I had ordered (mouser.com) the potential meter he used, as well as 2 different units which had the same resistance (50K) and Logarithmic scaling:
RK09L12B0A31
Alps Alpine Potentiometers
RV122F-20-15F-A50K-0072
Taiwan Alpha Potentiometers
PTD902-2020K-A503
Bourns Potentiometers
To make the replacement as easy as possible have also created 2 different pcbs to use, as from factory the potentiometer is installed on a small separate pcb installed on some header pins.
I had ordered 2 from each type. I noticed directly that both the Alps Alpine Potentiometer didn't have the same resistance for the L and R channel, so one side was louder than the other.
Both the Bourns and Taiwan Alpha measured with in a couple of ohms between the L and R, the Taiwan Alpha is not aligning correct due the the height of the potentiometer. So I choose to use the Bourns, which I now have in use and are very happy with. It is a lot easier controlling the volume precisely, especially on lower volumes. I had to order a new knob, and make the hole in the front of the receiver a bit bigger for the new potentiometer to fit.
If anyone is interested here are the pcb designs:
https://easyeda.com/mschinkelshoek/aiyima-a07-volume-knob-pcb (the one i am using)
https://easyeda.com/mschinkelshoek/aiyima-a07-volume-knob-pcb_copy (incase someone really wants to use the Taiwan Alpha potentiometer, however it will not align correctly due to the height of the potentiometer)
You will need a new knob, as these three potentiometers are with a D shaft. I used the once mentioned in the youtube video link. here
This forum has been a lot of fun and helpful for me, so I am happy to give a way the pcbs, and the potential meters that I have laying here. I had ordered 5 of both pcbs, and i have now 9 knobs 1 Bourns , 2x Taiwan Alpha Potentiometers, 2x Alps Alpine Potentiometers left.
I will not be needing them. So if anyone is interested in doing this, send me a PM, I will send you the pcb, knob and potentiometers for free. Use at your own risk.
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