I did some poking around just now, and I think I found a stereo mod for the MV1-C. I didn't test it in depth, so I was hoping someone would verify it for me, I don't have a lot of stuff set up right now.
It looks like the custom IC NEO-YSA2 still outputs stereo, its just that the board then combines it into a mono signal before feeding it into the amp. The signal coming from the YSA2 is a PWM signal which goes into a small 8 pin soic "9480F" which seems to accept a few Mhz clock, and do a simple DAC job. Then the outputs of the 9480F, pins 1 and 4, go into identical second order LPF networks, and then are summed and fed into the audio amp.
The filter networks are comprised of R93-96, C7, C8 for one channel, and R100-103, C11, C12 for the other channel. This network is on the underside of the board right by the white CN1 connector, which comes out of the right side of the board (when viewed from the top)
To do the mod, I propose this:
1) Cut the trace between R95 and R102
2) Buffer each half of the trace with an EF, and capacitively couple the output with say a 10uF cap.
I bet this will give stereo sound, would someone please test this? Otherwise I'll test it in a week or two when I have time.
PS: It looks like the audio sampling rate is 22kHz? So a max frequency output of 11kHz... sigh. Makes the stereo mod seem so worthless.
It looks like the custom IC NEO-YSA2 still outputs stereo, its just that the board then combines it into a mono signal before feeding it into the amp. The signal coming from the YSA2 is a PWM signal which goes into a small 8 pin soic "9480F" which seems to accept a few Mhz clock, and do a simple DAC job. Then the outputs of the 9480F, pins 1 and 4, go into identical second order LPF networks, and then are summed and fed into the audio amp.
The filter networks are comprised of R93-96, C7, C8 for one channel, and R100-103, C11, C12 for the other channel. This network is on the underside of the board right by the white CN1 connector, which comes out of the right side of the board (when viewed from the top)
To do the mod, I propose this:
1) Cut the trace between R95 and R102
2) Buffer each half of the trace with an EF, and capacitively couple the output with say a 10uF cap.
I bet this will give stereo sound, would someone please test this? Otherwise I'll test it in a week or two when I have time.
PS: It looks like the audio sampling rate is 22kHz? So a max frequency output of 11kHz... sigh. Makes the stereo mod seem so worthless.
