TURBO-R poor audio quality ...Why????

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By robivy

Supporter (8)

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25-01-2015, 06:39

Thanks! Check out my overall review of the Turbo R

https://www.youtube.com/watch?v=CE-XoXHaoVY

By Colemu

Champion (473)

Colemu's picture

10-01-2017, 22:12

very interesting thread,

I always wondered why the FM sound on my Turbo R ST was 'muffled' compared to the audio from my old Sony + FM Pak. Earlier in the thread sd_snatcher mentioned that this was due to incorrect capacitor values in the low pass filter. Has anyone with access to a schematic ever figured out which capacitors to change to either correct, or improve the issue??

Seems a shame that such a wonderful computer is let down by this small design fault... Sad

BTW: nice video robivy

By hamlet

Champion (357)

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12-01-2017, 02:54

I like your videos! Thank you, man!

By Colemu

Champion (473)

Colemu's picture

29-01-2017, 14:13

After trying different solutions with varying results, here's what I found to be the best (easiest) solution to the FM 'soft/flat' sound.

Replace R23 with 27k resistor (to increase volume of FM sound)
Replace C159 with 150pF capacitor (to increase the frequency of the FM sound)

Optional: Replace both NP capacitors C40 & C19 with 1uF tantalum capacitors (it seems to cut down some of the high frequency background noise)

Thats it Wink

Try it, you won't look back. The difference is like night and day Running Naked in a Field of Flowers

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