Yamaha Sound Chip, Line Level Output, Version 1 ~ V4 (Not for V5) ButtonPuncher's Notes:
I have use this a Few Times. Follow Link For GREAT M$WORD Document with Color Photo !
Did You Use Electrolytic Caps ???
I-Opener Areas / I-Opener Technical Stuff
RE:HEY Roastbeef!! Help me out! Great audio out... ButtonPuncher
Well, I'm back from testing and...
I tried a 100uF capacitor and I found that it blocks the DC bias and has an excellent frequency response from
20Hz to 20kHz. On the bad side, I found out that the Yamaha chip has to have a buffer placed on the output.
If you connect the Yamaha to your stereo through a capacitor directly, THE AUDIO WILL BE VERY BAD. This is
because your stereo will place too large of a load on the Yamaha chip.
To fix this you need to wire up an Op-amp from radio shack. The part only costs a two bucks and is VERY
easy to wire up.
For all of the details on my testing and for the wiring diagram please download the Word document from the
This should give you CD quality audio out of the i-Opener. Oh yeah, the zip file is about 200k and all of the
readings were taken with my Fluke 89 IV multimeter. (the peak to peak readings were calculated)
Once I borrow a scope from work for the weekend, I will post any new findings and results.
Also, please tell me if the word document works out for you.
If you need to contact me directly, my e-mail address is firstname.lastname@example.org
05-31-2000 10:20:44 P.M.