moebius

Hi, This might clear thing up: (From:http://www.ucapps.de/mbhp_sid.html) SID output is not meant to be loaded. Bye, Moebius

Hi, To save you from further confusion, just wire it exactly like: http://www.ucapps.de/mbhp/mbhp_lcd.pdf (can be found from MBHP LCD module page) BYe, Moebius (LCD pin1 GND, marked as VS on core side, LCD pin3 V5, marked as V0 on core side. And LCD anode is B+ and cathode is B-)

As in an example schematics on MIDIO128 page - the one you've already read - yes ;) Bye, Moebius

Watch out, or you will be disqualified as a Circuit Bender for doing only useful and workin' mods ;) A Bit of programming challenge there. Basicly the thing is to use matrix scanning "outputs" from HT (connected to DIN) to let MIOS/App to see which part of matrix is being scanned, and use DOUT to fake switch positions (short/open = 1/0) (connected to HTs matrix inputs) of that particular part of the matrix. And so on.. I have understood that during DOUT update voltages on are not steady.. I'm not sure if this affects much this?! Bye, Moebius ps. Where are the sound clips ;)

Great ;) Your excitement is a good sign - but don't let it be an obstacle for readin' documentation.. ;D Bye, Moebius

Sorry.. - No boards or kits offered - I haven't even seen a ready made pcb layout for that. Maybe someone working midification projects has done it. But the circuit is pretty simple, so it's easy top build on so called "veroboard" (board with holes in raster and copper strips) Bye, Moebius

Do you think it's still there, after ??

After burning bootstrap loader, that is?

Hi, Well, for interfacing DOUT with darlingtons, see MIDIO128 page: http://www.ucapps.de/midio128.html There's schematics example for connecting ULN2803 darlington array to DOUT. Bye, Moebius

You could also try burnin' bootstrap loader to pic as it's supposed, and uploadin' MIOS using midi?! Sorry, just a guess.. Bye ya, Moebius

Hi, If you don't have negative supply available, you can use something like Microchip TC7660 (many IC manufacturers offer similar devices, usually part number ends with 7660) charge pump to convert positive voltage to negative one. It needs minimal external parts, and is pretty cheap. Then you just connect contrast pot (trimmer) between new negative supply and gnd, and pot wiper goes to LCD pin3 (V0) Bye, Moebius

Yes yes. SID is the same.

Hi, SPLC780 controller is on my HD44780 compatible list ;) (http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=parts_q;action=display;num=1099842869) It's very likely that it works.. And it seems that your display needs that negative LCD.. Bye, Moebius

More like individual pots in place of 820R and 130K / 820R and 10K, or something.. "Lower dac" output looks pretty square (-ish) to me.. Mixin' Â is done in 1:158 ratio, so it's very small component of the sound. With individual controls, you could make new "buzzy" sounds, but probably loose the originals (if you don't make a bypass switch :).. (How do you dial accurately 1/158th or something from a pot? ;))) No midi control here, if you don't cook up some VCAs... Probably linearity of a digipot is much better than pot onboard.. But does that guarantee snappin'? Who knows ;) You can always hope.. BUT it's better to grap something (at least nearly) MIOS compatible ;) Bye, Moebius

Well, external input might need some signal conditioning and at least AC coupling (that cap before vcf input in the schematics). What are the levels going to vcf? Maybe just pot for adjusting level and straight non-inverting buffer.. Somehow I think that balanced outs are kind of unnecessary in this piece of equipment ;) But individual outs sounds good.. As I was looking for peak to peak voltage level for the vcf input - I happened to realize that sounds are generated by actually mixing 2 dac outputs.. Instant new waveforms ;) Just look at page 17 of the datasheet.. Bye, Moebius

GGrrreat Work! ;) As long as it works.. seems like uC doesn't give a phuk about it ;) Bye, Moebius

Hi, Actually there is a donation link in MIOS SourceForge.net project page. Lets hear from the man himself, but I guess that Thorsten sees that becoming an active forum member - keeping his support efforts in trivial stuff minimum and/or contributing in MIOS/Apps development as support for this incredible project. Bye, Moebius

Phil Spector (even after bad publicity)

That's correct. Well, do you remember equation for time constant in Cap circuits? The bigger cap is used as storage, that "slowly" charges and discharges as voltage changes, it keeps voltage pretty stable. Its "size" isn't that critical, as long as it's there. This is especially important after rectifier, which outputs pulsating DC. The smaller cap has significantly smaller time constant <-> it charges and discharges in much faster rate <- > it reacts faster on voltage changes <-> It takes care of the "ripple voltage" left in powerline after the bigger cap. ;) Omitting power supply bypass caps is not a smart or healthy thing to do ;) Bye, Moebius

::) Yeah.... The special offer has ended and encoders are available from the shop, so I thought it's better to avoid clutter and direct people to the source, where they end up anyway. Bye, Moebius p.s. "...and how much it was again that local shop wants for encoders with a switch.. 8.60 Euro.. " :o

That's what I meant. ;)

No problem ;) Bye, Moebius

Hi ya.. Just checkin' local "ebay clone" for Casios ;) Ok - You learned the upper limit of res CV, and that Casio design was lame ;) Don't insert cv before the buffer as it protects uC from extrenal voltages... I think you should replace (all Casio related) AOUT buffer resistor values with those on your working buffer.. it would give you the oppurtunity to scale those as fit.. Maybe there is more scale to freq controls as well? Bye, Moebius

Nice to hear, man! How much the voltage is then?! ;) And, maybe you could post some sound clips somewhere? Bye, Moebius

phaser