bosone

ok... now the problem gets big wiht my sid... i have two cores both working, (MIOS 1.7 sid 1.6), a usable finished control surface (step B) with LCD, two sid modules and 7 sid chips.... (3 6580 / 4 8581) the interconnection test works perfectly on both sid modules. i cannot hear a note from no one of my sids, using either one the other sid pcb. what other tests can i do???? i have contacted a friend who has a working c64 computer, and i will use it to test my sids, just to be sure.

no, you either misunderstood or i asked the wrong question: these are the voltages that i read on SID socket when i load the SID MIOS application, not the interconnecting test! the interconn. test is good but the sid still won't play... i'm using mios 1.7, sid 1.6, hardware mods for mios 1.7 the core is working, i see the text on LCD and i'm able to use the control surface

didnt' remember this thanks! :-) then maybe if my sids are faulty there is something wrong in the output stage...

just for testing purpose, what happen if connect directly the output pin of the SID (the one that goes to the transisor/caps/R and then to the out jumper) to an amplifier? i have a presonus tube pre amplifier, which can accept mic/instrument level signal and has a very high gain. from some previous post, i understood that the output circuirty is to amplify the signal at a line level... is it correct? this would check if my "no sound" problem is in the output stage of the PCB or in the SID itself... thanks

now that the interconnection test works, but none of my sid seem to work, i wonder if these voltage i read between GND and SID socket are correct: pin   V 1    0 2    0 3    0 4    0 5    5 6    0 7    0 8    5 9    0 10    0 11    0 12    5 13    5 14    GND 15    5 16    5 17    5 18    5 19    5 20    0 21    0 22    0 23    0 24    0 25    5    26    0 27    0 28    12 (using 6581, mios 1.7 and sid 1.6) core is working correctly the problem is that when i power up, all i hear are electric transients. i also tried with sidplayer, but no note are heard... just very small volume clicks and blips... beside this the sid was gettin really really HOT by the way, could the transistor on the audio output of sid be fused?? is the only thing that's lets (apart the fault of all my sids)

This topic has been moved to [link=http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=troubleshooting;action=display;num=1101042452;start=0]Testing/Troubleshooting[/link] by Thorsten Klose.

i know thorsten enjoy very much also receiving some CD of music played and produced by MIOS users! ;-) it would be a nice present from us to him! (also because christmas is approaching!)

http://www.ucapps.de/mios/mbsid_interconnection_test_b.zip its not new...

i'm trying to give life to my SID (which for now is difficult!) i still have to mount the LCD (which could simplificate a bit). the core is working (ping OK, etc) voltages seems ok (apart the fact that i read 5V on pin 5 (res#) of SID which is connected to pin 2 (O5) of the shift register (and also here read 5V). (without any IC put in the socket). my doubt is that on the schematic the R1 (10K) is connected to ground, while in the PCB it is connected to the 5V.... but this PCB worked time ago, so i suppose it's correct. if i mount the sid interconnection test application (on MIOS 1.7, did the hardware upgrade, and all the connections seems OK), i read 5V on all the SID pins, and i cannot control them with the modwhell (using MIDIOX). ideas?? PS: the SID is not working (i dont hear the dropping tune at the startup)

i'm working on my 2xsid+1xcore. i decided to build a "power supply module" which has the rectifier, several regulators (05/09/12V), and the two caps after the rectifier. since on every PCB (sid/core) there are the big elcap (10uF) and the small cap (100 nF), i was wonder if, on the power supply modure, i have to mount also another 2 caps (10uF+100nF) on each power output, before the connection that will bring the power to each module. since i have at home a lot bigger el.cap. (so it came the first question about the elcap.on power supply) but no small caps, i was wonder if it could be safe to remove the small ones from the power supply (here it came the second question, maybe i should have adressed the subject more clearly from the beginning...), since they are also on the pcb...

this one is very basical... from the lessons i took at university (a lot of years ago!), i remember that putting two caps in parallel is equal to having only one cap with a capacity that is the sum of the two. so: why do you put two caps before and after the 78L05/09/12 regulator? a 10uF one (el.cap) and a smaller 100nF = 10.1 uF. is the 0.1 uF absolutely necessary? since it can be used also an el.cap. with a value higher that the one stated (10uF), if i mount a 22uF or more el.cap, why not to remove the smaller 100nF one?

i would ask if, on the classic midibox power supply scheme, i can replace the el. capacitor (10uF one) after the regulator (7805/09/12) with one with more farad... i have a lot of el caps rated 22uF, 39, even 100uF, all with voltage rating > 16V. thanks!

i think that the "paint" you see is a thermoconductive paste, it's normal

i read in the changelog of sid (in the 1.6 alpha version): experimental AOUT support (7 CV out assigned to the existing outputs of the modulation matrix, 1 channel to the filter resonance parameter). For the final version it's planned to integrate the AOUT into a seperate modulation matrix, and to add new CC's to a seperate AOUT channel in the 1.6 final, is the aout finally supported? how does it work in detail?

i look at the matter, and decide to use a 79L15, to produce a -15V, coupled with a 78L15 which drives +15. both are connected to the same power supply i think i will use this for building an korg ms20 filter clone

is it possible in the seq to use the 4 track layers in such a way that they will play one after the other, in order to create a sequence that plays on only one track a total of 64 steps? is a feature like this planned?

while thorsten is working on the new FM synth, i was thinking about studing part of the SEQ MIOS code to be able to add a randomization function to the velocity track. My aim would be this one: to add a random value (fixed between a maximum and a minum, lets' say +15 / -15, however fixed in the code somwhere) to all the velocity tracks while they are playing, either in pattern mode or in song mode. the only limit is that velocity should not go over 127 or below zero. would this be a very difficult task? is there someone who has a basic knowledge of MIOS who can help me (ex. where to find the vel values, how to generate a random number, add it to the velocity value..) or, even better ^_^, provide this customisation?

you can take also a look into ebay community

i was looking thorsten schematic regarding the C64 power supply for the SID. he speaks about ground loops and of some tricks to lower the noise at 50/60 Hz. where can i found some info rgarding this topic? i plan to build my own power supply unit, because i will also need +15/-15V for an analog filter. since in the C64 case (see my other topic!) which will i use there is not enough space to insert the power supply module, i will make an external one, using a cable to drive the +15,-15,+12 (or +9),+5V alltogether. every voltage will have his ground wire. is there some drawback on this configuration? (i will mount caps on SID and core module, the ones after the 7805/12 regulators) another though: the C64 case i will use is made of plastic, not metal: will this bring problem with regards to the eletric insulation against interferences and/or noise in audio signal??

in searching for a case for my upcoming new double synth + analog CV filter, i decided to reuse the c64 one... the space is very limited inside, i think that there will be the space for 2 core, 2 sid, 1 CV module, 1 DIN and only one ms20 analog filter (not the two i thought to build...) i will build the "step B" control surface, with just an encoder and some pushbutton. the idea: i will re-use gour of the original C64 pushbutton (the F1-F8 ones, you will see in the figure). since the original c64 buttons are just "actuators" and not closing buttons themselves, i will mount a tiny button, the one that you could find in the PC mouse. i just tested that, if you make two small hole in the PCB under the C64 keyboard and then insert these buttons, the system will work! :-) a nice addition to the C64 "feeling"! the work will however take me a lot of time, and i don't know when my sid unit will come to life!

the powerfulness of the ms20 is that you can use them in series... i thought to do the same.... however, in the schematic that i found, changing from HP to LP is a simple matter of changing the pinning of a capacitor... so it could be a good idea to implement

i found a PCB and schematic for a korg ms20 filter (both highpass and lowpass). i have  korg ms20 at home at i think it's quite good... and also the highpass filter can add a tremendous power in the low range once you increase resonance! the only problem is that i don't want to build 4 filters (2HP, 2LP)... so i think i will be summing the 2 sids (yeah, finally i decided to build only 2, wiht 6581) with an opamp (with gain) and send the signal directly to the filter. but i will also leave the option to use the 2 sids in stereo thru a bypass of the opamp and, moreover, let the filter to be used also with an external signal (so to be used also as a standalone FX unit), with another series of bypass.... what do you think about this design?

great! i just found at home an old soundblaster with the ymf262 chip! :-) ready to go!!

great, something to do after the sid... :-) a list of the needed material would be great, so that i can begin the search!!! :-) thorsten, you are great!

knowing what behringer did in the past... are we REALLY sure that inside the behringer midi controls there is not a PIC 18f452? ;D