voltage drop crash

[sensor]

hi,

i tried a voltage drop crash on my sk-100. with low batteries it works really fine. so i soldered a pot(1k) between the plus of the power supply and the board and it just don't works, even at voltages it should work. where is the problem?

thanks,
matthias

[nochtanseenspecht]

strange.. 1K should do it. did you connect it right ? maybe in series with a trimmer..

[sensor]

yes i think i connected it right. perhaps it's about the power supply. has anybody experiences with doing the drop crash with to a power supply. maybe i should try it with an capacitor after the pot. but what kind of capacitor? and with an resistance parallel to the capacitor? i just don't know.

matthias

[zephler]

I don't think the voltage crash works when the unit is plugged into the wall , perahps the fact that it has 120V available, the voltage crash doesn't work - but I am not sure...anyone?

[noystoise]

ehh yeah.. i didnt like the idea of shorting batteries but a transformer? i dont know guys, i think you should consider using a vco to under-clock your machine. it might be a lot more reliable in the long run.

[Gordonjcp]

Don't short out the power supply, whether it's batteries *or* a mains power supply.

You need to get or make some sort of adjustable power supply.  Go and find a circuit for a variable voltage regulator, and build that.  You can just make the regulator stage and run it off an unregulated wall-wart.  Something like this should do the job:

http://diyaudioprojects.com/Technical/Voltage-Regulator/

Gordon MM0YEQ