Oops... I was being way too vague; sorry about that, guys!
(...first post, you can imagine)
I need to power-up a circuit (Roland GK-3 guitar-synth hex preamps, nestled inside a guitar) fed by the bipolar power-supply (thus the +/- 7 volts) of the "synth" device itself (a Roland VG-99)...
Only, the plugging (and unplugging for say, swapping guitars) of the multi-conductor cable connecting the two causes a KraSh/Pop/bAng! in the audio. Thats why this little circuit "seemed" adequate for ramping-up & down the (+7 V) positive voltage...
If so, how would I go about "soft-starting" the negative (-7 V) side, using the same principle ?
Thanks sooo much for reading on,
(mucho appreciated !)
Joël
P.S.: I intend to build a switch-box selecting 1-of-3 guitar inputs, so: a selected GK preamp circuit would be "soft-started" before the next one is "soft-powered-down"... hopefully: noiselessly ! Am I making any sense, here ? ;¬ ) -"Ah, musicians !"...
EDIT: hey, thanks there, Chris (yes, you got it right)! and thanks to you too, Ron (love the avatar! Is that you ?) for the original neat little circuit; I'll give it a go, first thing tomorrow with a (matched turn-on characteristics) P & NFET pair... oh: and let's not forget wuchy, I mean mike! for the original post... thanks guys! G'night...