Hi
I have good switched supply DC 12V, 2A with tolerable filtering, I think. (RIPPLE & NOISE 120mVp-p)
What I must keep on MF module board from capacitors and others filterning things?
I want save place on my MF board and some parts are useless.
X1 : B40C1500 - not stuffed
C1 : 2200uF - not stuffed? (maybe lower value)
C2 : 100nF - not stuffed?
D33, IC4, R1, P1, C3, C4 - I must keep for exactly setting 8V for MF
Thanks for your answers
B.R. LX
In other threads I’ve seen the gurus write that “Switching (power supply) is no good”…
In other threads I’ve seen the gurus write that “Switching (power supply) is no good”…
Sometimes, and mostly for Audio-circuits, because of humm ! Look here, I use a PC-PSU from an very old 386/486-PC for my LC (the MF-Board isnt shown on the pic)…
works great, test it if it brings you instantly the right voltage after poweron 
Regards
In other threads I’ve seen the gurus write that “Switching (power supply) is no good”…
Did I mention that I’ve also seen gurus write that they use them successfully? ;D
Hehe ;D
Did I mention that I’ve also seen gurus write that they use them successfully? ;D
I think confucius once said:
Switching PSU only good when expensive or not for audio.
Yes I think that switching power supply is ok for my (only midi 
) controller.
But I need remove some parts from TKs FM module and I dont know which? :-\
You can replace the 2200µF cap with a smaller one (I *think* 1000µF will be okay, there’s a value given on one of the SID schems on ucapps.de), you can leave out the bridge rectifier. That’s about it. The rest appears to be what’s in the LM317 datasheet and should most likely not be replaced.
Tkanks! that is what I need hear
I replaced R1 (240) by a 150 Ohm, because I didnt reached the 8V with P1. Also dont forget mounting a heatsink to the LM317, or the voltage will drop down after a little time when some faders moving.
These are valuable information for me. Thanx a lot! Which size of heatshink?
about 2-4 cm2 ?
perfect thanks