What do you use for power supply filtering?

[spargo]

I'm curious what everyone uses for power supply filtering and why.  I don't use batteries on any of my effects.  I'll typically just connect from +9v to GND a 1N4001, 47uF cap, and .1uF cap.

Also if anyone has links to articles that talk more about the tech behind this, that'd be great!

[vendettav]

hmm im also interested.

i actually do the 100uF electro from the + to ground

[deadastronaut]

hmm im also interested.

i actually do the 100uF electro from the + to ground

same here.... its always on my breadboard.....i dont use batteries either..

[vendettav]

hmm im also interested.

i actually do the 100uF electro from the + to ground

same here.... its always on my breadboard.....i dont use batteries either..

yeah no batteries for me either

[Hides-His-Eyes]

For analogue effects just 220u from +ve to gnd after a 5817 schottky for ACTUAL polarity protection instead of "suicide" polarity protection

for digital, that plus decoupling on the IC, both sides of the 5817, 100n both sides of the regulator, and a seperate cap for the relay if I'm using those

[petemoore]

  Add power line length to decrease PS noise injection.
   Ie for LFO or other 'gulper' circuit, putting the last filter cap right at the 'current gulpin' active circuit V input pin [at the chip/very close] reduces the voltage difference between the DC smoothing cap and circuit V+.

[amptramp]

I am currently working on a design that uses ±12 VDC supplies from a wall wart and uses series diode protection before going into +5 VDC and -5 VDC regulators.  I have resistors in series with the diodes and capacitors connected from these resistors to ground.  The reason for adding resistors is that if there is no resistance, the pulse currents through the rectifier diodes will be shared in the ratio of the wall wart internal capacitance and the effect capacitance and I want to minimize pulse currents going down the power line.  Using dual supplies means that a minimum of current goes through the ground lead and op amps generally perform better with dual supplies.  Keeping the ground separate from the power supply helps keep power supply glitches and noise out of the signal.

Batteries are a throwback to the days of "wow, look at that, you can change the sound of my guitar with this box ot tricks" rather than optimized design.  The use of ±5 VDC internally allows the use of CMOS including analog switches and most of the early bucket-brigade delay devices.  The single-ended 5 VDC can be used for logic and digital delay devices.  It makes no sense to have a device that uses up an appreciable (or unpredictable) amount of current and take it on tour.  And of course, there is no mistaking my adapter plug for anyone else's.