Reductor De Zumbido En Transfomadores De Voltaje

Beavis Audio Research

http://www.beavisaudio.com/projects/Huminator/index.htm

The Huminator
Do you have a hum or other noise in your pedal(s)? A very likely cause is noise coming through yourAC adaptors. Many cheap adaptors lack even basic power supply filtering, so any noise in your AC mains ends up coming through to your pedal.But don’t despair. Here’s a useful and simple project: builda box that will eliminate hum in your pedal caused by crappy cheap power supplies. And all the parts are easy to find at your local Radio Shack.

The Schematic
Power enters through J1. D1 is adiode the protects against reverse-polarity, i.e. hooking up the wrong polarity adaptor. R2 limits the current the LED which expects 3 volts and would quickly burn out if directly connected to the 9 voltsource. R1, C1 and C2 form the filter that reduces hum.

The Parts List

Parts Substitution
If you can’t find the exact parts listed above, you can substitute the following values/types: LED:any kind of visible LED 3.3K ohm 1/2W 5% Carbon Film Resistor: any resistor of ½ watt or higher, values anywhere from 1k to 4k ohms. 100 ohm 1/2W 5% Carbon Film Resistor: any 100 ohm resistor of ½ wattor higher. 1N4001 Micro 1A diode: Could use just about any 1N400X value 0.047 F 50V 10% PC-Mount Capacitor: any 0.047 F film cap rated for 18 volts or more

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20/09/2011 18:03

BeavisAudio Research

http://www.beavisaudio.com/projects/Huminator/index.htm

Let's Wire it up!
I’ve arranged the wiring so it closely matches the schematic. That way it is easier to translate theschematic into actual wiring. The orange lines indicate the positive voltage and the yellow lines indicate the negative voltage, also known as ground. You can do the wiring by soldering components directlyto wires, or use a small bit of perfboard/circuit board. To ensure this thing actually works for you, be sure to check the connections on the DC power jacks before you solder them. Remember that the...