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If you have the noise from the power supply if you do not sleep at night and think how to get rid of noise in your amplifier, we suggest to assemble a small and very simple circuit (with pictures!) To remove the interference.

Filter circuit power set predstavleaya scheme does not quite apply to filters, but to help the primitive measures you can.

Step 1: Schematic Diagram

Input power is supplied to connector J1, directly from the output of our pedal power supply. Diode D1 - protects against reverse polarity. R2 - limits the current that flows to the LED D2. If the LED is not necessary - removing it and R2, too. Noise reduction is engaged in the capacitors C1 and C2, resistor R1.

Step 2: Location and Connection Elements

What can then be used:

- Any LED that you enjoy

- Resistors constant power of 0.25 watts or more

- 1N4001 diode, or anyone with a current of at least 1A

- Electrolytic capacitor C1, the supply voltage of 16-25 V, 100 uF

- Capacitor C2 47 nF (desirable film), 50 Volt

That's basically it. Putting it. Connect. The truth may not always help the situation is different and causes of interference as well.

I try it, with my SLA 12v7aH battery. This module make a voltage is down when it connected with some MP3 player with amplifier. And the resistor have a high temperature condition. It's normal?
<p>i modified it ..... thanks for your easy schematic Cubozoa.<br>this will reduce high temperature of resistor ..... i use it for 12v SLA battery.</p>
<p>can I use a small ceramic for C2 or does it have to be film?</p>
<p>Yes, you can use ceramics. It will be better. even better - tantalum. But tantalum such containers like no.</p>
<p>Thanks Cubozoa</p>
<p>Is there a current limit on this circuit?</p>
<p>Hey. No. But you can add a field effect transistor.</p>
I miss BeavisAudio!! I remember this was one of my first pedal projects, great for reducing hum noises from bad power supplies
Nicely done. I modeled it in EveryCircuit on my way to work. <br>http://everycircuit.com/circuit/5198188983091200
<p>Well done, well turned out at you.</p>

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