Hello

[dodger]

Hi

I have just started to learn about building Effects, sort of a solder by numbers type of guy lol.

I have know got a very basic understanding of a boost circuit.

My first build was a SHO, worked great built it on vero using a layout from what is a great site.

I started building because my mate bought a ZVex SHO and I wanted one after hearing it, but as a tight fisted Yorkshire man I am couldn't spend that sort of money without hart failure     .

Anyhow my mate with the original Zvex SHO heard that there was no sound difference between my clone and his original and pestered me to give him mine so he could sell his.
So I did for the cost of a an enclosure a couple of jacks and footswitch.

Now I built another one yesterday but this time on tag board as Maplins had no vero in.  The pedal works just as it should but there is a constant hiss when plugged into my power supply. I have done a bit of research and believe it is power ripple as there is no hiss on a battery.

I was just wondering if any of you good folk may be able to help with eliminating the issue..

[samhay]

Hi dodger - welcome to the forum.
Would be good to know what layout you used and/or which schematic you followed, but let's assume you don't have any power filtering. The symptoms fit, so this is is a good place to start.
You could build a little standalone circuit to do some basic power filtering - e.g. take a look here: http://beavisaudio.com/projects/Huminator/index.htm
Alternatively, if you have room left on the tagboard for a couple more components, then you want to add some/most of this circuit to the +9V input of your SHO - at a minimum, you need the 100R series resistor (R1) and a BFC* to ground (R2).

*big capacitor - size not too important, but usually 47-220u

[GibsonGM]

Welcome Dodger!  Yes, samhay has some good advice there!
I wanted to commend you on using tagboard with schematics.  There's nothing wrong with Vero, but in my humble opinion you don't learn as much as how you're doing it now, and it can also be hard to troubleshoot.    Just my 2 cents, keep on going!

[dodger]

Cheers for the link samhay....do I need the led? I am not sure if its there to let you now its on or as a part of a rectifier circuit or both.

I am finding tag board alot easier to work with and work out what's going on plus it looks great .... mojo filled lol

[dodger]

oh the layout came from http://tagboardeffects.blogspot.in/search/label/ZVex

cheers

[dodger]

Thanks SamHay built a huminator yesterday and the Hiss is gone.....

That site you directed me to is great full of really useful information.

Once again thanks for the link...

[samhay]

No worries - glad you got it fixed.

[Brisance]

Good idea is to add some stabilisation caps to any project's power supply.

Even my breadboard has a semi-permanent installation consisting of a 220u electrolytic and a 1u ceramic across the rails and a led+resistor combo(to see if the power is switched on)