Hook up Hiss

[add-dis]

Hi

I am new to stomp box building..... I have so far built a SHO, Meathead, and LPB1 Clone..I got the lay outs from here

http://tagboardeffects.blogspot.co.uk/2010/02/zvex-super-hard-on.html#comment-form

All work great off battery snap.

Yet I get hiss when hooked up to the DC Socket.

The story so far..

This is what is happening..

I first built the circuit and fired it up no bypass on a battery snap...Worked great

Then I went to wire up the bypass and place it in enclosure without battery snap, on a plastic dc 2.1mm socket so could use my power supply. Then hissing . The pedal still works great, just a hiss. Yet if I turn the pedal up without playing the hiss gets quite turn the pedal down the hiss gets louder...

If I now remove power supply and clip battery snap onto dc socket the pedal fires up no hiss.

I used this wiring diagram for hook up...

http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/

Here are some pics...

http://s1060.photobucket.com/albums/t456/jamesd741/

Wire color codes..

Orange... Ground
Black... Power In
Purple... In-Out From switch
Pink... Circuit in
Yellow... Circuit out.
White... To number pot..

I have since taken my meathead clone off of battery snap and used a different hook up diagram and the same hiss. 

I have changed transistors and the same....

Any help please....

I got all the parts from DR Tweek...except The DC sockets these came off ebay

[bangerang101]

It could be a number of things but heres the first thing that comes to mind...

On the paticular layout you used for the SHO, theres no power filtering in place on the board so try putting a 47 - 100uf electrolytic capacitor between 9v and ground to smooth out power ripple... To do this, solder the negative lead of the capacitor to the ground lug on the dc jack, and wire the positive lead of the capacitor to the power (9v) lug of the dc jack. See if this doesn't cure the problem.

[add-dis]

Thanks

I only have 10uf electrolictic will they do....

[add-dis]

I found a 100 uf electro fitted and still hiss

Any more ideas...

I am at a total loss..

I have also tried a different power supply and no change...

[add-dis]

Hi Guys

As per problem mentioned above could his be that I am not grounding the power ground on a sterio socket sleeve?

[SISKO]

Hiss or hum?
Is your PS well filtered and regulated? Does it make noise with other pedals?

[Colonel Angus]

It's hard to say if your problem is the chassis grounded jack. Good thing though, it should be easy to figure out. Probably worth it to at least try and connect the ground lug to the power ground, should only take a sec and either your problem will be solved or you can scratch one more thing off the list.

[add-dis]

 Hi

Thanks for the advice...

I have had the power supply for about a year.. It is fine with my other pedals... It  is defiantly a hiss.

I have also tried a different wiring diagram and its still there :icon_redface:This has a ground running from both input and output.

I was looking at a hook up diagram on here and it has stereo input socket with the power supply grounded to the slave..   I have used to mono.

[add-dis]

It could be a number of things but heres the first thing that comes to mind...

On the paticular layout you used for the SHO, theres no power filtering in place on the board so try putting a 47 - 100uf electrolytic capacitor between 9v and ground to smooth out power ripple... To do this, solder the negative lead of the capacitor to the ground lug on the dc jack, and wire the positive lead of the capacitor to the power (9v) lug of the dc jack. See if this doesn't cure the problem.

You are right HISS GONE..It took a 330 uf cap to do it...