Trouble in Loop Land

[UltraHookedOnPhonix]

Very cool!

Now if I could only learn the multiplication tables...

[ayan]

Very cool!

Now if I could only learn the multiplication tables...

Same here, look at the caveat I added to my previous post. Ha ha!

Anyway, the discharge time is huge on the Dumbleator power supply because the 1st two caps are not totem poled. So in standby mode you have an equivalent 23.5uF (two 47s) discharging through their ERS only... and THAT time constant is huge.

Cheers,

Gil

[angelodp]

ok

[UltraHookedOnPhonix]

SOLVED!

Like both Funk and Gil said, tying all ground points to a common preamp ground instead of relying on the chassis for grounding works…consistently!

I simply isolated the jacks with shoulder washers and isolated the front panel with nylon screws. Then I tied all pot cases and grounds to signal ground and did the same for the jacks.

A word on using a choke… DO IT! It really lessened the slight hum that was previously there. If I were to build more loops in the future, they’d all have chokes.

Finally, I added some blue goop to strengthen the chassis. As a result, I can really hear the harmonic transients blooming into a mellifluous cascade of colors above 30KHz…

Thank's for the help!

Here’s a couple of pics:

[IMG593]http://i205.photobucket.com/albums/bb17 ... Clone1.jpg[/img]

[IMG665]http://i205.photobucket.com/albums/bb17 ... Clone2.jpg[/img]

[angelodp]

Can you explain the white toggle ( ground )? Where did you get the choke?

ange

[UltraHookedOnPhonix]

The 1-N-2 ground is disconnected. It's just there to look cool!

I bought the choke from:

http://store.triodestore.com/22707.html

[ic-racer]

Here’s a couple of pics:

Looks fantastic, good work, thanks for showing this.