Better EC400

Analog BBD delay

Single MN3005 4096 stage BBD

In reality a simple stomp box design with added LED meters for input and output. As it turns out they are not that useful as I like the way EC400 compress when pushed hard. Which are tuned by ears, not eyes. Op-amp used here are the JRC4558D made famous in the guitar community by TS808 Tube Screamer.

My unit had at some time been modified to interface with consumer gear, maybe to fit a DJ setup. I removed these phono connectors and fixed ground loop using isolated jacks. Added a prototype PCB with two fuses, inserted on the secondary windings of the transformer to comply with local regulation for mains voltage.

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Hans    2019-03-07 12:26:47
Thanks for sharing massimiliano.

I had noise coming from ground loop on mine. Solved replacing in/out connectors with insulated type.
massimiliano    2019-03-07 10:29:16
hi dude
I have the same effect rebadged KARMA EC140
by the way, mine is extremely noisy (bad filtering ?)
do you have the same problem ?
thanks
massimiliano