Re: echoplex - hi freq overload

[Chuck Zwicky <chuck.zwicky@wavefront.com>]

Is there a schematic available for the EDP analog section?
Do the converters in the EDP use emphasis?
Is the clip LED driven from the analog signal, or the MSB?


At 05:08 PM 3/10/98 -0800, you wrote:
>Recently I started looping my Alesis HR-16 drums with the echoplex dp.
> Prior to that I had input mostly bass guitar, and electric guitar.  
>
>While looping high hats and cymbals, I noticed that I have to be very
>careful with the input level (keep input LED only green), or I get an
>unpleasant distortion.  Per the input LED I seem to be able to input a
>much larger signal for bass drums (or bass guitar and guitar) and
>snare  than the cymbals. 
>
>Further, it looks like the LED for input level, and the LED for
>Feedback level do not correspond very well with one another.  The
>input LED seems to register lower than the feedback LED.  That is to
>say, when starting a loop, if I set the input level so that the input
>LED shows only green, then the feedback LED will still go orange or
>red (with high freq signals).  This occurs before the loop has grown
>beyond the initial input.
>
>I have not done the R7 - 75k 5% 1/4w CF modifications to the clipping
>indication on input LED, nor any of the limiter circuit modifications
>(r20,r21, or the resistor tacked to bottom of PCBA ala Kim).  
>
>Would any of these mods help with my apparent high frequency overload
>sensitivity?  Any other suggestions to resolve this?
>
>bret   
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