edp WASP FILTER WARMUP

[Rene Schmitz]

At 19:07 26.10.98 +0100, you wrote:
>I build the filter too, and I found that it works and sounds really
>nice.
>But : the CMOS chip warms up quiet rapidly, the temperature goes
>to 70-80 degree Celsius. It works for hours without failure.
>I'm sure, I used all the components that should be used, and the wiring
>is OK too.
>
>Is that normal ? (I mean the warming up, not soldering a WASP-filter)
>
>J.S.

I noticed this too. I think the power consumption is larger than in the
ususal digital
application where there is almost no current thrugh the two internal
mosfets (only if there are transients). But here we drive both transistors
into on-mode.
Similar like in a class A compared to class B power stages. 
Lowering the powersupply helps. The circuit is intended for 5V!

Bye 
 Rene


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