[sdiy] CA3130 problem solved! ->> S&H problem solved!

[Rutger Vlek]

Alright...i think you'll enjoy this. I allow you all to shout the words:

"STUPID PIG!"

at me once...

I mistakenly recalculated 0.2uF to 200pF instead of 200nF!!!

Hehehe.ooops ;)


Rutger

>From: René Schmitz <uzs159 at uni-bonn.de>
>To: "JH." <jhaible at debitel.net>
>CC: HA.Synth at t-online.de, Rutger Vlek <rutgervlek at hotmail.com>,        
>James Patchell <patchell at cox.net>, synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] CA3130 in Polyfusion Noise module...should a new  one 
>work?
>Date: Thu, 22 Dec 2005 00:02:11 +0100
>
>Hello Jürgen and all,
>
>JH. wrote:
>>>The schematic is not OK...as drawn...the CA3130 stage will not work.
>>
>>
>>Strange drawing indeed. Just look at the second stage with that stupid
>>"white offset" trimmer. Why would you adjust the DC level, when the stage 
>>is AC coupled at input and output?
>
>To prevent it from clipping due to the amplified offset voltage. Something 
>that would be easily cured by rolling off the gain to 1 for DC. (A cap in 
>series with the 1.2k)
>Something which would also help in that first stage. And then one might 
>even DC couple the zehner diode. But I'd rather establish a Ub/2 bias on 
>the + input.
>
>Cheers,
>  René
>
>--
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>
>