[sdiy] cem3328 questions

[tony Rolando]

Last night I tied the inverting input to ground and the circuit is actually 
improved in my opinion. I say this because with no audio inserted I am 
getting larger output swings when the filter is put into self oscillation.

I reworked the then unused op-amp into an output buffer for the cem3328 
following it with a 680 ohm resistor.

The sound is nice. Let me know if anybody is interested in trading something 
for one of these 3328.

TR


>From: "tony Rolando" <goldenechos at hotmail.com>
>To: cfmd at bredband.net, lanterma at ece.gatech.edu
>CC: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] cem3328 questions
>Date: Mon, 19 Feb 2007 07:34:01 -0500
>
>I just built myself a CEM3328 Low Pass filter using the application notes 
>from the data sheet and my limited design skills. The module works well. I 
>buffered all of the Audio and CV inputs, put some bypass caps in there and 
>added all of the ins and outs you could want.
>
>I would like to get some opinions on two things though...
>
>Should have buffered the output, because I feel like I should have even 
>though there is a buffer on the (expensive) chip? (I think I already know 
>the answer to this one).
>
>In my audio input buffering stage I have a non-inverting follower directly 
>followed by an inverting follower thus making use of the 3328's 
>differential inputs. Could I have just tied the inverting input on the 3328 
>to ground and used a non-inverting buffer stage on the audio input?
>
>Thanx for reading,
>
>TR
>
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