[sdiy] input buffer question

[Scott Nordlund]

For a non-inverting op amp voltage follower, the input is high impedance, so you don't have to worry about the 10K resistor contributing to the input loading.  BUT for the same reason it also won't really offer any protection; you'll probably want clamping diodes to the positive and negative supply rails.  Maybe Schottky diodes if you want to be really cautious.  I don't know why you would put a resistor in the feedback loop, I don't think it would do anything.

----------------------------------------
> Date: Mon, 8 Feb 2010 11:17:16 -0800
> From: dixon at interchange.ubc.ca
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] input buffer question
>
> I want to put a simple non-inverting buffer on my altered version of the CGS
> analog shift register, between the input and the first DG409 multiplexer.
>
> My question is this: Is there a standard operating procedure for applying
> spike protection resistors on such input buffers? I'm thinking 10k
> resistors at the input and in the feedback loop, and nothing to ground. Is
> this necessary/sufficient, and will it affect the accuracy of the subsequent
> S&H?
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
 		 	   		  
_________________________________________________________________
Hotmail: Trusted email with powerful SPAM protection.
http://clk.atdmt.com/GBL/go/201469227/direct/01/