[sdiy] Serge and multiples

[Happy Harry]

Most folk worry about inputs. Bipolar processes are pretty good
for static handling. If you were REALLY leery, you could split that
series output resistor, and use MOV, zener, or fast diodes to the rails to 
either eat the static discharge, or direct it to a place where it can 
dissipate harmlessly.

But I've never seen a bipolar opamp die of static discharge at the output, 
or even degraded operation. This is more likely if you are using a voltage 
follower (output tied to inverting input) than a
unity gain inverting stage (with resistors in the feedback).

Still I would not worry... I'm not landing my synth on MARS if you know what 
I mean  ;^)


H^)  harry


>From: Martin Czech <czech at Micronas.Com>
>Reply-To: Martin Czech <czech at Micronas.Com>
>To: grichter at asapnet.net
>CC: synth-diy at node12b53.a2000.nl
>Subject: Re: [sdiy] Serge and multiples
>Date: Mon, 5 Mar 2001 13:12:41 +0100 (MET)
>
>
>:::Another reason for the resistor is to limit the current of static 
>discharge
>:::going INTO the output. The inductance and resistance of the resistor 
>will do
>:::a lot to limit a static spark into an output.
>
>If we talk about 1k Ohm, the HBM model has intrinsic 4k,
>so that series resistor won't do much about the ESD current.
>A low impedance discharge path is an apropriate way to
>avoid to high potential differences due to static discharge current
>(about 3...4 A).
>
>We assume 100k as foolproof series resistance, ie. we do not
>look into circuits behind such a resistor.
>
>
>m.c.
>

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