[sdiy] The annual I/O DARWIN protection thread! (revised)

[Harry Bissell]

The best one I've ever seen was...

A user had a 9V powered guitar stompbox.

The battery was, of course dead, so he...

happened to have an extra battery snap.

And there was an unused lamp nearby, so he...

cut the power cord off the lamp and...

twisted the wired to the battery snap and...

plugged the two battery snaps together and

plugged the line cord into the wall.

This came to a freind of mine for repair, The 'user" figured the repair should not
cost much, as the box still made some sound (like 60Hz hum). There was a rattle
inside the unit. I found the top of the one IC the box used... blown clear off the
top of the chip. There was a crater where the die once was.

It was a 741. THey are tough little buggers, however they are not immune to atomic
power levels (well, except in spice simulations but that's another story...)

H^) harry


----- Original Message -----
From: Justin Owen <juzowen at gmail.com>
To: SDIY List <synth-diy at dropmix.xs4all.nl>
Sent: Thu, 14 Jul 2011 15:04:50 -0400 (EDT)
Subject: Re: [sdiy] The annual I/O impedance/protection thread! (revised)

-----Original Message-----
From: Neil Johnson [neil.johnson97 at ntlworld.com]

>Well, since you seem unable to provide any *specific* requirements for
>what you are hoping to protect the outputs from

You're right - I am completely unable to provide a *specific* list of all the accidental, dumb, absent-minded, drunken, drug-induced, malicious, hilarious and OMFG things that people might do to damage a circuit...

...but I'm still going to keep building them.

Justin

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-- 
Harry Bissell & Nora Abdullah 4eva