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

[Paul Perry]

Nice one, Justin ;-)

I'm not going to confess the stupidest thing *I* have done.. but a customer 
bought in a broken Frostwave Quad MDI-CV converter. It broke after he 
plugged a CV output into a 1/4 jack in an organ. Why, I can't imagine.. 
anyway, the 1/4 jack was apparently being used as a DIY mains power 
extension (!!!!) and the PCB trace from the CV socket actually blew off the 
board & curled up like a watchspring.
Remarkably, and very fortunately, all that died was a 50c CMOS buffer.
But I do not know what 'protection' I should have used..

paul perry Melbourne Australia

----- Original Message ----- 
From: "Justin Owen"
>>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.