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

[Harry Bissell]

----- Original Message -----
From: Justin Owen <juzowen at gmail.com>
To: SDIY List <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 12 Jul 2011 12:03:48 -0400 (EDT)
Subject: [sdiy] The annual I/O impedance/protection thread! (bumped)


3) Summing: http://www.sdiy.org/juz/euro_summing_01.pdf

Q: Is there a case for a buffer before the attenuation Pot? If I'm protecting my I/O from unknowns - is it odd to assume that suddenly that input will be prepped to 1K impedance no matter what?

All of these depend on how unknown the unknowns are. If they are from your own synth, the signals probably cannot exceed +/-15V in which case a high
enough value for the pot is all the protection you might need. I don't see a case for an added buffer. Ohter than that, its the same as the first two cases, what does the resistor need to be to prevent the zeners (or itself) from too much power.

Thses are good questions, btw. The trade-offs in protection circuits aren't always obvious (or agreed upon)

H^) harry



Thanks heaps.

Justin

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-- 
Harry Bissell & Nora Abdullah 4eva