[sdiy] Buffer question

[Oren Leavitt]

On 1/30/2012 3:39 PM, Elain Klopke wrote:
> Hey all,
>
> Quick question, if I'm using a 4013 or 4520 for generating sub
> octaves, do I need to put an op amp on the output to buffer it or can
> I send the output straight to a jack?
>
> -Ian (full of stupid questions) Smith
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Ian,
I would buffer it and level shift it to +/-5V with an op amp.
CMOS will latch and release the "magic smoke" if something in the 
"outside world" pulls its output above the Vdd pin.

...Or you canprotect it with a schottky diode between the output and Vdd 
(cathode to Vdd) and a 1K resistor between the output and the jack.