[sdiy] Diodes - best practice or superstition?

[Neil Johnson]

Hi,

Justin Owen wrote:
> http://www.sdiy.org/juz/hwr_variations_01.pdf
>
> A) shows my current set-up where IC1A is an input at 100K impedance for an external source that could be AC or DC and anywhere between approx. +/-10V at anything from 20KHz down to LFO/Gate on a +/-12V supply. This feeds a half-wave rectifier which feeds a buffer. Nice stout input, dedicated half-wave rectifier, nice stout output (at 1K impedance).
>
> So - ignoring the inversion path - is there any reason why I shouldn't just use B) with R5 setting the input impedance and
> R9 setting the output impedance?

The input impedance of solution B will be 100k, so that's fine.  But
the output impedance of solution B will be all over the place.

> And a follow up question - any reason why I shouldn't swap the 914s for 4148s? Seems like 4148s come in many more package sizes than the 914.

For all intents the 1N4148 and 1N914 are interchangeable.

http://en.wikipedia.org/wiki/1N4148

Neil
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