[sdiy] Dual 914 diode in a SOT-23 package?

[Harry Bissell]

OK it's...

http://www.analog.com/library/analogDialogue/archives/39-06/Chapter%209%20Hardware%20Design%20Techniques%20F.pdf

check the overvoltage protection techniques...

H^) harry



----- Original Message -----
From: Justin Owen <juzowen at gmail.com>
To: SDIY List <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 13 Mar 2012 05:16:22 -0400 (EDT)
Subject: Re: [sdiy] Dual 914 diode in a SOT-23 package?

Hi Neil,

>> The diodes will be used as per this schematic:
http://www.sdiy.org/juz/euro_input_detail_02.pdf

>I don't remember seeing that particular combination.  Anyway, I would  
remove D10 and D11

Why is that? Op Amp Cook Fig. 3.13 shows it as Common-Mode Input Protection.

>and D8 and D9 must be low-leakage types,  
definitely not 1N914.  Otherwise you'll likely get horrible non- 
linear behaviour.  See section 3.2.1 of IC Op-Amp Cookbook for examples.

I'm looking at Fig. 3.12 and it definitely has 914s listed.

I am using a first edition of that book though....

Not disagreeing with you - just asking for clarification. The last time we had this thread it did kind of end up as a three way tie so I know there's some different opinions on this matter.

Cheers,

J







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-- 
Harry Bissell & Nora Abdullah 4eva