[sdiy] Reprinting Electronotes

[Ian Fritz]

At 12:47 PM 12/14/2002, jhaible wrote:

>Or take my / our current interest in String Filters:
>Reading about Ian's and Bernie's different implementation, and which
>one is less noisy, is an interesting question even though we have
>much better opamps today.

To further clarify this -- I chose a low-noise transistor approach because 
I *hoped* it would give improved noise performance.  I never confirmed 
this. In fact, the gain of the circuit is so high that there is quite a bit 
of noise anyway.

Recently I tried to make a low-noise preamp using the LM394 super 
transistor as in the NS app notes. I could not get it to work as well as a 
low noise op amp (OP27).  So if I were to make a filter bank today I would 
probably use something like the OPA4227 or LT1125. These are quad versions 
of improved OP27 devices.


>I'm surprised that this copyright issue still causes such a long
>thread many years after the "incident". Personally I don't think
>most of EN is legally copyright protected (I may be wrong,
>but JDM's explanations from previous threads seem very convincing),
>BUT I would respect the copyright NEVERTHELESS, out of decency.

I agree. Give him the benefit of having the same privilege as he would have 
under current law. It's the RIGHT THING TO DO.

What is particularly annoying about the current thread is the people who 
are, effectively, accusing Bernie of being selfish for wanting to continue 
to make money from his material.  I saw -- directly, with my own eyes -- 
the incredible amount of work that went into producing the newsletter, and 
I was always amazed at the very low subscription cost.  In my view, it's 
people who insist on getting something for nothing who are the selfish ones.

   Ian