[sdiy] Electronotes, op-amp substitution, thru-zero oscillator...

[Romeo Fahl]

Hi,

I've built both the Electronotes Option 4 Thru-zero VCO and the EN 129 
version.  What would you like to know about them?

LM307s are just basically bread and butter opamps, I think an improved 
741.  When in doubt, use a TL071.  I've subbed all sorts of opamps in 
EN projects and they work fine.

Romeo


On Jan 12, 2006, at 8:22 AM, rdrake wrote:

> my holiday present to myself was the complete set of Electronotes 
> (thanks, Bernie--now my head's about to explode, and there's $200 
> worth of parts in my Jameco shopping cart).  seriously, i should have 
> gotten these years ago, what a treasure trove.  i'll be digesting for 
> months, hopefully some of what i do by trial&error will start being 
> guided by something more than guessing.
>
> most of the circuits show older op-amps, and there's some info on 
> substitutions, but there's still some holse.  specifically, i'm 
> wondering about what to use for the lm307s in the Random source option 
> 2... and more generally, what characteristics (in order of importance) 
> should i be concerned with matching when choosing modern equivelents 
> of older ICs?
>
> i'm also looking at the thru-zero VCO... pretty complex project, but 
> i'll never be buying one from cyndustries... any of you oldtimers ever 
> build one of these beasts?
>
> bbob
>