Hi Brett,
 
  What you have point out is correct but they are not insurmountable  
problems. In the early 60's, an era when there where no IC or matched pairs  just 
single germanium transistors, I had to build op amps out of them and  that 
was for d.c. operation. Some years after that the IC version arrived,  
plagued with Popcorn noise' something you rarely hear about nowadays.
An acceptable stability over a period of 20 seconds or so is not  
unrealistic and I do not expect it to be easy but it is a good challenge.
 
 
Regards Martin
 





Hi Brett,
 
  What you have point out is correct but they are not insurmount=
able=20
problems. In the early 60's, an era when there where no IC or matched=
 pairs=20
just single germanium transistors, I had to build op amps out of them=
 and=20
that was for d.c. operation. Some years after that the IC version arrived,=
=20
plagued with Popcorn noise' something you rarely hear about nowadays.
An acceptable stability over a period of 20 seconds or so is not=20
unrealistic and I do not expect it to be easy but it is a good challenge.<=
/DIV>
 
 
Regards Martin