[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[diditmyself]

 

[RLCrisp]

What kind of probe are you using? A 1x probe will add more load capacitance to the scope's 20pf which some of the opamps might not like much even though the frequency is pretty low. A 10x probe will minimize the capacitive loading (but make sure it is properly compensated!).

 

[diditmyself]

I don't use a probe for the results above. I use a very short shielded cable. When I use the probe (I have an original non-adjustable Tektronix that came with the scope and a Philips 100 MHz 10:1 adjustable capacitance), I get slightly slower rise and fall times only seen when the wave is maginfied ten times. No dramatic difference.

The scope is a 100 MHz digital storage Tektronix 468.

 

[Jocko Homo]

I realise that this is a bit o/t but......

I can't think of many things that sound worse than an op-amp wired to be a buffer. If I ran across a circuit that needed one, I would find a way to design something else.

Of course, there are ways to lower the signal into the op-amp, and run it at higher gain. Been used over the ages for op-amps that are not unity gain stable.

Did a (non-audio) design for someone a year or two ago. One of the ones we looked at was the ADA8499-1. We ended up using something that had a wider common-mode range. Glad to know that it at least looks nice on the 'scope.

Good job, young man. Keep up the good work.

Jocko