more pictures

[Martin Czech]

:::oscillations after each one. Turned out that I needed approximately one
:::couple
:::of ceramic caps for every four 5532's to keep them quiet. Then they work
:::like
:::a charm. Less noisy than the affordable BiFET amps, especially with the low

Just two unnecessary and not helpful thoughts: (;->)

1.: AD manufactures a rival, it is explicitly mentioned for audio use
    and replacement of 5534/5532, but I have forgotten the device
    number. It was also in some catalogue, Farnel or RS.
    At that time it seemed affordable and the current consumption
    was also less, about 0.5 if I remember right.
    The noise specs were even better then 5534/32.
    Less noise and less heat. Sounded good, then.
    
2.: The 5533/34 has considerable higher bandwidth (compared to TL071), 
    higher bias current
    and higher drive capability. If you look at such an op amp in a
    zero order model (just a resistive device), the internal resistance
    goes down when using said types. This means more cross talk
    to the supplies. OTOH supply rejection is not improved, could
    be even worse for the frequencies of interest due to large geometry
    transistors. All in all this makes these devices susceptible
    to oscillations due to "dirty" wiring, impedance etc.
    I think this is always the case if low noise performance is forced
    by larger bias currents/large geometry.
    
And I forgot:

3.: The TL0x1 family has a member TL051 (since long). It is claimed
    to have larger bandwidth and lower noise then TL071 or TL081.
    At least this is what I think from my head.
    Well, I think these things are only variations of some predecessor
    design, bias currents and geometries adjusted.
    I have never seen anyone using it. 
    
Do we have some diy time lag, use only components if they are 20+ years ? 

;->>   ;->>   ;->>   ;->>   ;->>

    
m.c.