Ad Widget

Collapse

Announcement

Collapse
No announcement yet.

Grounding and reverb tanks

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Originally posted by g1
    The only thing lower than a B input would be an A, and I've never seen one directly driven by an op amp, they can not provide the current.
    Are you biased against op-amps? If we look at the lowly LM3875, we see it can source a respectable 3.5A at 16V but only 1A at 48V. Like I said, it really depends on the circuit but I appreciate the anecdotes, keep'em coming Modern op-amps can deliver lots of current at low voltages and that's why they're now ubiquitous on sources. The output transformers are the reason tube amps can drive such low impedences. Tubes are high voltage devices by nature and as a general rule, don't mind high impedences but I get your point.

    Comment


    • #17
      LM3875 is a power amp IC. Op amps are voltage amps in the commonly used nomenclature.
      In this specific case we are driving with a 5532 op amp. Not much current available.
      As far as anecdotes, there are some IC drive circuits that use paralleled IC sections specifically due to the op amp limitations. But they still use no less than a B input impedance tank.
      We were recently discussing solid state drive into A input impedance tanks in another thread. The only examples given used transistor current amps (push pull) to boost the op amp drive. I believe they were Yamaha and Yorkville circuits.
      I suppose you could use a power amp IC and there probably are modern circuits that do so. But you will have to beef up your circuit and those chips all need heatsinking.
      Originally posted by Enzo
      I have a sign in my shop that says, "Never think up reasons not to check something."


      Comment

      Working...
      X