Submitted 1 week ago by poplargrove@lemmy.world to askelectronics@discuss.tchncs.de
https://lemmy.world/pictrs/image/f4220010-79eb-44ff-b124-7d2416893530.png
I haven’t really been able to find much on this. I recognize the totem-pole and what that’s for. Would love help understanding:
Triangle is an amplifier and rectangle is a black box (“don’t worry what’s in here, we promise it’s not gremlins”).
I suspect that the box might be a biasing array for driving the two output transistors, but then I would also expect two wires to come out of it (one for each transistor) rather than a single combined wire.
Broadcom’s datasheet for their version of the part seems to be more akin to what I’m thinking:
Could be either. You’d have to decap the chip to find out, the datasheet writers thought these details were not important.
rectangle is a black box (“don’t worry what’s in here, we promise it’s not gremlins”).
It’s where they store the magic smoke.
Lol at the extra wide opamp
The triangle is an opamp, as for the other two questions… Don’t know, biasing resistor bridge? Not sure why it would have that though
It cannot be just a bridge, or else its output woukd stay constant regardless of input. There are other mandatory resistors missing in the diagram though.
ChaoticNeutralCzech@feddit.org 1 week ago
The triangle is an opamp. Its output (right) is the difference of inputs (left) (plus some small offset due to manufacturing tolerances) multiplied by a large number (million or more), capped to more or less the voltage of its power rails. In most uses, there is a feedback so the output influences inputs to equalize them, effectively creating an amplifier whose voltage amplification is set by rhe strength of the feedback. Without a feedback, the opamp’s output will be either GND or Vin depending on the which input’s voltage is higher. An opamp in this configuration os known as the comparator.
The rectangle looks a bit like a European-style potentiometer but it isn’t.
Maybe two outputs because DIP-6 packages are uncommon and they went for the standard.