On Sun, 23 Jun 2024 18:02:54 -0000 (UTC), Phil Hobbs wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:53:44 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
Okay, let's see if anyone can disabuse me of my ignorance on this
matter...
In the HP service manuals for their equipment they use a few different
symbols in their block diagrams I'm not familiar with. I can't post
images right now but hopefully a description will suffice.
The first one is a circle with a Greek capital sigma inside it. What's
that all about? Is it an integrator? A summing amplifier? What's the
deal here?
Summer, adder. Might just be two resistors in real life. Check the real
schematic.
Next up: a circle with a greek theta over 'f' implying some sort of
division. Is that a phase to frequency comparitor?
A circle with a single cycle of sine wave inside it: oscillator?
Probably. Some sort of sine source.
Plane triangles with nothing inside them. Do they represent generic
amplifiers or buffers?
Could be either. A buffer is an amplifier too.
A circle with just a plane theta inside it. Any ideas?
Phase shifter?
A circle divided into 4 equal slices like it's got a giant 'X' inside
it.
Multiplier. Two inputs and one output?
Also a mixer, which of course is an approximate multiplier.
As per the previous one, but inside a square box.
Probably an IC multiplier.
A circle with a capital 'S' inside it.
Stop sign.
Quadrature (cosine) source. ;)
A square box with two double-headed arrows inside it in a 'X'
arrangement.
Possibly a crossbar switch, or a DPDT wired to interchange two lines (as
used in house wiring to allow 3 or more switches to control one
circuit).
Turned out to be a bi-directional coupler.
Thanks for the other suggestions, Phil (and John).
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