Re: Schematic Symbols

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. ;)