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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Schematic Symbols
Date: Sun, 23 Jun 2024 11:06:24 -0700
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On Sun, 23 Jun 2024 18:02:54 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> 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. ;)

"ALL WAYS"