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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Schematic Symbols
Date: Sun, 23 Jun 2024 18:02:54 -0000 (UTC)
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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).
>> 
>> That just about covers it. Any assistance would be most welcome!
>> 
>> Your pal,
>> 
>> CD
> 
Cheers 

Phil Hobbs 


-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics