On Mon, 13 Sep 2010 15:06:18 -0700, John Larkin
wrote:

On Sun, 12 Sep 2010 10:23:52 -0700,
wrote:

On Fri, 10 Sep 2010 08:20:34 -0700, John Larkin
wrote:

On Fri, 10 Sep 2010 12:19:22 +0100, Eeyore
om wrote:

John Fields wrote:
On Mon, 06 Sep 2010 01:47:41 +0100, Eeyore
m wrote:

Fred Abse wrote:
On Sat, 04 Sep 2010 07:56:51 +0100, Eeyore wrote:

Do please especially explain the relevance of the letter Q to indicate a
transistor or U for an IC.
No sillier than "L" for inductance, or "Z" for impedance, or "Y" for
admittance, or "B" for susceptance, or "G" for conductance.
What kind of equations do you use for calculating impedances ?

For example Z = 2.pi.f.L is a common one.

---
That's only true because:

Z = sqrt (R² + (Xl - Xc)²)

and it's the only circuit element being considered.

More correctly, 2pi f L is considered to be the "inductive reactance"
of an inductor, and the equation is written:

Xl = 2pi f L
---

L is clearly a well-understood 'shorthand' for inductance along with R
and C for resistance and capacitance.

I don't know of any components requiring designation on a schematic or
PCB that require defining by Y, B or G,

---
"Y" is the reference for any sort of resonator, but more particularly
for the ubiquitous quartz crystal resonator.

"B" is the reference designator for a blwer, motor, or synchro, and
"G" is the reference designator for, among other things, a generator.

In the USA only.

Graham

Post a real schematic of something you've designed.

John

What a nice absurdity that you (JL) should post that here.

I post lots of schematics, some doodles and occasionally actual
production stuff. Mostly I put them on my FTP site or Panoramio and
post links in SED. Or do ASCII art for the simple stuff.

Do you ever post schematics?

John


Yes, and sometimes with component values. I don't remember yours
having component values; maybe it is just very infrequent for you to
include them.