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PRC as a amplifier in GPS question.

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Trevor Wilson

Wed Aug 17, 2016 2:40 am   

On 16/08/2016 7:09 PM, Phil Allison wrote:
Trevor Wilson wrote:

** Yes - operating is very easy and intuitive and the trace is quite
sharp and bright. Being analogue means what you see is always real.

**Except at high writing speeds. Even with a PDA tube, the trace will
dim with higher horizontal settings. Doesn't happen with a DSO.

*** Does not happen with my 821 either.

The same cannot be said for DSOs like the Rigol.

Learning to use one is quite tedious and you can never really trust
what you are seeing

**I think that is a bit of an over-statement.

*** Think whatever you like.

Whilst an analogue 'scope
may be better under SOME conditions, DSOs are good for 90% of applications.

** That is definitely a wild overstatement.

Something TW is world famous for.

- the fact that sampling is at a *different rate*
with each step of the horizontal means the usable bandwidth is
constantly changing and there are strange artifacts from aliasing

**That much is true. Vertical resolution seems to be still quite poor on
even high end DSOs. Analogue 'scopes rule here.

*** Yes, there is sometimes hundreds of times more information in a good scope trace than a grainy DSO screen - which always looks like noise to me.

What you see in never in real time, there is always a delay and even
when the input signal stops, the DSO continues to display it for over
a second.

**I just checked my 1054Z. I don't have the time or the facilities to
measure it, but I'd estimate way less than 100msec for both. The delay
is not noticeable.

** But it is long enough to completely miss contact noise when you operate a signal switch while rotating a good pot produces visible noise all the time.

I find the DS1025E near unusable for trouble shooting work.

**Which is exactly why I dumped mine for the 1054Z. MUCH better 'scope.
Picking up noisy pots and switches is a doddle.

Trevor Wilson

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Thu Sep 01, 2016 11:56 pm   

>You can try this link to purchase a Ness 500 keypad from alarm maintenance
These keypads are obsolete and hard to find

Rod Speed

Sun Sep 18, 2016 2:17 am   

"Daniel" <nidan.danny_at_gmail.com> wrote in message
On Friday, 16 September 2016 18:27:29 UTC+10, F Murtz wrote:
Pete wrote:
Peter Jason wrote:

It seems the power saving is nil unless the "container" is
replaced/altered to bypass the ballast & starters.

Doesn't taking the starter out remove the ballast from the circuit?


With the ones I have you put a short in place of the starter, so no.

if you do that then you will get almost the whole of your mains supply
voltage across your ballast... hear a big bang on energisation... your
protection operating... and you will probably be the owner of an

Nope. That’s the way plenty of LED tube replacements do it.

i would suggest it's just left open circuit.... the ballast is basically
there to provide
the inductive back emf high voltage kick to get the gas to ionise inside
the tube...

Its actually there to provide a choke to limit the current thru the tube
once it fires.

once it's struck the starter stays open and the ballast remains in the
(most of the voltage falls across the lamp) but doesn't do much except to
stabilise fluctuations in the operating point of the circuit

Thanks for that completely superfluous proof that you
have never had a fucking clue about anything at all, ever.

and as a safety component to limit the current prior to the fuse/circuit
operating in case of the unlikely possibility of a short occurring across
the lamp itself.

Thanks for that completely superfluous proof that you
have never had a fucking clue about anything at all, ever.

i would also suggest that fluoros are pretty energy efficient and my gut
feeling (based on experience) is that the cost saving wouldn't be worth
i'd have to do the calcs to be sure of that tho. a significant factor is
the number
of times you turn them on in a day... as on start up they consume the most


Tue Nov 01, 2016 3:53 pm   

On Tue, 01 Nov 2016 21:34:09 +1100, F Murtz wrote:

A child of 5 or 6 high functioning autistic,is there some way to
introduce arduino type

Buy him a kit to play with.
Tell him if he doesn't want it, he can give it back to you,

IME, they have to decide what interests them.

Maths, logic problems are really easy stuff and may not indicate the
ability to do deeper work. books of puzzles might be all that they are
interested in.

Basically, they are only 5-6, just liable to be fanatical/absorbed if it
interests them.

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