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Posted: Wed Oct 12th, 2016 08:07 pm |
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11th Post |
Herb Kephart
Moderator

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Bob--
''Being smug about it" could be easily taken as an insult--and while I could have phrased it better, it wasn't meant to be one.
And I realize that to someone like your self it makes perfect sense, it is very frustrating to someone who is trying to decipher what is meant.
Impossible often. Just about the time that I learned (if I haven't forgotten) the symbol for a PNP transistor--there are nine new things that get thrown in the mix.
So I just hack away at my card and posterboard with an Exacto knife. even then, I learn new words right along---when the part starts to turn red.
Hemoglobin Herb
____________________ Fix it again, Mr Gates--it still works!"
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Posted: Wed Oct 12th, 2016 10:50 pm |
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12th Post |
Posted: Wed Oct 12th, 2016 11:02 pm |
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13th Post |
Si.
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Joined: | Thu Feb 23rd, 2012 |
Location: | London |
Posts: | 5948 |
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Hi Doug
BRAVO !!
This is exactly the kinda thing I'm getting at.
I should really Post my full ideas on the whole caboodle...
...I will soon.
It involves a kinda 'crossover' splitting Bass from Treble.
But NOT at the 'typical' 3000 Hz of a Hi-Fi speaker.
More like around 100 Hz or so.
Doug, that $2 MP3 player looks AWESOME !!
I like the fact that it has a proper external PSU connection.
The one I ordered doesn't, it has an internal LiPo battery.
I would much prefer a decent PSU, sans the battery.
I have not seen this type of packaging in my searches.
Thanks Doug !
This is why starting crazy threads is worth doing !!

Si.
Just found the general type
With the search term 'MP3 module remote' or 'panel mount' etc.
____________________
' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1
' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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Posted: Thu Oct 13th, 2016 12:51 am |
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14th Post |
slateworks
Registered

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Hi Si. Yes, this is the one I bought a couple of but I made a mistake with the price - it was £3.00 not £2.00!
http://www.ebay.co.uk/itm/162114882488?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Hate to think what that would be in dollar terms today with the pound shrinking like it is but still pretty cheap.
The ones you found have the addition of Bluetooth which mine doesn't and possibly an on-board amp so may be connectable direct to speakers. I did try to get more info from a couple of sellers but they weren't at all forthcoming so I may just buy one to find out for myself.
Last edited on Thu Oct 13th, 2016 12:55 am by slateworks
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Doug
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Posted: Thu Oct 13th, 2016 01:43 am |
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15th Post |
Si.
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Joined: | Thu Feb 23rd, 2012 |
Location: | London |
Posts: | 5948 |
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" I made a mistake with the price - it was £3.00 not £2.00! "
Hi Doug
YOU TRYIN' TO BANKRUPT MY RAILROAD ?? !!
I swear I only had £0.50p a week pocket-money, back in the '70s !!
Don't worry, I can deal with the 50% inflation.
I'll save-up an extra week or two !!
Thanks again Doug !
I have now seen the 3W-amp versions, Bluetooth & screen-less versions ... PHEW !!
All good stuff !
Panel-mounting, with external-power, is def. the way forward !!
I'm gonna reconsider my specs. for the project...
...& order one of the panel-mount MP3 players to experiment with.
3W-amp looks interesting.
Remote-control less so, as would control ALL players unselectively...
...could blank off IR receiver though.
Mmm...
Good news !!
____________________
' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1
' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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Posted: Thu Oct 13th, 2016 03:13 am |
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16th Post |
Posted: Sat Oct 15th, 2016 12:53 am |
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17th Post |
Si.
Moderator

Joined: | Thu Feb 23rd, 2012 |
Location: | London |
Posts: | 5948 |
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Hi Doug 
I checked out all the panel-mounted MP3-players I could find.
If you have a specific question on one you've looked at, I could probably answer it.
Broadly speaking, they either come WITH or WITHOUT built-in amplifiers.
Yours, which are kinda 'the car version', as you know, don't have built-in amplifiers.
The versions advertised as having 3W+3W amplifiers, all seem to be based around a pair of 8002B digital-amplifier chips.
They output 3 Watts @ <10% distortion, probably around 1 Watt @ <0.1% distortion.
Not too bad, all things considered.
If the built-in amplifier is not required, a 'normal' line-level output can be taken from Pin-4 of the chip (I think).
The 3 Watt 'digital-output' of these models, CAN NOT be fed into a regular sound-mixer, SMOKE will result.
This is due to the fact that the digital-amplifier output has no 'real earth' connection.
Taking a wire from Pin-4, for feeding into any regular line-level audio-gear, should work fine though.
I looked at all the options & took a punt at this one below.
Including remote-control & wiring-looms, inc. P&P, it cost me £2.02p !!
Further units, sans remote-control, could probably be haggled-down to maybe £1.50p each ??
I am thinking that >> THE REPLICANT << might well use 8 or more of these units.

What I liked about this one is :-
It has the 3W+3W built-in amplifier.
It has a very-small front-panel area, perfect for a cluster of 8 or more, in an A.B.S box.
All 'hidden' functions, without buttons, are accessible using the remote-control, ie. E.Q. settings, Repeat-mode, Track forward/backward, Volume up/down etc.
Since it doesn't have a built-in F.M-Radio, the screen for this, is not needed.
Access to the 1/2 dozen Tracks one might have on the SD-Card, is simply done 'screenless' using the remote-control.

More . . . s o o n . . .
Si.
____________________
' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1
' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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Posted: Sat Oct 15th, 2016 12:59 am |
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18th Post |
Posted: Sat Oct 15th, 2016 01:01 am |
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19th Post |
Posted: Sat Oct 15th, 2016 01:03 am |
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20th Post |
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