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, Papplewick pumping station, Nottingham, 21,22 April
Bournville June 2nd 2019, 10am
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. ,

Norwich MBC Submariners joint Model Boat weekend - 27/28th July

Grantham MBC, SUN, AUG 11 AT 10 AM
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.Model Boat Convention (Exhibition), 24,25 August

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. Bournville Dive-In (2) MBC, 15th September

,,,,

Barrow in Furness MBC regatta and submarine event, Sunday 22nd Sept 2019,10am

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    Tom(ADMIN)
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    Post  Tom(ADMIN) on Sun Mar 04, 2012 3:04 pm

    Anybody have any ideas to what this piece of electronical wizardry might be? Or what it does?
    I'm guessing it's a motor speed controller of some description...it's quite ancient, probably dates back to the 80's at a guess. The plugs look like early Futaba, possibly M series?


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    Post  tattooed on Sun Mar 04, 2012 3:07 pm

    god you have some junk in that tool box of yours rich lol
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    Post  Tom(ADMIN) on Sun Mar 04, 2012 3:11 pm

    tattooed wrote:god you have some junk in that tool box of yours rich lol

    Junk? It could be valuable, son!
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    Post  profesorul on Sun Mar 04, 2012 3:42 pm

    Maybe for the Archeologies.Ha,Ha.
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    Post  tattooed on Sun Mar 04, 2012 4:35 pm

    make a good paper weight mate
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    Post  Tom(ADMIN) on Sun Mar 04, 2012 4:39 pm

    mutter mutter...
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    Post  Hermann on Sun Mar 04, 2012 5:07 pm

    Hi Richard,

    maybe it's a simple switch unit that will close a contact between the red and the black cable of the Tamiya-Connector (normally used for battery connection). On a magnified photo I could discover that these cables are obviously associated to the center contact (C)and the normal open (NO) contact of the relay. If the relay will be energised it will provide a short between the red and the black wire (so do not connect the Tamiya-Connector to a battery!) The small circuit board may carry the electronics for signal evaluation and control for the relay. Maybe the two cables for receiver connection are only two alternatives for different types/ manufacturers of receivers.

    If you made more close-up photographs of the ciucuit board I might discover more to identify the purpose and the function.

    Kind regards
    Hermann
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    Post  Tom(ADMIN) on Sun Mar 04, 2012 5:13 pm

    I can do that Hermann..



    Last edited by Richard(Admin) on Mon Mar 05, 2012 8:20 am; edited 1 time in total
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    Post  Tom(ADMIN) on Mon Mar 05, 2012 8:19 am

    Are these any better? I'm still learning to drive my new camera...

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    Post  david f on Mon Mar 05, 2012 8:39 am

    I think that Hermann is right - looks as if it is a r/c on/off switch.(Not enough components for a speed controller. It has some nice old transistors in there - nice metal cans!

    David
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    Post  Tom(ADMIN) on Mon Mar 05, 2012 8:44 am

    Thanks David...at least I have an idea now of what it is. I don't suppose I'll ever use it, so it can go into my Historic Items box!
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    Post  nigele(ADMIN)2 on Mon Mar 05, 2012 10:41 am

    I think it is a speed controler,if you look at the relay output the cables are wired across both sets of poles,that would indicate to me that it is reversable,it also apears to have two pots for adjustments,one for nuetral and one for max speed?????.
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    Post  Hermann on Mon Mar 05, 2012 6:03 pm

    Hello Richard,

    the new more close up photographs confirm my first estimation so I am sure that this is a switch unit. That big black device with marking "NEC Malaysia 7805..." is an integrated 5V fixed voltage regulator that provides a stabilised 5V supply for the electronics on that circuit board (or even for the receiver that is connected to, as a bec function). In front of it I can see a vertical mounted black diode that is the free wheeling diode for the relay coil. Beneath the wiring I can discover a 14 pin integrated circuit device of type CD 4011, a quadruple 2 input NAND Gate, here obviously used for generating a reference pulse and pulse length comparison (that is used for the switching point). The metal can transistors seem to be used to drive the relay coil and the potentiometers may be used to set the switch point.

    @ Nigele: For the first moment I also thought about a reverse switch relay but in that case we would need both contact sets of center contact (C), normal closed contact (NC) and normal open contact (NO). Here only the center contacts (switched in parallel)and the normal open contacts (also switched in parallel) are wired and used.

    Unfortunately the circuit board layout can't be seen conpletely so reconstruction of the circuit diagram is not possible yet. But I am quite sure that this is a switch.

    Kind regards
    Hermann
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    Post  Tom(ADMIN) on Mon Mar 05, 2012 6:09 pm

    Thanks for your kind assistance Hermann, much appreciated. I'm totally confused now...I think it will be going on a museum shelf in my lounge along with a few other antique items I have left over from the 70's-80's. When visitors ask me what it is I'll give them your name and address!!
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    Post  Hermann on Mon Mar 05, 2012 6:17 pm

    Yes Richard,

    and if they come to visit me they can see even more old stuff that I have collected over my time as a modeller...
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    Post  Hermann on Mon Mar 05, 2012 6:36 pm

    ...for example the interiour of my old model of a harbour tug (that I built as a young lad about 40 years ago).
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    Post  Hermann on Mon Mar 05, 2012 6:45 pm

    ...and more old equipment: an old radio control set (Type Variophon, 10 channel transmitter - looking like a transistor radio - manufactured by company GRUNDIG and distributed by GRAUPNER in the sixtees and early seventees, some receiver modules and some old servos)

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    Post  david f on Tue Mar 06, 2012 10:31 am

    Oh wow! That is lovely.

    Now if only I hadn't thrown out all me dads r/c gear, I could contribute.

    I remember building an early proportional setup for him "The Galloping Ghost". It translated pwm into actual pulses on the control surfaces. Now that had to be seen as well as heard.

    Now in landfill somewhere, sadly!

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    Post  Tom(ADMIN) on Tue Mar 06, 2012 3:23 pm

    David!! How could you! My earliest radio set I owned was the McGregor single channel, the one in the blue case.

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    Hermann, that is one amazing tug you built there, very impressive sir!
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    Post  Hermann on Tue Mar 06, 2012 8:50 pm

    Hi Richard,

    very wise descision to keep this single channel radio control set alive - show it to young modellers today ( if you may find someone) and they will be surprised that it was possible to control a model with one channel only.


    Thank you for the compliments for my tug. To see it completely I have added some more photographs...
    Running this model again after a long time makes fun ( although it is not a submarine).

    Best regards
    Hermann

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      Current date/time is Tue Apr 23, 2019 5:21 am