The Association of Model Submariners.

Would you like to react to this message? Create an account in a few clicks or log in to continue.

* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *


David Forrest.. 14212712

Just a reminder that this Forum will close for posts next November (2025) . It will continue to be available as a reference on the Wayback Machine https://web.archive.org/

David Forrest.. 14212712

For a guide to past events see the "Shows and Events" section.
B i
::::

S

P~~~

$$$

Who is online?

In total there are 6 users online :: 0 Registered, 0 Hidden and 6 Guests

None


Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» Microprocessor choices
David Forrest.. EmptyWed Dec 04, 2024 7:26 am by geofrancis

» Robbe Seawolf V2
David Forrest.. EmptyWed Dec 04, 2024 7:17 am by geofrancis

» Futaba -868/915mhz equipment
David Forrest.. EmptyTue Oct 29, 2024 4:46 pm by tsenecal

» RC Drift Gyro for pitch control
David Forrest.. EmptySun Oct 20, 2024 2:04 pm by geofrancis

» WW2 mini sub build
David Forrest.. EmptyThu Oct 17, 2024 2:34 pm by geofrancis

» sonar data link
David Forrest.. EmptyMon Oct 14, 2024 4:31 pm by geofrancis

» ExpressLRS - 868/915 Mhz equipment
David Forrest.. EmptyFri Oct 11, 2024 8:58 pm by Marylandradiosailor

» Flight controllers as sub levelers
David Forrest.. EmptyFri Oct 11, 2024 8:14 pm by geofrancis

» 868/915 Mhz as a viable frequency for submarines.
David Forrest.. EmptyThu Oct 10, 2024 3:21 am by tsenecal

Statistics

Our users have posted a total of 12536 messages in 1992 subjects

We have 1021 registered users

The newest registered user is Mike Echo

3 posters

    David Forrest..

    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3026
    Join date : 2010-11-05
    Age : 64
    Location : Nevada, USA

    David Forrest.. Empty David Forrest..

    Post  Tom(ADMIN) Thu Oct 31, 2013 9:15 am

    David, the time is rapidly approaching for me to wire up the air pump in the Dragonfish...out of the two boards you kindly sent me, which one will be favourite to run the little Koge air pump? Please tell me it will be the smaller of the two as things are getting very tight in the wtc!

    If neither will do the job, do you have a circuit for a simple electronic, non reversible, on/off switch? The air pump can only handle a maximum of 4.8v, by the way.


    Richard


    David Forrest.. Photo_41

    David Forrest.. Photo_42
    nigele(ADMIN)2
    nigele(ADMIN)2
    AMS Chairman


    Posts : 1107
    Join date : 2010-11-06
    Age : 70
    Location : Braintree, Essex

    David Forrest.. Empty Re: David Forrest..

    Post  nigele(ADMIN)2 Thu Oct 31, 2013 1:59 pm

    Niether Richard,they will not work anywhere near 3volt, they really need around 12volt although I have run one at 9.4 and it seems ok.
    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3026
    Join date : 2010-11-05
    Age : 64
    Location : Nevada, USA

    David Forrest.. Empty Re: David Forrest..

    Post  Tom(ADMIN) Thu Oct 31, 2013 3:24 pm

    A one word answer....naff!
    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3026
    Join date : 2010-11-05
    Age : 64
    Location : Nevada, USA

    David Forrest.. Empty Re: David Forrest..

    Post  Tom(ADMIN) Fri Nov 01, 2013 8:51 am

    How about this, then...Ripmax Xtra 12 one way esc, will work on eight cells, handles 12a, and it's a microscopic little thing, fits in the wtc much better.

    David Forrest.. Photo_45
    david f
    david f
    AMS Treasurer


    Posts : 2412
    Join date : 2010-11-10
    Age : 74
    Location : Cumbria

    David Forrest.. Empty Re: David Forrest..

    Post  david f Fri Nov 01, 2013 9:07 am

    Hi Richard,
    Sorry but they "do what they say on the tin."
    And the tin says 12v!

    (What you have  are 12v H bridges which will give you reversible motor control at several amps. They are principally for water pumps and piston tanks where 12 volts is the norm. Please send them back if they are no good to you.)

    To switch a 4.8 v motor just on and off is easier. The good news is that the PIC chip will give the output which can can then trigger a single transistor for on/off. The bad news is that I don't have anything off the shelf. Is there nothing commercially available to do the job? A r/c controlled switch?

    David

    PS I have just seen the post you have just added. That looks like the bad boy you want!
    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3026
    Join date : 2010-11-05
    Age : 64
    Location : Nevada, USA

    David Forrest.. Empty Re: David Forrest..

    Post  Tom(ADMIN) Fri Nov 01, 2013 9:26 am

    Thanks David, it was just a thought...I originally was going to use one in the Skipjack and the other in the X craft, both using water pump systems, so I think I'll stick to Plan A.

    I'll use the "bad boy" for the Dragonfish....(bad boy? you're getting very cool, dude...)



    Richard
    david f
    david f
    AMS Treasurer


    Posts : 2412
    Join date : 2010-11-10
    Age : 74
    Location : Cumbria

    David Forrest.. Empty Re: David Forrest..

    Post  david f Sat Nov 02, 2013 10:57 am

    That sounds like a good plan, Richard.

    Sorry about the "bad boy" stuff - that Jamie and his recipes! (I am a "Hep Cat" at heart.)

    David
    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3026
    Join date : 2010-11-05
    Age : 64
    Location : Nevada, USA

    David Forrest.. Empty Re: David Forrest..

    Post  Tom(ADMIN) Sat Nov 02, 2013 11:02 am

    A "Hep Cat" eh? Good grief, you get worse!

    (far out, man...)
    nigele(ADMIN)2
    nigele(ADMIN)2
    AMS Chairman


    Posts : 1107
    Join date : 2010-11-06
    Age : 70
    Location : Braintree, Essex

    David Forrest.. Empty Re: David Forrest..

    Post  nigele(ADMIN)2 Sat Nov 02, 2013 12:13 pm

    Richard, ripmax extra 12 wont work at the voltage you are looking for,use the board out of an old servo as a 4.8 volt speed controller,take the board out remove servo motor, then connect servo motor leads to pump,take the red and black leads out of servo plug and run the back to the stand alone bec output side (4.8 volt) this take the load of the rx rail,plug the remaining white signal lead in to rx as normal, centre the pot on the servo board and jobs done it will now work as a two way speedo,if you only want one way trim the pot on the board and that should do it,or of course you could operate the valve of one side if you need to.

      Current date/time is Thu Dec 12, 2024 7:58 pm