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    Bidirectional motor speed reduction circuit
    15 Posts ยท 7 Followers ยท 10 Photos ยท 14 Likes
    Began 6 months ago by
    Commodore
    United States
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    Latest Post 6 months ago by
    Commodore
    United States
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    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    John, I am quite familiar with most of the devices needed for RC vehicles. I have a few land vehicles (trucks and a half track) that were operated by model specific RC controllers pre-installed and converted to standard RC trans/rec.

    In this wide world one would think someone would have created a replacement for an inline the old resistor/rheostat for reducing bipolar voltage.

    Lew
    Florida โ›ฑ๏ธ, USA
    Lew Zee (LewsModelBoats.org)
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    JOHN
    Midshipman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    hi there Lew

    I have a feeling, my friend, you may have to bite the bullet with this one and alter the gearing to slow the crane down. I have been reading back through the posting and it does look like an 'all in one' circuit board that you are working with - very difficult to alter / tamper with.

    I suppose though the other alternative would be - to gut the old electronics out and replace with say a Futaba receiver. Then, you would obviously have to have speed controller for the tracks on one channel (forward and back of the actual movement of the crane) - then you would require the other 3 channels for the operation of the crane itself and they could be done with small, cheap, speed controllers.

    I have done this myself before on a model - but - for the winches on the crane, I used continuous rotating servos with drums attached for the cables & etc.

    The speed controllers I bought came from a local Company - and I will try and find the link - because it is a long time since I made this model. I can put the link on for you if I find it.

    John
    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    Thanks John. I've built this circuit for a "radar" motor speed controller. Unfortunately this will not work for this application as I need the input and output reversible.

    Lew
    Florida โ›ฑ๏ธ, USA
    Lew Zee (LewsModelBoats.org)
    JOHN
    Midshipman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    hi there

    If you are handy with a soldering iron, I suppose that you could construct this little voltage regulator. This would vary the speed of your motor.

    The only downside is that you only have 5 volts input which is on the low side for a lot of I.C control units.

    John
    NickD
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    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    What speed are you looking for and what does the motor operate?
    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    I doubt that this device would work for a bunch of reasons. Thanks anyway.

    Also, the output of the toy receiver is not variable. Just forward, stop, and reverse.

    Lew
    Florida โ›ฑ๏ธ ,USA
    Lew Zee (LewsModelBoats.org)
    JOHN
    Midshipman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    Hi ya Lew

    My main concern about what you are trying to do is - the power supply from that circuit board to the crane motor may already be a variable voltage supply, by a pulse with voltage gizmo on the circuit board. Similar to the way the circuitry in a speed controller works. It sends a pulse of signals. I suppose one way of testing would be to replace the motor with a 6 volt bulb. If the bulb dims as you move your lever on your control and it starts to flash, this will be an indication that it is a pulse system. If not, you may be able to replace or fit a little gizmo from China, which I have used quite often and it is a motor speed controller from 'Ali Express'.

    I will put a link on here as well, when I refind it for you.

    John


    https://www.aliexpress.com/item/4001051202952.html?spm=a2g0o.productlist.main.1.
    Len1
    Lieutenant
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    Doug, thanks for the info on servo speed reducers. I was not aware of them before.
    Len
    LEN1
    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    Thanks Doug. I was also wondering about these servos speed reducers and if that would answer my questions. (Crane was supplied by Marquis de Peking.)

    In the receiver output for channels, the red wire varies the voltage from (approximately) +5v to -5v. The black wire is common, and the white wire is sense.

    So the relationship between the red and black varies in that range. The DC motor doesn't recognize that or if the polarity on the terminals is reversed for a direction change.

    How about the output from the receiver I have? Is there a way of testing to see if the polarity is changing or is there a common on one wire and the other is going positive to negative?

    Lew
    Florida โ›ฑ๏ธ, USA
    Lew Zee (LewsModelBoats.org)
    RNinMunich
    Fleet Admiral
    ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    ๐Ÿ“ Bidirectional motor speed reduction circuit
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    PS:
    Lew, sorry to read of the pain scheme ๐Ÿค•๐Ÿ˜ญ of the crane.
    Was the crane model supplied by Marquis de Sade Models?๐Ÿ˜๐Ÿคฃ
    ๐Ÿ˜Ž
    Young at heart ๐Ÿ˜‰ Slightly older in other places.๐Ÿ˜Š Cheers Doug
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