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1. 08:28 PM - Re: Dual Control Stick Trim Switches Without Relays (Jeff Page)
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| Subject: | Re: Dual Control Stick Trim Switches Without Relays |
I see two restrictions to utilize this circuit:
The trim switches in your control stick would have to be not commonly
switched to ground. This might be a typical case, since it would half
the number of wires inside the control stick.
The trim switches would have to be capable of handling the trim motor
spikes. Unlike a relay, since the voltage polarity is reversed, the
usual diode protection for the switch could not be used. A
bi-directional device with a clamping voltage a little higher than bus
voltage might be desirable.
I think that is why the relay method is commonly used.
Jeff Page
Dream Aircraft Tundra #10
> Time: 06:36:24 AM PST US
> Subject: AeroElectric-List: Dual Control Stick Trim Switches Without Relays
> From: "user9253" <fransew@gmail.com>
>
> Joel Graber designed and posted a circuit on VansAirforce that
> controls a trim
> servo motor using
> Ray Allen G205 SPDT stick grip switches mounted on pilot and copilot
> control sticks.
> No relays are required. A PDF version can be download:
> http://tinyurl.com/Trim-Circuit
> Joel Graber has used this circuit in his RV-10 for over 600hrs.
> In case of a runaway trim caused by a stuck switch or suicidal
> copilot, the opposite
> direction
> button can be pressed and held until the fuse or breaker can be pulled.
> I do not know if anyone else has thought of this wiring scheme before or not,
> but I thought it both simple and ingenious. Even the Ray Allen
> company thinks
> that relays
> must be used for 2 control sticks.
> Joe
>
> --------
> Joe Gores
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