Dome Drive Schematic

Posted on Feb 5, 2014

A couple of changes on the dead band and Pulse Stretcher resistors, and the Position feedback potentiometer has been hacked around to function as a `zero the speed` or `center your transmitter sticks`. The rest is just the addition is a fairly traditional PNP-NPN H-bridge to handle the higher currents of the large motor. So all we have to do is change it back to

Dome Drive Schematic
Click here to download the full size of the above Circuit.

function as a servo and stick a potentiometer in the middle of R2 ½s dome rotation mechanism and now we have a giant RC servo. But Oatley sells a giant RC servo kit. Why not just use that instead Sure you can. And it would work no problem if you wanted R2 ½s head to rotate a maximum of about 70-90 degrees. 35-45 degrees or so each side of center. If that is ok for your needs then just purchase the K165B kit, put it together and you ½re done. . However, other than very reduced dome rotation, the old kit has a much different H-bridge design that is not as efficient as the forward reverse kit. And unlike the forward/reverse kit you cannot add the additional Mosfet`s to be handle larger current motors or amperage. This kits H-bridge design uses a couple of very large resistors for the Mosfet gate drive, which significantly turns batteries quickly into heat. See Figure 5. So other options What do I want the dome to do I want at least 360 degrees of rotation. Problem is that standard potentiometers don ½t turn that far. Generally somewhere between 270-330 degrees and the circuit limits them down to half of that. So we have a number of options. The easiest is a multiturn potentiometer. Generally these larger panel mount devices come in a 10-turn style where you have to turn them 10 complete revolutions to go the full swing of the resistance. Not a bad option. I connect one on R2 and now I get 2. 5 revolutions of the dome from the...

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