speed controller?

[captainslogParticipant @captainslog]

Dug this out of "a box" cleaning my workshop/was a spare bedroom place. It looks like a speed controller and probably came from my uncles skyleader days. lead pins on plug are round 3 wires to recv. 4 flat pins for batt/motor connections. 2 tiny pots to adjust for neutral point and throw. unit measures 3" long x 2" wide and 1 1/4" deep including cooling fins. Has any 1 got a clue as to its capailities/amp ratings/voltage max etc? or how i test to find out?

Edited By captainslog on 19/09/2012 06:15:46

Edited By captainslog on 19/09/2012 06:17:26

[captainslogParticipant @captainslog]

[captainslogParticipant @captainslog]

Edited By Colin Bishop, Website Editor on 19/09/2012 17:41:29

[captainslogParticipant @captainslog]

dont know what happened there, one minute i had a posting with fotos, then i had a posting no fotos. checked my albums and the album had dissapeared, beloaded a new album and the old album is back as well but no fotos got a new album now with fotos but my old album name is there with no fotos.but my thread is back with new fotos as a new posting under the old posting .ffs iff you can understand that lot your better than me cos i just read it and it dont make much sense lol

[captainslogParticipant @captainslog]

the jist of it all is what is it and is david wiggins about or even glynn guest cos i reckon they would know

[TelstarParticipant @telstar]

Aye aye Captain(slog)

I have a little info on MacGregor MR15P speed controller circa 1973/74. The two pots are Neutral and Throw, ie off position and full speed. they have no BEC etc, the esc is powered from the RX supply.

The output, ie the bit that runs the motor, is essentially seperate from the RX, the 4 flat pins being battery in motor out. The main power transistor controlling the motor is (I think) a 1N6103 and could handle 15A at 24V Max Reversing is by an internal relay, and the motor connections go to the relay,

The + battery connection also connects to the relay, while the -ve is common with the RX -ve supply.

Hope this throws some light on things

Cheers Tom

[captainslogParticipant @captainslog]

thanks tom, bit unclear on 1 point. if th esc is powered by the receiver battery why are there two pins for a main batery supply? i`m not up on electronics but i would think it works on the same principal as the hitech sp 6/10 esc. do you think it would be ok for a 650/700 motor and can it be used i conjunction with modern radio equipment after changing the plugs of course    

                    thanks keith

Edited By captainslog on 22/09/2012 04:07:13

[TelstarParticipant @telstar]

Hi Keith On modern Esc's the main part of the electronics is powered from the motor battery by a regulator in the Esc (this also gives B E C&nbsp This does away with the need for a RX battery. On the MR15P this is not so. This unit is run from the RX supply. The Output of the control is mostly seperated from the RX battery, and as such needs a seperate supply to feed the motor. It should be compatable with any standard RC system, (They worked with Futaba Digimax, and I don't think the standard has changed)

If you connected it to a RC system, with NO motor or motor battery connected, RX and RX battery only When you move the stick from ahead to astern you should get a slight click as the relay changes over.

I used this type of Esc on 12V with a Hectoperm motor, and with a slight mod. with a AC Delco 24V wound field motor (came from war surplus shop, ex bombsight compensator, ) .

I don't have a MacGregor Esc, but I do have a MacGregor single channel RC combo complete with Servo. No use these days, not even crystal controlled.

The choice of motor is dependant on the load current taken by the motor, remember the Esc has a MAX current carrying capacity of 15A

Cheers Tom

[Malcolm FraryParticipant @malcolmfrary95515]

thanks tom, bit unclear on 1 point. if th esc is powered by the receiver battery why are there two pins for a main batery supply? i`m not up on electronics but i would think it works on the same principal as the hitech sp 6/10 esc.

Any ESC has two main parts. The control part, which runs off the same supply as the receiver, and the output part, which runs off the main power battery. Some ESCs have an extra part, the BEC, which takes the main battery supply and reduces it to a suitable voltage for the control part. Since this can also supply regulated power to the rest of the control components, it often gets used for that job.

From what I remember of the Hitech, it needed a separate supply for the receiver and its control part.

Enlarging on Tom's mention of the relay – always ensure that the relay only operates for reverse. If used for forward (i.e. with the TX N/R in "R" to give forward with stick forward), the relay will be operated and flattening your RX battery rapidly. After a while, when the RX battery voltage drops to a level when the relay won't operate, you wind up with a boat that will only run in reverse.

[captainslogParticipant @captainslog]

I just realised tom, I wont need to change the plug for the receiver. I have a skyleader 27 meg. the receiver on that takes round pins. would all look nice in veron vosper RTTL. thats iff the controller is compatible. what do you think? a complete vintage working model? apart from the motor which is a 540

[TelstarParticipant @telstar]

If The plug and socket are wired the same, I don't see any problem.

Altho there are several different specs for 540 motors, they seem to be within the ESc capabilaty.

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