Who is interested in a groupbuy of Mark Kelly's DC controller PCB and related parts

[ARAD]

and the last one

 

[Vinyl-Addict]

and the last one

Very nice job.

 

[Bas Horneman]

Bas - you should reconsider and complete the project.

I will one day 🙂



PS. Great job you did!

 

[YCLee]

I must have come in late. I am interested in the PCB, the pulley and the Maxon motor. Is this group buy still active or someone has some left over that I can take advantage of?
Many thanks.

 

[Algar_emi]

Thanks Mark for your help. Here the version 1.2 of my PCB.

 

[Algar_emi]

Hi MarK. Thanks for your help and usefull comments. Here most of the modifications that you suggested on your original schematic to make it work with my own motor. I modified the battery charger to accept the new 24V battery and change R4 to 1R2 (exact value still to confirm)

I'm on the road and I will need to validate the exact motor current when I'll be back. In the mean time, Mark can you validate my calculations for the L200C battery charger modified for the 24V battery?

L200C
Vout = Vref (1+R2/R1) where Vref = 2.770V
Io = Vpin5-Vpin2 / R3

Ver1.0 set for 12V Battery
values where R1=750R, R2=3K, R3=0.75

For 24V Battery
Typical float voltage (lead-acid) is 2.15 to 2.23V per cell, or 12.9 to 13.4V for a 12V Battery. So for a 24V battery, float voltage = 2.20 * 12 = 26.4V + 0.7V (D1 diode) = 27.1V

R2 = ((27.1V/2.770V) - 1) * 750R = 6587R (closest value 6.65K) = 27.3V

Q2 & Q8 are already mounted on a very good heatsink. I'll install small TO92 heatsinks on Q3 & Q4.

On my circuit, I will also to change the charger transformer and use an external 24V battery. My design already included the option to use an external battery, so I'm convered. My current transformer is a TE70033, 15V, 04A (parallel secondaries), or 30V, 0.233A (sec in serie). I'll keep the same transformer, but just modify the PCB to connect both secondaries in serie.

I guest I will also need to modify the LED's indicator Zener to accept the new 24V working voltage 🙄

 

[Algar_emi]

OPA2777 Supply running at 24V

Hi Mark. One problem may be to use the OPA2777 with the new 24V supply voltage. This op-amp is specified for a maximum of +/-18V supply range. Will it work with a supply of 0V and 24V?

 

[gtrmkr]

I can't believe I missed this group buy. Any chance any full kit, or even parts of it might still be available?

If not, any guidance on where to start collecting the design info and needed hardware?

Thanks very much!

I can't believe I missed this group buy.

Jim

 

[Mark Kelly]

Re: OPA2777 Supply running at 24V

Hi Mark. One problem may be to use the OPA2777 with the new 24V supply voltage. This op-amp is specified for a maximum of +/-18V supply range. Will it work with a supply of 0V and 24V?

Yes, because the opamp sits between the rails so at +24V / ground it is seeing +/- 12 on its rails (the opamp voltage spec allows for swinging to rails).

BTW I assume 2777 is a typo.

 

[Algar_emi]

Yes, it is a typo error, should be OPA2277. Thanks Mark for the reply.

 

[rclourenco]

Re: Re: OPA2777 Supply running at 24V

Hi Mike,

Just a new guy entering the block, do you still sell PCB's for the motor controller? if so is it possible to sell me one?

please mail me to rui.lourenco@fortislease.com

thanks

 

[kraljmatjaz]

Hello Mr.Kelly,

one more late post. Maybe you still have the pcb's?

Please contact me on :
mcotar@hotmail.com

Thank you a lot
best regards,
Boris

 

[Algar_emi]

Just checking, certainly for nothing, but just in case if someone didn't use his Maxon Motor, I need want and want to buy it.

Thanks.

 

[Algar_emi]

Also if I cannot get any motor, I would like to start a new group buy for 5 motors minimum. I can supply my own version of Mark Kelly PCB also if you need it. I'm waiting to see if there is any interest. Please email me.

By the way Mark Kelly just posted his PCB, so I can make his PCB too if you prefer...

 

[gtrmkr]

controller

I'm interested in both the controller and a motor, so count me in. Thanks for being willing to organize this!

James

 

[kraljmatjaz]

Hello,
i would be inteersted in both the Kelly controller (the original, if you could make the pcb) and the motor.
thanks a lot.
Boris

 

[webby]

Hi All,
I still havent managed to find all the components here in the uk. I already have the PCB's, pulley and motor.
So i would like to sign up for the group buy to.
Cheers
Ian

 

[Sean Henderson]

Wish to buy the MK PCB's and a Motor

Count me in on the group buy for the Mark Kelly version of the PCB and a Motor.

Address is:

Sean Henderson
1032 Misty Court
Harrisonburg, VA 22801

Thanks for pulling this together!

Sean

 

[kilowattski]

Wake up Gentlemen........

If you guys want motors, pulleys and Mark Kelly Motor Controller PCB's you better get your butts in gear and go to the new group buy thread and sign up quickly. There is only two weeks left and posting your wants in this thread won't get it done for you.

Post what you want in this thread:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=109934&perpage=25&pagenumber=1

 

[Algar_emi]

Guys, we are getting close the 20 motors. I will probably close the group buy then. Let's see if we can get there. Please hurry if you are interested in this year group buy. It may not be an other one before a long time...