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Resolved Resolved by DJ Sures!

Disconnected When Add One More Servo?

I am working on InMoov hand project. The Software will disconnected the EZ-B 4/2 when I add more than 1 servo Motor.
Can anyone tell me the solution? Thanks.

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#7   — Edited
smattachai, how did you adjust the voltage down to 8.5 vdc? cem is correct, you don't want your servo's fed voltage that is too high. You can get batteries that will give you the 7.4 volts DC you are looking for, however now you are using a plug in AC to DC power converter. It is a little more complex to target a needed voltage and usually requires an additional device. What is usually used is a DC to DC  adjustable power converter rated above the current you will require. 

I'm using an adjustable voltage BIC's produced by Castle Creations for the different voltage needs of servos on my B9's arms. The BIC's are rated at 10 amps each and are switching style. Kinda expensive at $22 UDS each but I absolutely love them. They're tiny, very light weight and run cool. You can have a higher voltage power supply like 12vdc (rated above your amperage needs) and use these tiny BIC's to step down the voltage in .5 volt steps to what ever voltage you want. You program the wanted voltage through your computer. Here's a link to a lot of info on this BIC:
Castle Creation BIC's (out of stock)

You can get them on AMazon for around $25 USD each here:
Amazon CC 10 amp Bic's

Unfortunately you'll also have to buy one of CASTLE LINK's USB PROGRAMMING KITs to set the proper voltage. The BIC's come from the factory set at 5.1 vdc. They cost about $20 USD. The Software is free. Read about them and buy here:
Buy them on Amazon here:
Amazon CC Programming Kit

After stepping down the voltage from 12vdc to 6 or 7vdc as needed they easily handle the amp draw of my power hungry servos lifting up to 4 pounds while thay are moving fast.

Good luck and have fun!
I always think it’s real sci-fi for these inmoov builders. To have their humanoid robots standing above them. Incomplete. Looking and waiting for arms. Waiting to be finished. 

Probably feels cool - like a mad scientist. Inventing in a lab

You are all right, thanks to cem, Dave Schulpius and DJ Sures.

Cem, Right! i completely forgot about requirement of voltage of servo. thanks for remind me.
Dave, Thanks for your information sharing. I seem, I need to change switching power supply to convert AC to DC 12 v. for the 1st step, then regulated DC to DC (12 v. to 7.4 v). If I had understood.

DJ Sures, thanks for sharing idea and developing interesting Hardware and Software. I do hope to control more activities with your reliable micro-controller EZ-B V4/2 than MRL software. Looking forward to your cool product development!!!
Som, what 3d printer did you use?
@EzAug: I am using "Creality CR-10S". What is about you?
I don't have one yet, trying to decide which to purchase

Very nice work you do