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Is there a way to connect the tape player of an omnibot to the EZ-B or battery holder?  It'd be awesome to have that retro piece of technology still operational amidst all the brand-spanking-new tech that's been retro-fitted into the body without having to hunt down (and figure out how to reconnect it to) one of those bulky battery packs it originally came with.  I found a nice schematic of the robot from its user manual...

[color=#111111][size=3][font=Verdana, Arial, Helvetica, sans-serif]http://www.theoldrobots.com/book23/ros15.JPG[/font][/size][/color]

[color=#111111][size=3][font=Verdana, Arial, Helvetica, sans-serif]...but it's not terribly clear as to how it hooked up to its power source.[/font][/size][/color]



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Synthiam
#1   — Edited
If you want it to actually work, it would need to be a stand alone system which you can simply apply power to. If you need to try and read the tape, play it through the ez-b and so on, probably not going to happen.

I would imagine a lipo could supply the needed current, just not sure on the voltage.
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Synthiam
#2  
Share the motor wires with the hbridge and cassette pcb. Simply don’t disconnect the existing motor wires and tap into them instead. 

That’ll leave both operational and have a toggle switch between their power. Because you wouldn’t want both on at the same time, as it’ll cause a short. One could be grounding the line while the other is outputting positive.
#3  
My Alexa project uses a highly modified Omnibot 2000. The robot has all of its original functions including the tape deck.  The right arm still has the same remote functions. I modified left arm with servos connected to ezb. The drive base motors work as original . You can connect the motors to hbridge without disconnect anything internally. Use the auxiliary rca rear connectors to connect directly to the motors. There are 2 slides switches on panel to that. If you want to switch motor connection via ezb,you could use 2 relay boards in place of slide switches. The entire robot  uses (2) 6 volt sla batteries. One for the omnibot and one for ezb. You can see my project in my profile.
#4  
"[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]Share the motor wires with the hbridge and cassette pcb. Simply don’t disconnect the existing motor wires and tap into them instead."

[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]To make sure I'm following what you're saying correctly, I can take one of your extension cables...[/font]
[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]https://www.ez-robot.com/Shop/AccessoriesDetails.aspx?prevCat=103&productNumber=8[/font][/font]
[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]...and put one end into the EZ-B, and then wire it to where the cassette player would receive power?[/font][/font][/font][/font][/font]

[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]"[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]That’ll leave both operational and have a toggle switch between their power. Because you wouldn’t want both on at the same time, as it’ll cause a short. One could be grounding the line while the other is outputting positive."[/font][/font][/font][/font][/font][/font]

[font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"][color=#442e5f][size=3][font=OpenSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"]Actually, having both the EZ-B and the tape player on at the same time was EXACTLY what I was trying to accomplish.  That wouldn't work?  Also, could you explain further about the toggle switch, or grounding vs. outputting positive?  (Wow, I am SO wet behind the ears here...)[/font][/size][/color][/font][/font][/font][/font][/font][/font]