12 V lithium battery power supply with motor speed controller

[Texastimdavis]

My most recent project has 1 problem that I can't figure out. I made a power supply for a tattoo machine. I am using a 12v battery pack that runs to a motor speed controller and then a footswitch and on to the machine. I have a volt meter wired to the output side of the controller. When I adjust my voltage to lets just say 6.5v, when i step on the footswitch the machine runs but my voltage goes up to around 8.5v. When I let off the switch it goes back to 6.5. Has anyone seen this or know how to fix it? Thanks for the help in advance.

 

[Bluejets]

Show your circuit diagram ( not fritzing).

 

[Texastimdavis]

 

[Texastimdavis]

Not the best drawing. Sorry.

 

[Alec_t]

Perhaps the motor controller needs to detect current drawn by the motor in order to regulate the voltage, and just goes into a standby state when the current stops? Or perhaps the controller is controlling current rather than voltage, and needs to increase voltage when the motor runs?

 

[Bluejets]

You are trying to measure pwm voltage with a dc voltmeter which will not make sense.

 

[73's de Edd]

Ehhhhhhhhh . . . . . . . . . Tejano Tim !

Much better feedback intel . . . with your comeback !
Why not try this ?
Where you now have that line feeding into the metering . . . . insert this gnats' brain circuitry.

The entering pulse train will progressively accumulate a charge build up in the cap and give you a DC voltage read out.
The shunting resistor is there to speedily drop down the voltage level readout , if you should start backing down on the speed control.
The end situation is that you will now have a DC monitorable voltage produced in relation to the motor speed.
Then, you are given a capability of repeatable setability . . . . . . . . while the blood is a oozing.
With you having the switch wired in in that manner, there will be a need to have the switch closed in order to have an actual motor loaded reading.

Thaaaaaassssit . . . .


73's de Edd . . . . .

Have you paid your taxes......??
Git 'er done . . . . . there are 12 million illegal aliens that are depending on us.
.

 

[danadak]

Have you paid your taxes......??
Git 'er done . . . . . there are 12 million illegal aliens that are depending on us.

Gee and I was thinking all the US companies, ,many who get paid with Federal Corporate
welfare and pay no taxes a whopping problem. Or the effective tax rate applied to US
citizens is > 2x that of corporations.....or the corporate bailouts, no bailouts for the average
US citizen, might just be a 1000000X sized problem than some people who will come here
and pick our lettuce (fruits and veggies, obscene working conditions in no small # of cases),
clean our crevasse in old age, and do the work an entitled nation seems to shun. Me and my Mom
cleaned up a lot of .hitholes, many nasty gross pig pen spills and messes, made a lot of beds back
in the day.

You talking about those folks ?

 

[73's de Edd]

Looks like that is some Tee Shirt signage that should have never had the ink meet the silk screen press.
My apologies and MEGA ! KUDOS to U and MOM . . . . . . Keep on Truckin'.