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Simple DC Power Supply

bornbkjp

Jun 21, 2013
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Does this look right I'm new at this . I need a simple DC power supply to run a tattoo machine which is no more that a coil door bell but I need Smooth DC . The machine works well just want to know if it looks right would it help to add another Capacitor or anything else. I used a 12.5 V 3 amp transformer machines never going more then 1 amp is it OK to use the 3 amp transformer .. Thank you guys for all the help !!!
 

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davenn

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hi there
welcome to the forums :)

yup that looks cool :)

do you actually know how much current the tattoo machine draws ?
1A? 2A or whatever ?

Dave
 

Number

Jun 9, 2013
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If you want smooth DC consider a voltage regulator. I'm not sure if the large capacitor is more helpful than having several smaller capacitors or not.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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It might work. The voltage will vary somewhat with load.

I have no real experience with the power requirements of a tattoo machine or the effect when the power supplied has ripple or sags under load.

Perhaps you could experiment with a leg of pork first? (What do you practice on???)
 

davenn

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If you want smooth DC consider a voltage regulator. I'm not sure if the large capacitor is more helpful than having several smaller capacitors or not.

those tattoo vibrator units dont need DC thats overly smooth .... since they in their action are already chopping the DC to shreads LOL

Dave
 

bornbkjp

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A machine might draw up to 1.5 amp I was told to have a power supply of at least 2amps
its just two coils like the old door bells. I just wanted to keep it simple do I need to add a bleed resistor for the cap. Never done this before just guess work..Thanks for the help.
 

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davenn

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you could stick a say 6.8k resistor across the cap if you wanted to
dont think its really necessary tho
The voltage nor the value of the cap is high
bleeder resistors are often used in power supplies where the cap value may be 10,000 uF or more and the voltage across them 20V or more

Dave
 
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Number

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those tattoo vibrator units dont need DC thats overly smooth .... since they in their action are already chopping the DC to shreads LOL

Dave

Oh true. That makes more sense. I don't see how having one would do any harm, but if it's irrelevant then I wouldn't use one. :cool:
 

bornbkjp

Jun 21, 2013
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If I wanted to bring it down to 15 volts could I add a resistor and where and what kind, ohms , tolerance and watts .
 
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(*steve*)

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Unfortunately a simple series resistor is not going to reduce the voltage in the way that you want -- unless the tattoo vibrator represents a load that doesn't vary (with load typically).
 

bornbkjp

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Unfortunately a simple series resistor is not going to reduce the voltage in the way that you want -- unless the tattoo vibrator represents a load that doesn't vary (with load typically).

What does the 2.2k resistor do in this circuit ? and on the project I built can I use a larger cap then 4700uf to filter the dc some more ,was told in the old days they used car batteries, being a cleaner source of DC for running tattoo machines. also I am using a 3amp transformer in one I made, machines use just about one amp is the 3amp transformer I used Ok
 

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(*steve*)

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The 2k2 resistor provides a small load which discharges the capacitor when the power is off. It probably does little else.
 

bornbkjp

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Unfortunately a simple series resistor is not going to reduce the voltage in the way that you want -- unless the tattoo vibrator represents a load that doesn't vary (with load typically).




Is there a way to do it with a resistor and diode
 

(*steve*)

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Not in any way that would be effective unless the load is substantially resistive.
 
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