Edit: the down votes are unclear. This is incredibly dangerous, although unlikely to actually cause harm, even if it is battery powered. Many people have killed themselves trying to measure their internal resistance with a multimeter. Once you break the skin all bets are off.
Power supplies for medical devices are extremely strongly controlled because it is easy for a device like this to kill.
Edit2: *internal* resistance means in your body, not holding on to the probes. It means sticking the probes under your skin.
Just to clear some stuff up, it’s battery powered. epilator circuit runs off 3 9v batteries in series, ammeter and voltmeter run off a separate supply, from a usb battery pack. Device delivers a voltage thats adjustable from 6v to 22v. Current sink (at probe) is adjustable from 0mA to 2mA. Supply is run through ecg electrode which is placed right next to the site I’m working on. A 555 timer is used to pulse the current sink. I’m using professional electrolysis probes, F4 shank stainless steel. Probe housing is made from a d-sub female crimp pin soldered to a wire and covered with a piece of heat shrink tubing. (F4 size probe fits snug into the socket). Here’s the schematic I threw together, if anybody cares: https://imgur.com/a/N2DY92z
To adjust current sink, toggle the test switch an turn the current knob, the value is displayed on the ammeter. To use, slide the test switch back. When the probe is inserted, you hit the trigger button and it delivers the current for a specified time. You can see how much it’s sinking. If it’s sinking less than what it was set for you can increase the voltage to overcome the resistance between the probe and the electrode. The setting that I use is 0.5mA at 15v. This will kill a pubic hair in 10 seconds without much discomfort if the probe is correctly inserted into the hair follicle.
For more information on what size probes to use for what hairs, and how much current to deliver over whatever time period you can search for a “units of lye” chart. I designed this circuit after doing about a month’s worth of research about how this kind of thing is done and I think it’s reasonably safe. My motivation for doing this is both to save money and avoid bullshit, over priced products, most of which are scams that don’t work.
* What kind of needles are you using, and where are you finding them? * How long of an exposure are you using? * How would you rate the pain level? * Have you tried/are you planning to try an RF or blended thermolysis method as well as the DC galvanic method? * Are you open to suggestions about future design iterations? (Feel free to say no, I saw your design and immediately started thinking about ALL THE POSSIBILITIES, but it’s your design and you’re within your rights to turn down feedback from a Random Dude on the Internet).
My wife has PCOS, and my best friend is mid-transition, and both have been talking about hair removal for a while now, so this design might be very helpful to us. Thanks for sharing!
Anyone here who would agree to be a test subject, raise your hand.
….
Anyone?
That wiring looks like when you just imported a schematic into the PCB editor.
I hope you’re either powering it from batteries or a medical-grade power supply.
You’re going to kill yourself.
Edit: the down votes are unclear. This is incredibly dangerous, although unlikely to actually cause harm, even if it is battery powered. Many people have killed themselves trying to measure their internal resistance with a multimeter. Once you break the skin all bets are off.
Power supplies for medical devices are extremely strongly controlled because it is easy for a device like this to kill.
Edit2: *internal* resistance means in your body, not holding on to the probes. It means sticking the probes under your skin.
Just to clear some stuff up, it’s battery powered. epilator circuit runs off 3 9v batteries in series, ammeter and voltmeter run off a separate supply, from a usb battery pack. Device delivers a voltage thats adjustable from 6v to 22v. Current sink (at probe) is adjustable from 0mA to 2mA. Supply is run through ecg electrode which is placed right next to the site I’m working on. A 555 timer is used to pulse the current sink. I’m using professional electrolysis probes, F4 shank stainless steel. Probe housing is made from a d-sub female crimp pin soldered to a wire and covered with a piece of heat shrink tubing. (F4 size probe fits snug into the socket). Here’s the schematic I threw together, if anybody cares: https://imgur.com/a/N2DY92z
To adjust current sink, toggle the test switch an turn the current knob, the value is displayed on the ammeter. To use, slide the test switch back. When the probe is inserted, you hit the trigger button and it delivers the current for a specified time. You can see how much it’s sinking. If it’s sinking less than what it was set for you can increase the voltage to overcome the resistance between the probe and the electrode. The setting that I use is 0.5mA at 15v. This will kill a pubic hair in 10 seconds without much discomfort if the probe is correctly inserted into the hair follicle.
For more information on what size probes to use for what hairs, and how much current to deliver over whatever time period you can search for a “units of lye” chart. I designed this circuit after doing about a month’s worth of research about how this kind of thing is done and I think it’s reasonably safe. My motivation for doing this is both to save money and avoid bullshit, over priced products, most of which are scams that don’t work.
Did you come up with the circuit design yourself?
My knob goes to 11.
So does it work?
Nice work! I have a few questions:
* What kind of needles are you using, and where are you finding them?
* How long of an exposure are you using?
* How would you rate the pain level?
* Have you tried/are you planning to try an RF or blended thermolysis method as well as the DC galvanic method?
* Are you open to suggestions about future design iterations? (Feel free to say no, I saw your design and immediately started thinking about ALL THE POSSIBILITIES, but it’s your design and you’re within your rights to turn down feedback from a Random Dude on the Internet).
My wife has PCOS, and my best friend is mid-transition, and both have been talking about hair removal for a while now, so this design might be very helpful to us. Thanks for sharing!
it seems like no1 is a chemist/physicist here
2mA is VERY small. 192970 Coulombs of electrons is necessary to liberate 2 grams of hydrogen from 18g of water
192 kCoulombs yeah. 3 years of continuous electrolysis to get 2 grams of hydrogen at 2mA.
great job! wish I get to make one myself one day. but daaaamn that wiring, jesus! 😀
Any updates on this project, How did it work, How are the results? Did you make any improvements?