2025
Hardware
medical device
SHOW HN2025
How HN took it
0 positive, 2 neutral or asking, 0 mixed, 5 critical, out of 7 comments about the project. Thread score -0.50.
Execution: 0 for, 3 againstDocs: 0 for, 1 againstPricing: 0 for, 1 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
Objections
Monophasic output considered less safe than biphasic; maker plans it for a V2
From 2 comments
Monophasic waveforms are generally considered less safe than biphasic waveforms. That's why many TENS units have an output stage based around a pulse transformer, so they can…
lambdaone on HNComing in a V2, semester just started again, so I have a little less time for it. Given that I also have some other projects on the way :)
autonomydriver on HN
Safety concerns and high danger of building a stimulator at home
From 1 comment
I tried to build some TENS device, but lost in "safety maze". I reverse engineered some existing device, there are TONS of safety measures. At least: current limiting resistor,…
zhouyisu on HN
Finger pad outputs wired together, contrary to the stated design
From 2 comments
I see > Each electrode channel is tied to a finger pad but the layout shows the finger pads are all tied together. What am I missing?
clnhlzmn on HNPoor wording, should mean that each finger has a dedicated output, but you are right, they are all tied together
autonomydriver on HN
Battery discharge cutoff voltage of 3.0V questioned
From 2 comments
> down to ~3.0V (discharged). That is NOT how one uses lithium batteries one foe snot want to go boom. Consider 3.6V as empty. Discharging them down to 3.0 can cause them to go…
dmitrygr on HN>3.6V is considered the nominal voltage, certainly not the low end cut off. This is not right (3.6v certainly is and can be cut off depending on device and battery). One thing…
shadowpho on HN
Commercial TENS units cost much less on Amazon
From 1 comment
This is cool, and all, but you can buy a TENS unit for $20.00 to $40.00 on Amazon.
NoSalt on HN
Questions
What do people use TENS devices for?
From 1 comment
What do people use this for?
arresin on HN
Alternatives named
Commercial TENS units sold on Amazon for $20 to $40
From 1 comment
This is cool, and all, but you can buy a TENS unit for $20.00 to $40.00 on Amazon.
NoSalt on HN