Search found 1321 matches

by ag123
Sat Mar 16, 2019 3:25 pm
Forum: Off topic
Topic: low cost - rather low power mosfets
Replies: 9
Views: 229

Re: low cost - rather low power mosfets

the formulas for buck converters is 'surprisingly simple', D = Vo / Vi where D is the duty cycle i think this is based on 'steady state', basically non-fluctuating power draw https://en.wikipedia.org/wiki/Buck_converter if you have power draws that goes up and down like a bungee jump, stm32 may not ...
by ag123
Fri Mar 15, 2019 8:16 am
Forum: Projects
Topic: WWVB timecode from blue pill
Replies: 19
Views: 337

Re: WWVB timecode from blue pill

as the asian govts don't really believe in time signal stations, i'd either need to use the noisy short wave radios or gps to get 'NIST atomic' accuracy, so most of the time i made do and simply sync my pc to NTP and then try to sync my bp/mm rtc to my pc once in a while. unfortunately my cheap 32k ...
by ag123
Fri Mar 15, 2019 5:42 am
Forum: General discussion
Topic: Another thread about HardWire I2C freeze
Replies: 4
Views: 194

Re: Another thread about HardWire I2C freeze

this is a cool workaround :)
by ag123
Fri Mar 15, 2019 5:30 am
Forum: Projects
Topic: WWVB timecode from blue pill
Replies: 19
Views: 337

Re: WWVB timecode from blue pill

cool project from ray :D
by ag123
Fri Mar 15, 2019 5:25 am
Forum: Projects
Topic: Square root not working
Replies: 8
Views: 102

Re: Square root not working

try to use float
by ag123
Fri Mar 15, 2019 5:08 am
Forum: Off topic
Topic: low cost - rather low power mosfets
Replies: 9
Views: 229

Re: low cost - rather low power mosfets

thanks, but a guess is that as buck converters basically use the inductor to store and release energy, a larger inductor bigger L may help to smooth large current swings. but i think you are right about the responsiveness of regulation to changes. nevertheless, i'd think it is fun to try an experime...
by ag123
Thu Mar 14, 2019 8:25 pm
Forum: Projects
Topic: WWVB timecode from blue pill
Replies: 19
Views: 337

Re: WWVB timecode from blue pill

the chip scale atomic clock evaluation kit is kind of expensive $928.75
https://www.digikey.com/products/en?mpa ... 000&v=1522
an irony is that it actually cost less than those luxury mechanical watches
:lol:
by ag123
Thu Mar 14, 2019 7:55 pm
Forum: Projects
Topic: WWVB timecode from blue pill
Replies: 19
Views: 337

Re: WWVB timecode from blue pill

i got too curious after reading about these radio clocks synced to atomic clocks as it turns out science and electronics advances has come so far today that it goes from this atomic clock https://www.nist.gov/news-events/news/2013/08/nist-ytterbium-atomic-clocks-set-record-stability https://www.nist...
by ag123
Thu Mar 14, 2019 5:28 pm
Forum: Off topic
Topic: low cost - rather low power mosfets
Replies: 9
Views: 229

Re: low cost - rather low power mosfets

btw i had to agree with @misfet that 5 amps on sot23 seemed too large to be true, hence 'bending the brain' but at 1c - 1.5c each, it is probably worth experimenting, either way through hole bjt npn or pnp i doubt it is possible to even go anything higher than one amp. a tip120 takes a TO-220 packag...