Not sure if we are getting wires crossed. The $102 price was for the Rpi hat to
arduino shield adapter
IanV
On Monday, 20 March 2017, 17:01, Tomasz Kowalczyk <[email protected]>
wrote:
Yeah, but this is costly due to custom transformer used. I'd prefer a 12V
supply and cheap NE555 converter or 5V + voltage doublers, as this is just
cheaper than those 'ready to use' modules from ebay. On USB you are heavily
limited with current anyway, so the clock has to be multiplexed or driven with
<100% duty cycle. And I see no other point in using 5V power supply than making
USB powered clock. USB 2.0 standard gives 500mA, which will be not enough to
really use that converter fully :) Of course, cell phone chargers provide more
current, but I think that if a clock is designed to have USB type supply, it
should be possible to drive directly from a PC.The only reason I see for going
with transformer converters is making a battery powered clock. But then I'd
recommend using flash lamp cap charging transformers - generally very small and
made exactly for converting battery voltages to high voltages.
W dniu poniedziałek, 20 marca 2017 16:42:49 UTC+1 użytkownik Alic napisał:
The eBay seller vfdclock also sells many different 5V to 170V or higher
supplies (his eBay store is closed for a few days right now)
:http://www.ebay.com/itm/ 131846790948?_trksid=p2060353.
m1438.l2649&ssPageName=STRK% 3AMEBIDX%3AIThttp://www.ebay.com/sch/
vfdclock/m.html?_nkw=&_armrs= 1&_ipg=&_from=
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