My friend has been living with an old flip-phone with a crack in the still readable screen and just basic phone service, so I thought it would be good to get him a used phone, but something a few generations newer. I got a used Samsung Zeal, which is (I call it) a flip-flop phone. It has a flip-up lid, which displays a phone number pad. But if the lid is flopped sideways, the keyboard is displayed. It’s pretty cool.<\/p>\n
But the charger that came with it has a special Samsung plug that only fits the connector on the phone. I can’t use the standard micro USB charger cord. The other end is a 120 VAC to 5 VDC converter, not a USB connector.<\/p>\n
I ordered some ‘lipstick’ phone chargers. They are a round case with a lithium rechargeable cell and the circuitry inside and a USB connector to output the 5 VDC to the cell phone. The problem is the phone’s cable needs to plug into 120 VAC, not 5 VDC. I can’t replace the cord because it has the special Samsung connector.<\/p>\n
So what I need is to go from 5 VDC to 120 VAC. I think if I used a 120 VAC to 6.3 VAC center tapped filament transformer with a power transistor, it might be able to put out 120 VAC at 10 watts. The frequency is probably not critical as long as it’s somewhere in the audio range.<\/p>\n
I was thinking of another solution. I could tap into the plus and minus wires of the special cable. I could then solder a 1N5817 Schottky diode and a cable with a USB connector on the end so it can be plugged into the ‘lipstick’ or any other charger. I may not have to have the diode at all, depending on the output circuit of the charger.<\/p>\n","protected":false},"excerpt":{"rendered":"
My friend has been living with an old flip-phone with a crack in the still readable screen and just basic phone service, so I thought it would be good to get him a used phone, but something a few generations newer. I got a used Samsung Zeal, which is (I call it) a flip-flop phone. <\/p>\n (Read More…)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10315","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/10315","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10315"}],"version-history":[{"count":4,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/10315\/revisions"}],"predecessor-version":[{"id":10319,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/10315\/revisions\/10319"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10315"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10315"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}