I started out using a single pole, single throw pushbutton switch from an old mouse for the switch on my Joule Thief with timeout circuit.\u00a0 But I changed it to a double throw switch.\u00a0 It’s simple to use the single throw switch to charge or discharge the timing capacitor and start the timeout.\u00a0 But if the switch is unprotected and gets activated accidentally, then it will never allow timeout and the battery will be wasted and eventually go dead.<\/p>\n
To prevent this, I changed the switch so that if it is pressed, the capacitor is charged but the circuit is not activated.\u00a0 When the switch is released, the capacitor is then connected to the circuit and the timeout begins.\u00a0 If the switch is accidently pressed and held, the circuit will never be activated and the battery will not be discharged.<\/p>\n
The pushbutton switch comes from an old ball mouse and already has the double throw terminal.\u00a0 The NC or normally closed terminal connects to the circuit, the NO or normally open terminal connects to the charging or discharging voltage, and the common terminal connects to the capacitor.\u00a0 This is all a simple matter of rewiring the switch, and does not require any additional parts.<\/p>\n
This switching method applies to any battery operated circuit where there is a possibility of accidental discharge.<\/p>\n
Back to experimenting…<\/p>\n","protected":false},"excerpt":{"rendered":"
I started out using a single pole, single throw pushbutton switch from an old mouse for the switch on my Joule Thief with timeout circuit.\u00a0 But I changed it to a double throw switch.\u00a0 It’s simple to use the single throw switch to charge or discharge the timing capacitor and start the timeout.\u00a0 But if <\/p>\n (Read More…)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,12],"tags":[],"class_list":["post-4905","post","type-post","status-publish","format-standard","hentry","category-flashlight","category-led"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4905","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=4905"}],"version-history":[{"count":7,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4905\/revisions"}],"predecessor-version":[{"id":4939,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4905\/revisions\/4939"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}