This is a multi-part message in MIME format. ------=_NextPart_000_029F_01C5120B.F171BB70 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit > A web search on "Joule Thief" now turns up the site below selling > kits of a different circuit. > http://www.joulethief.com/ Looks worth playing with. Essentially a classic 2 transistor multivibrator. Single non tapped inductor is nice. Compare with my circuit posted some years ago - see below for similarities and differences. Mine is based on many decades old lamp flasher circuit which did not use an inductor. Presumably it has been "invented" zillions of times by others (although i have never seen it). Add a resistor in series with C as required/desired.) . RM ------=_NextPart_000_029F_01C5120B.F171BB70 Content-Type: image/gif; name="led1cell2.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="led1cell2.gif" R0lGODlhuQC8AIAAAAAAAP///yH5BAAAAAAALAAAAAC5ALwAAAL/jI+py+0Po5y02ouz3rz7D4bi SJbmiabqyrbuC8fyTNf2jef6zvf+DwwyACIAMWGMHJHGpKFZWTqkQiX1cw1kkYvscTusjsBM59OM 8ELUiiWZe0Zrqe40uvmG5bXdw5U91SVX94Dnd5gGx/eEuOh4s+dlqJhY2NfWGMa4ednoNvmoE9lJ mqlJiZhHGFqZKAUoKjcE5UdbSydbZob3uTe3O/vXZusrZnyMnKy8zNzs/AwdLT1NXW19jZ2tvc1d U9x9/Q1OLT4uXW7+LGurnovBjswLLc9Bn8yLn6+/z9/v/w8woL14oJoNzHDwGDyD7i4sjEcuBLod E39UPMXsYg+N/5iccaQoUR1CeOwK/rLzUIIkYZZQxdm1ruEYhJ5McVrVygLLRzI52WS16NVPEhVX vYE1VEnHUKqW5qzp9ETRkg1yIb2FzyVOoFoF0bH5cUJRqFVdskp58iyfry2f+iT7FsXYmz+FkuqJ suPOsmbZsGUxddCdkia/lCPyB3HeQLp6wcSFtshGh0l1igRp2e27yznQXaXsUZTXnGCKCYyMGVKw W3HNBgOoEEfpx3i5evUnJp+3qk6yrqHwz7VqzS3I0NL9Wyy/Up2FrzCexLdS4Pr4pm4NuFB01My1 J4QTFovzFEe3b45icrXs8XK9X/RcO+3wyu291wO9hvtIwVv+vv9QFR9jr223XHFkIRWeelGNtkF5 vfWD3UytIWjCdwBy5Flycj3UH3sanAZhg/gJWCFQpXm4n1X5YTgiYwmC55x/ZSw4hTsX3peZFS+2 4hiFnbwizonuiZjjis0RJ6RY1vGmGE1F1higCjImFSSJDE6EZUauJamSlcNs1WWLsSFpSpVLMhjh mUouMyVri4Wp5ptp0gjnPSh+2Baa9BE3nTJthpTnjHTe2V1uhJ7npZuD7pmooXyKp6Gghc4ZKUSP euDLSo2yyOahYsbZJ6OVjikqnmsWGdaOBl7agZmZhadqdqziSJ1DCcb6nKdPKqfci7hKqWsUHzZ0 HKB+SlfCR/v/BAsqqTqC2axkIPwqa5jQYiSVsVqS+EWp1M4KHGcYdUtpqbRiKm5jm1w7qbSQGpQn ubYtqm2r6Tolr2m5TutRgPmeKpVVUcp3T3qasEsvpoUZPCCbIILycMQST4xcwfoF5S15C1/8y8Cx 6OsIyBtqSt235IUbMsAxZBjamggzy++udrqcMQ0sw0tzuTpnK7Ol1tY8w83b/qwzx8l+6vOzjH5X Lco4B2z0GIfdK3XURAnb8sjzhdopsOvV2fXJX3Pt575bB1q212c3+qXJSEu4drSSHim2Dd+Y5rHa 9e3mdEtu94xexTtXOPWoou3H5OA8q9xu3Fb0OjZKAim+sk6H/+V9dGOwOco40XyT/RoPdyM6b9NQ qoT53oaT/TfbkkeS+uJoE0xnqnJfyHAqooNO+6PKzuL6S0yX/nmzKTVF5KS4C25u5bPH0Tjlg0qy YoHNOx/tQiKTLhx0wTnbLkl9v23cgLgZU/7p179XUGSJnYZ+8MS8Lfvz4I9XLP0lgp129FC895/O JY09ueNf3VaHPhsZKXlm411uDHYjBh7QgVWg2PAEKDXAVRCCCzRVAym4wQ7ZR4ITtN+EIKYi7CWO hCW8XXfkdQYZRNCDppPfC8sUtCE5yQXbe+EgcChD+8yFhxic0I9gZi/1ZSmABtSMXxKmui+tTw/j a1uPFIVFJv8qiHhI5B4CpzGbP0WvCIXTRhiXkr4agjAIJPmhng5BLC1WMX50eQvJ2jZGuM2Rc1e5 W3papytAumsv4BKcIMHVxRw2qTJ4m18QNchGO+anV4tUYRGFEB2slAdyNtPfNtCSvxxCEhzLQuT+ sJYOL8rxkqkMnt5Y2UpsUXGUscxj/ZpYS1e28Iu5tOUp9+iDjUlumJo04QdxOZk6muiGK1zZwKwm ypQl6jPCcybHLvgxuwhiGOGzoDe9yUf6+IhJsWtQAdVVwQMxc0/QnFbeDjks/hDzJVCEZy+JeM9s 2DOfx+TnOfwZDoBaY58CrUfECorQhCp0ocKzHkMfCtGItrIXlBKtqEUvasZyYnSjHO2oRz8K0pDS oAAAOw== ------=_NextPart_000_029F_01C5120B.F171BB70 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ------=_NextPart_000_029F_01C5120B.F171BB70--