[FARC] Voltage booster?

[m.e.whitmore at comcast.net]

Phil,

This is a "blocking oscillator" and has been in use for
many decades for cheap and dirty voltage step up.

The schematic is poorly drawn so I can't tell if the connection
on the toroid is a center tap or if the windings change 
direction. If the phasing of the 4t winding is not correct, then
the transistor will not turn on when you first apply the +1.5
volts.

----- Original Message -----
From: "Philip Karras" <ke3fl at yahoo.com>
To: "ccarc" <k3pzn-list at mailman.qth.net>, "Mid Atlantic" <madxra at madxra.org>, "Frederick AmateurRadioClub" <farc at mailman.qth.net>
Sent: Monday, December 30, 2013 6:49:15 AM
Subject: [FARC] Voltage booster?

Has anyone built one of these? I've been trying but have yet to get it working. It such a simple circuit I can't believe I can't get it working or figure out what I'm doing wrong!

See the Instructable called, "Making A Simple Joule Thief (made easy), by ASCAS" : (They call this circuit a "Joule Thief" because you seem the steal energy from a "dead" battery)
http://www.instructables.com/id/Making-A-Simple-Joule-Thief-made-easy/

Any ideas about how to get this to work would be appreciated.

I'm using a 3-Volt white LED, and green core from a dead CFL, and about 20 turns of double wire.

Another I've come across is the Supper Joule Thief, "Make a SUPER Joule Thief Light! by clevelandstorms" at
http://www.instructables.com/id/Make-a-SUPER-Joule-Thief-Light/

Perhaps I should give that one a try instead.

73 de KE3FL,
Phil
AEC Carroll County
OES, ORS, & VE
http://cs.yrex.com/ke3fl
Karras' Corner: http://blog.solidsignal.com/content.php/1005-karras-corner
______________________________________________________________
FARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/farc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:FARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html