I would go the variable speed drill direction. Lee, from my experience SCRs have a tendency to false trigger on noise. I was burn a few times. I remember using a GE SCR for an alarm circuit. I could not get it from false triggering. I talked to the SCR designer at GE and he never could come up with an answer. I redesigned using transistors and NAND gate chip and everything was OK. Another possible choose is to look on the web for a motor speed controller kit. I think Jameco makes a kit. One time, I purchased a motor controller from a local surplus store. I suggest looking for a controller that works .... forget a one off design.
________________________________ From: EV <[email protected]> on behalf of Jan Steinman via EV <[email protected]> Sent: Friday, January 26, 2018 4:58 PM To: [email protected] Cc: Jan Steinman Subject: Re: [EVDL] Cheap DC motor control anyone? > From: Lee Hart <[email protected]> > > David Chapman via EV wrote: >> Lee I really appreciate the lead >> on the GE handbook, I downloaded it and indeed that circuit on pg 293 >> looks perfect for this project… So, it sounds like one of the goals of the project is to put something together from components? Because I thought Lee’s idea of finding a variable-speed electric drill at a thrift store or yard sale was really an excellent idea. You can probably do so for less than the costs of buying components, especially if you’re going to pay “single piece” shipping on them. And the drill speed control has the advantage of having been designed for motor speed control. Newer ones even use pulse-width-modulation, which you can tell if it makes a squealing or whistling sound at low speed. That sort of controller is going to give you the best low-speed control, with lots more torque. :::: The more the work is left to nature, the greater the net yield but the longer the time required... Thus sometimes the most apparently productive and high-yielding sources of energy involve a lot of activity for little return, while long-term investments, especially in naturally grown forests, provide the greatest value for future generations. -- David Holmgren <http://www.lmgtfy.com/?q=David+Holmgren> [http://lmgtfy.com/assets/sticker-b222a421fb6cf257985abfab188be7d6746866850efe2a800a3e57052e1a2411.png]<http://www.lmgtfy.com/?q=David+Holmgren> LMGTFY<http://www.lmgtfy.com/?q=David+Holmgren> www.lmgtfy.com LMGTFY :::: Jan Steinman, EcoReality Co-op <http://www.ecoreality.org/> :::: Welcome to EcoReality!<http://www.ecoreality.org/> www.ecoreality.org EcoReality is a nascent ecovillage on Salt Spring Island, British Columbia, Canada, dedicated to the ethics and principles of Permaculture, and to providing our own shelter, food, and energy in a sustainable and renewable manner. We do this by growing our own food, including raw goat milk and other protien sources, producing our own energy, including biomass, biodiesel and other sources, and by distributing our excess to the surrounding community, via direct farm gate sales, farmers markets, local grocers, and other channels. We are currently seeking one or more additional capital partners to take us to the next step of building thirteen unit of zero-carbon, zero-mile housing, using natural building techniques and materials. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.html#usub> EVDL Subscription Information and Help<http://www.evdl.org/help/index.html#usub> www.evdl.org About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV enthusiast Clyde Visser, is an active and vital source of information and help for people ... http://lists.evdl.org/listinfo.cgi/ev-evdl.org EV -- Electric Vehicle Discussion List - lists.evdl.org ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> lists.evdl.org The Electric Vehicle Discussion List is a forum for discussing the current state of the art and future direction of electric vehicles (EVs). We define an EV as a ... Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) [https://s1.yimg.com/dh/ap/default/130909/y_200_a.png]<http://groups.yahoo.com/group/NEDRA> Yahoo! Groups<http://groups.yahoo.com/group/NEDRA> groups.yahoo.com / -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180127/71bdef73/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
