Received: by 10.216.194.136 with SMTP id m8mr908931wen.2.1350392281710; Tue, 16 Oct 2012 05:58:01 -0700 (PDT) X-BeenThere: pdxhackerspace@googlegroups.com Received: by 10.180.90.134 with SMTP id bw6ls10167223wib.1.canary; Tue, 16 Oct 2012 05:57:58 -0700 (PDT) Received: by 10.181.11.234 with SMTP id el10mr3604616wid.2.1350392278270; Tue, 16 Oct 2012 05:57:58 -0700 (PDT) Received: by 10.216.199.17 with SMTP id w17mswen; Mon, 15 Oct 2012 23:47:05 -0700 (PDT) Received: by 10.216.216.131 with SMTP id g3mr839753wep.10.1350370025086; Mon, 15 Oct 2012 23:47:05 -0700 (PDT) Received: by 10.216.216.131 with SMTP id g3mr839752wep.10.1350370025060; Mon, 15 Oct 2012 23:47:05 -0700 (PDT) Return-Path: Received: from mail-wi0-f174.google.com (mail-wi0-f174.google.com [209.85.212.174]) by gmr-mx.google.com with ESMTPS id cx9si929509wib.0.2012.10.15.23.47.05 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 15 Oct 2012 23:47:05 -0700 (PDT) Received-SPF: pass (google.com: domain of xenovaci...@gmail.com designates 209.85.212.174 as permitted sender) client-ip=209.85.212.174; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of xenovaci...@gmail.com designates 209.85.212.174 as permitted sender) smtp.mail=xenovaci...@gmail.com; dkim=pass header...@gmail.com Received: by mail-wi0-f174.google.com with SMTP id hq7so2740621wib.3 for ; Mon, 15 Oct 2012 23:47:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=4UroAZZcGLed0bEtf0HwoCRZqYzZ/SN95sX0C/ftKIY=; b=Y9HCy8FIOW/yz6lBid8/g1TzoAuB/tQdu26RLbg2ciWf0C8gv6fH8DDiS1bEb0X3+t Orhaukbeq7Pt4fqwKMwNNdh+XeZNiSQacTQ4v6n3aAS+D2xWLak2+D8K7vy9326hW9Ko HGc2HmlnavDXn3jVk/fbRNiQ5oGeaFuZkShgU/GGk0C/k7yu5O7I7NyuvfF7CRfJVhg5 2dudAikyXLfzkvc+xhVJFjHw2OQtGox2YX4nnxC9w5D17CCTGs7Nw4LRm3h7T/rwGCLn BN338KhnwzasXE3Y1cdXVrTafQt+OHrTGmLTVRooqrN5xwCPVWoy6zFgQSVk2YAIvBob r12A== MIME-Version: 1.0 Received: by 10.216.210.5 with SMTP id t5mr8510729weo.32.1350370024844; Mon, 15 Oct 2012 23:47:04 -0700 (PDT) Received: by 10.216.96.199 with HTTP; Mon, 15 Oct 2012 23:47:04 -0700 (PDT) In-Reply-To: References: Date: Mon, 15 Oct 2012 23:47:04 -0700 Message-ID: Subject: Re: [PDXHS] Re: Power supply project: Anybody interested? From: Ben Porter To: pdxhackerspace@googlegroups.com Content-Type: multipart/alternative; boundary=00504502d999a56c8e04cc278560 --00504502d999a56c8e04cc278560 Content-Type: text/plain; charset=ISO-8859-1 Here's some of the parts I've scoped out for the power supply: TL494CDG4: pwm controller Si8234AB-C-IS: mosfet driver MAX9918ASA+: current sense amplifier (for current feedback) NTD5867NLT4G: power mosfet Specifications I'm shooting for: 3 amps continuously @ < 10 volts, 1 amp continuously up to 24 volts. The reduction in current is a limitation of the transformer, and if a beefy enough transformer were used, it would be possible to do 3 amps at 24 volts. Transformers of this power are pretty spendy, but can be salvaged from old electronics for cheap. With the transfomer (120 volts AC to 24 volts AC), some passives & other various parts and the price for power electronics alone will be around $20-25. A USB enabled microcontroller & supporting HW will probably be another $5-10. Add in 7-seg displays, a fancy case, knobs & cables for ~ another $20. I'm designing the supply so the microcontroller can be added later optionally (it's only needed if you want to monitor/control the supply via USB or power some cool display). So does the price point & specs sound good? I can work on lowering the cost if that's an issue. As far as timeline goes, I should have something designed by next weekend, prototyped next week, and ready for others to put together around the end of October. Also, if anyone wants to be involved in the design/prototyping work, let me know! I'll probably be at the space this Thursday hacking something together. - Ben On Tue, Oct 9, 2012 at 6:14 PM, Aaron Eiche wrote: > I'll throw my hat in. I'd like to do one as well. > On Oct 9, 2012 6:10 PM, "Noor" wrote: > >> I'm interested in any project I can learn something from. >> >> If anything is going on I'd love to be a fly on the wall and learn >> whatever I can. >> >> I learn best hands on, so I'll be there to assist in anyway I can. >> >> Keep me posted. >> >> -Noor >> > --00504502d999a56c8e04cc278560 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Here's some of the parts I've scoped out for the power supply:=

TL494CDG4: pwm controller
Si8234AB-C-IS: mosfet driver
MAX9918ASA+: current sense amplifier (for current feedback= )
NTD5867NLT4G: power mosfet

Specifications I'm shooting for: 3 amps continuousl= y @ < 10 volts, 1 amp continuously up to 24 volts. =A0The reduction in c= urrent is a limitation of the transformer, and if a beefy enough transforme= r were used, it would be possible to do 3 amps at 24 volts. =A0Transformers= of this power are pretty spendy, but can be salvaged from old electronics = for cheap.

With the transfomer (120 volts AC to 24 volts AC), some= passives & other various parts and the price for power electronics alo= ne will be around $20-25. =A0A USB enabled microcontroller & supporting= HW will probably be another $5-10. =A0Add in 7-seg displays, a fancy case,= knobs & cables for ~ another $20.

I'm designing the supply so the microcontroller can= be added later optionally (it's only needed if you want to monitor/con= trol the supply via USB or power some cool display).

So does the price point & specs sound good? =A0I can work on lower= ing the cost if that's an issue. =A0As far as timeline goes, I should h= ave something designed by next weekend, prototyped next week, and ready for= others to put together around the end of October. =A0Also, if anyone wants= to be involved in the design/prototyping work, let me know! =A0I'll pr= obably be at the space this Thursday hacking something together.

- Ben


On T= ue, Oct 9, 2012 at 6:14 PM, Aaron Eiche <aaron.ei...@gmail.com>= wrote:

I'll throw my hat in. I&#= 39;d like to do one as well.

On Oct 9, 2012 6:10 PM, "Noor" <noororber= .moongarb...@gmail.com> wrote:
I'm interested in any project I can learn something from.

If anything is going on I'd love to be a fly on the wall and lear= n whatever I can.

I learn best hands on, so I'= ll be there to assist in anyway I can.

Keep me posted.

-Noor

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