Comments on: The suboptimal way to get a copy of a journal article https://whats.all.this.brouhaha.com/2008/02/23/the-suboptimal-way-to-get-a-copy-of-a-journal-article/ miscellaneous musings and random rantings Sat, 28 Nov 2015 09:12:01 +0000 hourly 1 http://wordpress.org/?v=3.9 By: Les Hildenbrandt https://whats.all.this.brouhaha.com/2008/02/23/the-suboptimal-way-to-get-a-copy-of-a-journal-article/comment-page-1/#comment-3987 Mon, 24 Mar 2008 18:08:36 +0000 http://whats.all.this.brouhaha.com/?p=640#comment-3987 I just thought of something. One product I designed using this circuit, uses a 9 volt battery. If the battery is inserted backwards, the unit is protected. The problem occured when the people building the product would insert a battery backwards, then place the unit in a programming fixture injected power into the device after the reverse voltage protection circuit. The power from the programmer turned on the mosfet, which then allowed reverse voltage from the battery to enter the circuit.

It didn’t matter how many times I told them there was no need to insert a battery to program the unit, but now I digress.

]]> By: Eric https://whats.all.this.brouhaha.com/2008/02/23/the-suboptimal-way-to-get-a-copy-of-a-journal-article/comment-page-1/#comment-3976 Mon, 03 Mar 2008 06:55:41 +0000 http://whats.all.this.brouhaha.com/?p=640#comment-3976 Sorry, Les, Akismet thought that your comments were spam. Not sure why. Thanks for the info.

]]> By: Les Hildenbrandt https://whats.all.this.brouhaha.com/2008/02/23/the-suboptimal-way-to-get-a-copy-of-a-journal-article/comment-page-1/#comment-3964 Mon, 25 Feb 2008 15:57:54 +0000 http://whats.all.this.brouhaha.com/?p=640#comment-3964 My comment dissapeared, but here is a link to my source for that circuit.
http://pdfserv.maxim-ic.com/en/an/AN2012.pdf

]]> By: Les Hildenbrandt https://whats.all.this.brouhaha.com/2008/02/23/the-suboptimal-way-to-get-a-copy-of-a-journal-article/comment-page-1/#comment-3963 Mon, 25 Feb 2008 15:55:00 +0000 http://whats.all.this.brouhaha.com/?p=640#comment-3963 I use that circuit all of the time, I found it in an Maxim IC app note.

The drain and source are oriented (its a P channel fet) such that the body diode provides the initial path for current. The gate is hooked to ground. Once the current is flowing through the body diode, then the gate-source is forward biased and the source-drain turns on giving the low voltage drop.

If power is applied reversed, no current can go through the body diode, so that no vgs can exist.

http://pdfserv.maxim-ic.com/en/an/AN2012.pdf

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