Design
in [Electronics]
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Heat effect on FR4? I have a resistance circuit that dissipates ~1.2 watts. If I use 11 one watt resistors in series (physically parallel) I can spread the heat out across the width of the board. I measured ~66C under each resistor at worst case ambient (~32C) in the test setup. What will happen to to the board over time (>10 years... 14 Jun 2010 00:51
USB Cable shield continuity I have been having seemingly random noise problems where my PIC-based USB device will go into a USBSuspendControl state, and it requires the cable to be removed and replaced to reestablish communication. The problem usually occurs in the field where there is switching of high current and high voltage, but I was... 16 Jun 2010 17:43
conservation of Euros On Jun 10, 5:50 pm, "k...(a)att.bizzzzzzzzzzzz" <k...(a)att.bizzzzzzzzzzzz> wrote: On Thu, 10 Jun 2010 10:06:20 -0400, Spehro Pefhany <speffS...(a)interlogDOTyou.knowwhat> wrote: On Wed, 09 Jun 2010 20:37:37 -0500, "k...(a)att.bizzzzzzzzzzzz" <k...(a)att.bizzzzzzzzzzzz> wrote: Of *course*. The "Fair Ta... 12 Jun 2010 15:59
Electric scooter motor reversible? I have not found it on the web, but the part number is XYDJ09072117 It uses this controller. http://www.curriestore.com/731-ezip-controller.html "Controller, 24v30a BG 5pin, TO/Charge Cut, (08A version)" Basically the same as this 500 W motor. http://www.curriestore.com/481-ezip-motor.html Does just reversin... 11 Jun 2010 19:15
Smarter dummy load; was Re: 3 line to 7 line decoder, got a name? On Thu, 10 Jun 2010 08:40:40 -0500, John Fields <jfields(a)austininstruments.com> wrote: On Thu, 10 Jun 2010 11:06:14 +1000, Grant <omg(a)grrr.id.au> wrote: On Wed, 09 Jun 2010 18:09:58 -0500, John Fields <jfields(a)austininstruments.com> wrote: On Wed, 9 Jun 2010 11:10:48 -0400, WangoTango <Asgard24(a)mi... 10 Jun 2010 20:10
High voltage, high frequency discrete opamp Hans, If you are still out there, there are two used high voltage excite amps on Ebay in the US. Look at item 290360425190 and item 350159383389, each listed for $999. These are from the Nicolet-designed FTMS 2000 system (Nicolet, Extrel, Finnigan, Thermo, whatever). They have two independent channels wit... 10 Jun 2010 20:10
Video capture card used as scope. I was wondering if anybody has tried using a cheap video capture card as a (cheap) scope? Any pointers? TIA! P. ... 11 Jun 2010 23:38
PSpice Simulation Problem (not the desired ouput) Hello all! I am trying to simulate a circuit from a book called "DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC INSTRUMENTATION : A Practical Perspective of the Design, Construction, and Test of Medical Devices " by DAVID PRUTCHI and MICHAEL NORRIS. This is the circuit: http://img571.imageshack.us/img571/6449/... 11 Jun 2010 11:27
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Looking for circuit design & prototyping contractors Hello, I'm looking for people experienced with electronics design and prototyping to help me build a control box for an invention I am trying to develop to a technology demonstrator stage, at an affordable cost. This is for an invention I recently patented - GB 1000110.5 "Vehicle propulsion and protection system... 15 Jun 2010 15:24 |