Design

honeywell furnace controller schematic ST9120U1003
I've got a friend with a furnace that keeps blowing control boards. They go out about once a year. Anyone know where to get the schematic for this board? This is the 4th one replaced in his Heil furnace. I searched and all we find is people selling boards, no schematics. Thanks, Charlie Luke ... 10 Nov 2008 11:57

IR motion sensor
raphaele.thevenin(a)gmail.com wrote: Hello, I am trying to build a special IR motion sensor, I need a one pixel pyroelectric sensor and a focusing component for IR radiation. For the pyroelectric device I found the component SSAC10-11 from Nicera. I was wondering if someone knew if they had any competi... 25 Nov 2008 23:14

RC snubber on flyback primary
Hi, I am testing a flyback and trying to size the primary side RC snubber, without the snubber my fet blows up, I started with a 100ohm 1206 package resistor and a 47nF 1kV 1812 package capacitor, and now am using a 100ohm resistor and 10nF 1kV 1206 package capacitor, this still smokes a 1206 package 1/4 wat... 10 Oct 2008 18:14

89C51ED2
Anyone using this part experiencing problems? we have used them for 4 years or so. Date codes up to 0705 work ok, 0814 misbehaves....same chip, same software, 0814 doesn't execute properly... ... 18 Sep 2008 10:15

Intel details future Larrabee graphics chip
As the number of cores goes up the watt requirements goes up too ? Will we need a zillion watts of power soon ? Bye, Skybuck. ... 20 Aug 2008 16:59

LM3478 design gets insanely hot
Hello Experts, This is my first time designing a SEPIC type switchmode power supply with the LM3478MM from national as my controller. My design is pretty much the standard application as shown in the datasheet. The design is made to supply 24V out from a 15-32V input. Ouput current is 1A. My problem is ... 3 Aug 2008 18:10

120VDC Supply from 13.8Vdc
Anyone can suggest a simple way to design/build a switching supply to produce 120Vdc at 2 or 3 amps from a 13.8Vdc (car battery) with of the shelves parts? I thought using a cheap inverter and rectified the output, but the one I test produce a 150Vpp square pulse, witch will result in a 150Vdc output. A bit ... 1 Aug 2008 19:12

Continuous Sound Playing IC
On Jul 28, 12:52 pm, "Jon Slaughter" <Jon_Slaugh...(a)Hotmail.com> wrote: Supposedly the pic32's have a lot of audio features(such as decoding) and work well for sound.  Would be easy to set something up to use if you have used them before.  Just an option though. Hi, thanx, but I've used 8/16-bit cont... 30 Jul 2008 22:02

Japanese halberd Lima Electronics (Singapore) Ltd. Japanese halberd 137-1410 2508 Japanese halberd MSN: sz-lima@hotmail.com E-mail: lima13714102508@21cn.com
Japanese halberd Lima Electronics (Singapore) Ltd. Japanese halberd 137-1410 2508 Japanese halberd MSN: sz-lima(a)hotmail.com E-mail: lima13714102508(a)21cn.com Japanese halberd 7MBR10SA120/7MBR15SA120/IXTQ26N50P--137-1410-2508 Japanese halberd Hot Spot Japanese halberd Lima Electronics (Singapore) Ltd. Japanese halbe... 11 Jul 2008 18:11

large spice circuits
Does anyone have large spice netlists to share? I am looking to test simulation algorithms and need netlists with millions of transistors. I already have memory netlists and am looking for entire processor netlists (digital) or even RF chip netlists (analog). Are these publicly available as part of some benchmark... 27 Jun 2008 11:07