Design

Mosfet 7.5% increase in RDSON between 25C and 100C
Anybody hear of a mosfet that only has a 7.5% increase in RDSON between 25C and 100C. Because according to ST the STD15NF10 is just such a mosfet. I'm guessing this is a typo. Data sheet pg7 figure 11. http://www.st.com/stonline/products/literature/ds/7080.pdf ... 14 Jan 2010 11:17

How to protect Sensitive Op-Amp circuit from huge over voltageswhile turned off?
Raveninghorde a �crit : On Wed, 13 Jan 2010 08:55:20 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: What's the largest signal of interest? Can you short it with back-to-back schottky diodes (fairly large ones, if the capacitance isn't a problem)? Tim What voltage do you think sc... 13 Jan 2010 10:57

A digital design question
I'm playing around with some 7400 series logic, trying to teach myself the basics of digital design. I've been able to come up with a working circuit for a 24 hour digital clock easily, but I'm struggling trying to think of a way to make a 12 hour clock. Specifically my problem is the reset of the hours counte... 18 Jan 2010 04:16

Intel chimes
http://www.youtube.com/watch?v=RI0L1muEEIA&feature=player_embedded ... 16 Jan 2010 09:30

Now with C language was Released under GPL2: An 8051-8052 2 pass assembler for the Linux OS.
On Jan 12, 4:58 am, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: On a sunny day (Mon, 11 Jan 2010 18:36:20 -0800 (PST)) it happened MooseFET <kensm...(a)rahul.net> wrote in [... 8051 and C compilers ...] The 8051 assembler was very expensive, I had it on the job, 2500$ or so? So, I could not take that ho... 12 Jan 2010 15:12

IEEE was Re: Photodiode readout without transimpedance amplifier
On Sun, 10 Jan 2010 22:24:03 -0800 (PST), "miso(a)sushi.com" <miso(a)sushi.com> wrote: On Jan 10, 10:12 pm, "JosephKK"<quiettechb...(a)yahoo.com> wrote: On Fri, 8 Jan 2010 20:32:39 -0800 (PST), "m...(a)sushi.com" <m...(a)sushi.com> wrote: On Jan 8, 4:33 pm, "JosephKK"<quiettechb...(a)yahoo.com> wrote: On Wed, 6... 12 Jan 2010 08:09

Q of passive audio equaliser
Suppose you have a simple pot divider consisting of two equal value resistors, say 10K each. Across the upper one you connect a series LC circuit that resonates at 3KHz or thereabouts. If you drive this network from a low impedance source and plot the response across the bottom resistor, the Q of the resulting ... 13 Jan 2010 12:05

Fun with positive feedback
I'm having fun with these self excited oscillator thingies... http://webpages.charter.net/dawill/Images/LED_Buck_Supply.gif ....I think it will work... The traditional charge-the-base-bias-cap approach would probably work as well, but I wanted to try something slightly different. The main motivation is making... 15 Jan 2010 21:38

ON TOPIC... Circuit Design
Here's a 7-8 year-old chip design... www.analog-innovations.com/SED/SampleDesign_2010_01_11_A.pdf It was designed for qrk/Mark who posts here from time-to-time. I'll leave it to Mark to decide what to say about its functions before I elaborate. (The company, at least the Santa Barbara operations, are defunc... 14 Jan 2010 14:40

Custom LCDs
There were several requests for LCD info here. This http://linnix.com/lcd will handle "standard" small screens (3" to 5", upto 256x160). However, a long screen (12"x1") for reasonable resolutions will require custom layouts with 2 to 3 chips. Contact me if you still want to do it. ... 12 Jan 2010 21:53