Design

.s2p file in SPICE
Hello, I was given an S2P (2-Port S-parameter) file and I need to use it in a netlist in SPICE. I have only ever worked with SPICE models, not with recorded data in SPICE. I believe that my S2P file might be in a magnitude and phase angle format versus the decibel and phase (degrees) format that SPICE prefers. I... 25 Jun 2008 19:08

op-amp nV input offset voltage
Hi, As you know, the *input* offset voltage is the voltage required across the op-amp's input terminals to drive the output voltage to zero. Although it has been my experience that for most op-amps the input offset voltage is due to the "-" input pin for the *most* part. For example, according to Spice the input... 2 Jul 2008 18:05

floppy drive emulator hardware usb or sdcard
I was looking on the internet for the HARDWARE-replacement of old 3"1/2 floppy drives in PC's running CDOS, version 1988, or PS/2-PC's, using MS-DOS NOT Y2000K, date set < y2000 still used as programming terminals in the industry. ( CDOS = Concurrent Dos, PS/2-PC is a dos-terminal in a public room, the previo... 17 Apr 2008 10:57

CMOS for driving MOSFETS?
Why not use smaller mosfets to drive larger mosfet gates? One could put them in the same package so that logic level signals could be used to drive large mosfets? I'm thinking of implementing that idea discretely but maybe there is a reason for it? (although its going to cost me about 2x the # of transistors bu... 15 Apr 2008 00:59

Formula for minimum drive current for mosfet
Whats the formula? I = 1/2*F*Q*V? Trying to figure out if I can drive http://www.fairchildsemi.com/pf/FD/FDD8424H.html with a uC directly? (I think it can supply up to 20mA or so) V = 12V if I use pullup and 5V if not. Thanks, Jon ... 14 Apr 2008 13:47

power flap detector
So I'm trying to protect a 5 ton heat pump from power flaps, the kind that occur when heavy winds blow trees across the primary feed to a rural home. The HVAC industry seems to have some prepackaged solutions, such as the ICM491 <www.icmcontrols.com/downloads/icm491_ig.pdf> but I'm wondering.. It seems to sa... 10 Apr 2008 14:31

OSC and unity gain buffer
Hi all, I need help with my circuit please. I have a one MHz osc fed into the positive input of the opamp LMC6484 and the negative terminal is connected to the output (unity gain buffer). At the positive input terminal I have the 1MHz. from the oscillator and I should see one MHz at the output as well but ... 11 Apr 2008 11:05

A/D converter
I'm looking for a sigma delta 3.5 digit display-type A/D converter with display hold and on-chip LED drivers. Something like the MAX1496EPI seems nearly ideal, but I can't find a vendor for it, and am hesitant to commit to a part which may not be available in small quantities later. The alternative, I suppose, ... 13 Apr 2008 12:44

TRANSISTOR SIV300004 needed....
or equivalent. I only need one but would like to have some spares. I have looked all over. I would even take a datasheet. Oh, please email if you have one/any as I don't check here often. Thanks for any help. j/b ... 7 Apr 2008 13:34

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