Basics

cascading two dc/dc regulator
I use two dc/dc regulator to generate 12V and 5V output from 40V input. 40V --- LM5576 --- 12V 40V --- LM5576 --- 5V Since LM5576 is too expensive, I wonder if I can use a cheaper dc/dc converter in cascade with LM5576 to generate 5V from 12V as the following? I can not use a LDO for 12V to 5V because the ... 3 Oct 2008 03:06

LEI-4 transformer
Hi - I yanked some parts from an old APC unit - a 350 (I think). A chunky transformer has markings of LEI-4, 430-2020 and also 155D. Think this think is worth keeping? Thing weighs about 3 lbs. I did find posts on measuring various aspects of unknown transformers but I think I'll leave that till I have some more... 30 Jul 2008 18:56

manual solution solution manual study guide
These are part of our solutions not shown here , if the solution you want isn't in the list, do not give up, just contact us and we will find it to you email: lsms4[at]yahoo.com it's slsms4(a)yahoo.com we have a lot of solutions manual over 2000 solutions manual solution manual Math solution ... 14 Jul 2008 21:57

advise on ESR meter project ?
after diagnosing an old microcontroler board with lots of various old caps i thought maybe an ESR meter to be a good tool for the tool box ? yes/no or a better tool for the box so i googled for some ESR meter plans and settled on this one ..... http://ludens.cl/Electron/esr/esr.html could someone comment o... 28 Dec 2007 08:55

How to interface Arduino to a 12-bit serial DAC
Can anyone give me some pointers on what I would need to do to get a TLV5618 12bit serial DAC running with an Arduino? I want to be able to output 0-5v under program control. http://focus.ti.com/lit/ds/symlink/tlv5618a.pdf Particularly how I connect CS, SCLK, and REF to get the chip working. Thanks, ... 28 Oct 2007 11:01

OVP With the MC3423
I'm using the MC3423 for OVP and the remote activation pin for current limiting. I've been seeing some pretty weird behaviour. For instances the MC3423 will activate and apply a gate pulse to the SCR when it senses an OV the BJT Q1 saturates and pulls the gate to ground as it should the weird thing is there is stil... 25 Oct 2007 16:39

Citizen C504DVC trouble
I've got a few things I want to do with my DVD/VCR combo player that I can't seem to get it to do. 1. I want to use it to view TV channels instead of tuning with my TV, because my TV is mono only and thus I can't use stereo speakers with it; with this combo player I can hook up stereo speakers to the RCA jack (w... 21 Jun 2007 15:43

Litz wire for AM ferrite Rod Antenna?
How much improvement can I expect using Litz wire to wind a AM ferrite Rod antenna as opposed to using solid copper wire? Is it worth the trouble to obtain Litz wire, or can I expect almost the same response at say 1 MHz using regular solid enamaled copper wire? -Bill ... 2 Apr 2007 23:36

Crimp tool for Molex terminals
Anybody know of a reasonably priced crimp tool for Molex 50079-8000 or 50079-8100 crimp terminals? The Molex tool is 63811-0300 but it sells for around $200.00 so I'm really looking for an Asian "knockoff". ... 17 Mar 2007 17:49

555 Timer Duty Cycle
Hi, I'm trying to use a 555 timer to produce a PWM waveform however can't find any reference as to how the value of the resistor* can be used to calcuate the duty cycle. Is there a formula that says something like when you use Xohms it gives 2X% duty cycle? Cheers, Michael *http://www.scienceprog.com/... 16 Feb 2007 06:44