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Re: Heart Monitor help
I will do some research, but that looks like a driven shield common in EKG front-ends.
If you connect that lead to the shield, the conductor to shield capacitance is reduced since the signal and shield are at the same potential.
Re: dB and dBm
16dBm +-3dB
I have probably written it that way (dBm +-dB) a thousand times and never realized that it was possibly not technically accurate :!:
Maybe 16dBm +-3dBm :?:
13dBm ~= 20mW
19dBm ~= 79mW
You can convert that into E or I based on the load
:idea:
dB is an expression...
Re: soldering
A little basics:
Solder alone WILL NOT stick to copper! Flux is always required. You can sometimes repair a joint or add a wire because there is sometimes some left over flux unless you clean it.
There are several types of flux in use right now including: Rosin, no-clean, and...
tps5450 24v
Ouch, tough problem!
A linear regulator will have to dissipate (24v - 5v) * 5A = 95Watts!
You are really going to have to use a switcher, unless you live in a cold climate and want to heat the room :D
If you absolutely have to design your own, I would suggest going to National's...
What I do is create a new component for the application.
Assuming that if the part is in the schematic, it must have connections some where to the PCB.
Create a new DEVICE using the desired SYMBOL and a new PACKAGE with just the connections you are going to use on the board.
If you have PINS...
how to test if a pic16f877a is damaged
I don't want to get into "my uP can beat up your uP" (I actually saw a poster that said that! :D), but times have changed.
Right now the PICs are the most popular uC in the world. Since they pushed the 68HC11's out of the automobiles.
The reasons a lot...
I converted my old MPLAB ICD to an ICD-S40. I used my demo board to program a new 18F252 and changed the crystal to 10MHz.
It seems to work fine, except that the Vcc detect in CCS's ICD program gives a bad reading. It typically shows I have a Vcc ~4.61V, but when I measure it, it's at 5.02V...
interference serial port tx problem
Sorry if this is long, but my connection went down due to maintainence AFTER I started writing this, so I just figured I'd get it all down and go to bed. I'll send it in the morning. :D
I would suggest checking your power supply for something else first...
Re: capacitor in series
The resulting value (uF) of the network works as predicted.
Theoretically, you should get double the WV. Unfortunately, it doesn't work that way in the real world.
It is a problem of balance. If there are any differences between the characteristics of the two caps...
lcd 2x20 pinout
Personally, when all else fails, I just use individual wires. Matching connectors is always a problem, there are literally hundreds of thousands different types of connectors.
I haven't looked at the chip data sheet yet, but you may be able to buzz out (oops, continuity test)...
7x2 lcd pinout
I don't want to be too negative, but you will be lucky if you find detailed application information. I have had very little luck with non standard displays. I have quite a few I have never gotten working. Most of the brands are companies I can't even find. Most of the unusual...
cell phone jammer.pdf
I would not discount getting caught. If you were to inadvertantly jam another service; fire, police, aircraft, emergency medical devices, etc, finding you is NO PROBLEM. Prosocution is a sure thing.
My dad worked as an Engineer for the Federal Communication...
Our Cad dept. uses Alegro and Mentor, which are both extremely expensive programs.
I personaly use EAGLE and have used it professionally for ~ 4 years.
pros:
I've used it for up to 6 layer boards. It will handle blind vias and multi-layers with ease. Almost all the designs I've done have been...
Is that all anyone is using?
A, now defunct, company I worked for had developed RFID using frequency division. They actually had a measurable output, and we had a seperate receiver for the response from the tag. (Little in nature divides frequency).
The little metal strips in that popular (in...
Most LED dimming circuits are PWM. It is difficult to match brightness through the range with DC current.
For those interested in saving energy; an LED is more efficient at higher currents, therefore pulsing using 5x the current for 20% of the time puts out more light than the equivelent DC...
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