KMoffett

Test..test..test The first image is with Copy/Past in Firefox 39/Windows7 Pro But didn't work. the second (Monostables) was with "Choose files"

http://www.5bears.com/welder.htm is one. Mine: http://metalworking.com/Dropbox/_2001_retired_files Look down the list for five "Miller Time" files Ken

One of the most amazing uses of electronics in farming to me is the real-time control of fertilizer delivery and planting based on variations of soil conditions and GPS location over a field. Ken

Pandit, Simple resistance/conductance detector circuits for water do not work with hydrocarbon fuels. The these liquids are not conductive. Ken

mbalegria, Your question has nothing to do with this thread. You should start your own thread with an appropriate title to get helpful responses. Ken

Because you needed to ask, and because I have no idea of your service entrance box configuration, I strongly recommend that you have an electrician do the check and any repairs. Ken

That is a symptom. What's the voltage at the two circuits in the circuit breaker box entrance. You need to have an electrician check all the connections at the service entrance and circuit breaker box. Ken

Likely, you have less than good neutral connection at the service entrance box or the utilitie's transformer. In the US the service supply is from a 220vac center-tapped transformer. Half the circuits in a house are supplied 120VAC from neutral to one end of the transformer's secondary, and the other half are supplied 120VAC from neutral to the second end. If the house neutral to transformer's center tap is lifted, the devices on the two circuits appear in series and become a voltage divider. If both circuits are equally loaded, each will see 120V. But if not, the circuit with the lowest resistance devices (more heavily loaded) drops proportionally less of the 220V across its devices. The circuit with a higher resistance (less heavily loaded) drops more. So, when you short out one circuit, most or all of the 220V appears across the other circuit. The bulbs on the other circuit see a supply voltage much greater than 120V, get brighter, and then burn out. I saw this in my parents house. Ken

How about showing us what you're doing...schematic?...voltages?...frequencies?...component ratings? ????? Ken

Check these segment addressable recorder/playback chips: http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ConsumerElectronicsIC/ISDVoiceIC/ISDChipCorder/Pages/default.aspx Ken

And even if you can assemble a circuit with a resolution of 0.001

Not only would the sensors be expensive, but the electronics with enough resolution "and" stability will be incredibly pricey. :( Ken

So resolution of 0.001

Schematic, free: http://www.nostalgickitscentral.com/eico/schematics/eico_schematic_1050.pdf Manual, on ebay: http://shop.ebay.com/items/EICO%201050%20manual Ken

Have you Googled: e square u10 chip u10 sounds like a 'schematic drawing label' for an integrated circuit chip, not the chip manufacturer's number. From my Google-ing it looks like "e squared" may be a double-e prom...electrically erasable programmable read-only memory chip. Do you have access to the schematic or to the circuit board? The equipment manufacturer should be able to give you the chip manufacturer's standard number for the component. Ken.

Something like this: http://www.fluke.com/fluke/usen/accessories/high-voltage-probes/80k-40.htm?PID=55357 Google: HV probe Ken

For you, the one you are most competent to complete. Your question lacks the details about your interests and training. Other wise Google: Final year electronics project FYP Ken

http://www.national.com/ds/LM/LM431.pdf Ken

It looks like it was for a 100W bulb. It was just a general example of how someone used voltage and current measurements to determine the filament's resistance over a range of operating voltages. And how the graphed data would look...if the OP tried it. ken

To show you what to expect using Herman's advice, here are a couple of graphs I picked up in the net sometime ago. Sorry I can't credit the author. Ken

What are you switching on/off/on to restart your system?...120VAC? ken

If you are not stuck on the LM723 (I couldn't find any dual-tracking supplies with it), there are a lot of of other options. Google: dual tracking power supply circuit Ken

Was used for many years successfully and safely. The idea of iontophoresis it to generate sweat on the skin and then analysis it. The circuit was also timed, and with over-current shutdown. Ken

This is a constant current source I used as part of an iontophoresis current source for our Peds Pulmonary Function Clinic...many years ago. The 67.5V battery was replaced with a 6vdc to 60VDC isolated DC-DC converter. The 60V gave us a wide dynamic range to compensate for skin resistance. Ken

Flux , except in extremely high impedance circuits like pH meter inputs, should not cause a problem. Years ago I read in an H-P service bulletin concerning field repairs to PCBs, that unless "all" flux can be removed (think in-factory process) it should be left in place. Ken