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    Battery logger like "Doc Wattson" with logging to PC

    Hello, I'm looking for Doc Wattson but with logging to PC. Doc Wattson http://www.rc-electronics-usa.com/ammeters/r102-amp-hour-specs.html voltage 1% accuracy current 2% accuracy So far I found the: http://www.victronenergy.com/battery-monitors/bmv-700 voltage 0.3% accuracy current 0.4%...
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    capacitor ESR table - different values from different manufacturers?

    If you mean you use something like Sencore-LC101 that's one heck of a meter ! 10x more range than Atlas ESR70, and I'm not speanking that Sencore can measure from 1pF to 200,000 μF Getting back on topic here, yes there should be standard for ESR values, now it seems the Blue ESR table is really...
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    capacitor ESR table - different values from different manufacturers?

    So what chart is better? Caps are caps and there should be agreement what is considered low enough ESR for a cap to work properly. (blue esr 1.6ohms) and (atlas 16ohms) (blue esr 0.6uhms) and (atlas 2ohms) more than 2x difference. These tables both seems like nonsense then, one of them is...
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    capacitor ESR table - different values from different manufacturers?

    Hello, if you take a look at manuals of Atlas ESR70 meter and then Anatek BlueESR, two most respectable (and expensive) meters, you will see that their recommended capacitor ESR values are very different. www.peakelec.co.uk/resources/esr70_userguide_en.pdf...
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    LM338K or Mean Well LDD-H for flicker free 3W LED driver?

    Hello, I know for a fact that LM338 as constant current source is flicker free as LED driver, but it heats up and is not power efficient. Size is another problem. The Mean Well LDD-H is a box about 2 x 3 cm in size http://www.meanwell.com/search/LDD-H/LDD-H-spec.pdf The dimming is done by...
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    Reliable 18v to 5v USB voltage converter.

    This would work? http://www.littelfuse.com/products/tvs-diodes/leaded/1_5ke/1_5ke8_2a.aspx
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    Reliable 18v to 5v USB voltage converter.

    why there are so many negative reviews?
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    Reliable 18v to 5v USB voltage converter.

    So I need 12V TVS diode? But wiring shows it connected to ground, and on a car there is no true ground! I'mm use my converter at home, I have neutral and ground same wire. All there protections that require to connect to ground are nonsense (they offer false sense of protection if you connect...
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    Reliable 18v to 5v USB voltage converter.

    I have ordered some relays myself http://www.ebay.com/itm/200983219558?var=500198856035&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 Can you post a link what model failed you? I found this new converter ...
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    Reliable 18v to 5v USB voltage converter.

    This looks like really reliable PSU, however I can't spend that much on a converter. I'm not from USA and my currency is 2.5x less worth that 1$, so I cant pay 2.5x more I think even you would not pay 150$ for this PSU. My Arduino however works fine, despite being bought from ebay. You forgot...
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    Reduce transducer power for ultrasonic bath?

    Here are the photos, what a shocker they (ulsonix) assembled it very dangerously. Should I clean the flux even more? Photo01, very dirty PCB. http://i.imgur.com/nme7BXL.jpg Photo02, dangerous assembly http://i.imgur.com/9MnLxCo.jpg Photo03, Back of PCB http://i.imgur.com/l4d3kL5.jpg...
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    Reduce transducer power for ultrasonic bath?

    The model is Proclean 507, how do I know if it is 1. ceramic crystal transducer and resonant oscillator 2. oscillator is operating independently from the transducer
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    Reliable 18v to 5v USB voltage converter.

    Hello, I have Microtik router that has unpowered USB port that I would like to use. I want to use a stepdown converter to power it. The converter obviously needs to be reliable, block inrush voltage when turned on etc. This would work OK...
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    Reduce transducer power for ultrasonic bath?

    Hello, I would like to reduce transducer power for ultrasonic bath. 1. I could use analog simple wirewound pot I think. I would have to measure amps, volts, then see what power pot I need. This would allow to pass the 25Khz signal to transducer unaltered right? 2. I could use some sort of...
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    Ionizer ion generation control

    Here are some shots from how it's made. There already is a small pot on the hi voltage controller. Anyone can decipher what it is looks like 205 ohms, kohms ? Meanwhile I have ordered connectors so I do not have to cut any original wiring. I'll measure voltage and current what I get the...
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    Ionizer ion generation control

    Hello, I have a ionizer that uses a step up controller for ion generation. There is a main board with all controls and then the high voltage step up controller connected by 2 wires, red and black. I did not measure the voltage but it seems it's dc. Can I add simple potentiometer to control...
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    Why nobody reconditions a UPS battery

    Them millions of people who add water to heir batteries life's are too placid.
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    Why nobody reconditions a UPS battery

    Battery never explode if you add water to it (it cease to work if acid is diluted), and besides it does have valves. Seems like Catalysts on VRLA Batteries Save Air Force Millions of Dollars...
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    Why nobody reconditions a UPS battery

    Well I talked about CSB batteries the brand normally used by APC UPS systems. The reason I'm asking abour reconditionins is this: Quite few years back I had a situation where a CSB manufacturer rated battery for 8 years on standby failed after 4. I added 2ml of distilled water to every cell...
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    Why nobody reconditions a UPS battery

    Every UPS battery has these plastic caps on top that are protecting the rubber caps that are sealed at negative pressure when battery works normally, but if overcharged the caps release gas and electrolyte is wasted. It is very easy to take the caps and refill. Most of the users refill only...
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