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    HP Z820 with GTX 3090 24GB

    Hello, I need to power GTX 3090 24GB on my HP Z820 (1125 W PSU), because davinci needs more ram, so I got GPU with more ram, used 3080 12GB before. My Z820 has 3x 6pin connectors, and I have 3x HP adapters to 8pin. N1G35AA The service manual lists the power supply as "Up to two 300 W or three...
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    Replace catalytic element on Iroda MJ-950 heat gun?

    Hello, I've being told the Iroda MJ-950 does not have a replacement front piece with a mesh in it. I've only used my for few minutes for 10 times, and the catalytic element is flaking off inside already. very bad quality if you ask me. Now what to replace it with? I can get stainless steel...
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    Limited Lifetime warranty on memory cards?

    Hello, I wonder about Limited Lifetime warranty on memory cards? I have adata 16GB micro SDHC, that stopped working. Can't be detected at all. It was just in a phone for 6years, and 4GB used. Local seller has 2years wattanty, while adata advertises Limited Lifetime warranty. Now who should...
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    Help find this Mabuchi motor pinout

    Hello, I bought supposedly Mabuchi motor from ebay. The motor has optical encoder. The seller is no help, and I can't find any products starting with TD on Mabuchi website.
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    CTEK MXS Polar charger and AGM VRLA battery

    Hello, I have this CTEK Polar charger http://ctek.com/pt/en/chargers/MXS%205.0%20POLAR The CTEK list the COLD modes for this charger. Where is the AGM option? In warm weather I do not need 15V ! Manual lists the COLD mode that the voltage is up to 15.00v but most small VRLA 12v AGM...
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    constant current LED driver without PWM (and flicker)

    Hello, I chosen the sharp LED GW5DGE40MR5 http://www.newark.com/sharp/gw5dle40mr5/megazeni-white-50w-4000k/dp/89T3708 The driver is mystery to me, I need no flicker (means no PWM). Would this Mean Well work: http://www.meanwell.com/mw_search/ldd-h/LDD-H-SPEC.PDF Perhaps it's better to use...
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    Pause mode for CTEK MXS Polar charger

    Hello, I have this CTEK Polar charger http://ctek.com/pt/en/chargers/MXS%205.0%20POLAR In mode 8, Float charge the charger charges at 13.6 volts and ~10ma current that is pulsed etc. I want to be able to disconnect it from battery without it detecting it. I want to measure the battery...
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    shunt precission question

    Hello, I see there are panel meters like these nice ones http://stores.ebay.com/Elite-element/Dual-Display-Combo-meter-/_i.html?_fsub=3083749012 Some are 100A some 20A same voltage and everything, the only difference is shunt used. What about if I use 100A version to measure only 10A Max would...
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    new WAGO 221 spring loaded terminals a disaster

    Hello, well I could say that this is what you get when German company gets sold to Chinese. Now WAGO 222 spring loaded terminals are very good, the springs are so strong that it is not possible to put wire trough it if you disassemble the connector. You might manage to get one spring open, but...
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    Crimp tool hell or just solder it?

    Well, I've been soldering all my connections like Why the damn greedy manufactures would not make a crimp tool like this with large hole? It would be possible to fit any connection and crimp it, hex version is way better then a square shown here. Now the cable lugs and connectors does...
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    peakelec ESR70 measuring battery internal resistance

    Hello I have peakelec ESR 70. I ask if it's true 100khz meter: peakelec replies 1. I can confirm that the Atlas ESR (models ESR60 and ESR70) do measure the true ESR at 100kHz. It applies a test signal of exactly 100kHz and measures the true ESR and ignores the capacitor's reactance (unlike...
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    BOSCH reputable car battery manufacturer? then where are datasheets?

    As the title says: BOSCH reputable car battery manufacturer? then where are datasheets? For example take Bosch S4 car battery, where is datasheet with listed discharge curves? internal resistance?
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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?

    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.

    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

    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

    Hello, I tried to find some information why nobody tried to recondition not dead (no sulfation) but used CSB UPS battery for example the common type 12Ah. You could measure the electrolyte with a reflectoemter, you need only 1 drop. Then you could add water or acid to it. The actual acid...
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    Impulse DIY fuction for cordless screwdriver power tools

    Hello, I have an idea to make the impulse function on a makita brand cordless screwdriver. It is very handy to unscrew old bolts, or to drill to shiny surfaces like tiles. Unfortunatelly the impulse is metabo "inovation" - if you can call pulsed power to the motor innovation. It is...
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