https://ww.electrek.co/2019/12/24/california-bans-per-minute-billing-tesla-superchargers-will-ne ed-displays/ It's about "time" they realize...

https://ww.electrek.co/2019/12/24/california-bans-per-minute-billing-tesla-superchargers-will-ne ed-displays/ It's about "time" they realize that some chargers are EV highway robbery. As i posted some months ago, final charging (above 70% of battery cap) costs more than gasoline equivalent. At 90%, it's more like 3x gasoline equivalent.

In the course of my work, today I was handed a defunct Apple Mac laptop. The person commented "BTW the battery is bulging a bit" Within 2...

In the course of my work, today I was handed a defunct Apple Mac laptop. The person commented "BTW the battery is bulging a bit" Within 2 hours I had 3 Mac LiIOn batteries with bulges. One so extreme that the casing fell apart in my hands. After a chat with the university fire officer, these are now in "secure containment" outside the building (a metal bin away from anything flammab...

I've got a battery management unit that is reluctant to demonstrate functionality. The vendor's terminal com software seems non-functional...

I've got a battery management unit that is reluctant to demonstrate functionality. The vendor's terminal com software seems non-functional (will not install). So far the only evidence of life is a control line (one of three) hard on, and rare /XFFE /FFF signalled outputs on the rs232 port. Internal DC-DC fails to power LEM sensor. Balancing terminals seem inactive. Can anyone recom...

These monsters have a 1,000 kWh battery pack. Of course they're not going to tell you it was doing only 25 MPH all the...

These monsters have a 1,000 kWh battery pack. Of course they're not going to tell you it was doing only 25 MPH all the way... https://www.teslarati.com/tesla-semi-81k-pounds-500-miles-range-elon-musk/

I have a "dumb" NiMh/NiCd charger. For 9 volt batteries, it specifies 25 milliamps. The charger manual gives this charge...

I have a "dumb" NiMh/NiCd charger. For 9 volt batteries, it specifies 25 milliamps. The charger manual gives this charge formula. Charging time(h) = 1.2 x battery capacity (mAh) -------------------- charging current (mA) 13.44 hrs. Is is formula useful or is there something better that factors in the starting Voltage ? Thanks.

I'm looking for a low cost contact material that can withstand being exposed to unconditioned warehouse conditions for months without the surfaces...

I'm looking for a low cost contact material that can withstand being exposed to unconditioned warehouse conditions for months without the surfaces becoming corroded or oxides. The shape of these will be similar to D cell batteries with a spring on one side and a flat contact on the other. The device is not a battery but mounts similarly and must work reliable on first install. No jiggling ...

Folks, Got a Dell Vostro 200 mini tower with XP on there that seems to be a bit off in the realtime clock lately. Around five years old so...

Folks, Got a Dell Vostro 200 mini tower with XP on there that seems to be a bit off in the realtime clock lately. Around five years old so needs a new 3V coin cell on the mobo. In order not to lose all the setup stuff, can those CR2032 coin cells be hot-swapped while the PC is running? Of course using ESD straps, being careful and all that. -- Regards, Joerg http://www.analogco...

https://youtu.be/FSwZQtqWyHw Can that whining noise be easily eliminated? I am assuming its origin is easy for some to guess. It uses...

https://youtu.be/FSwZQtqWyHw Can that whining noise be easily eliminated? I am assuming its origin is easy for some to guess. It uses brushless motors controlled by an "electronic speed control" (ESC). There is a large cap across each ESC supply plus and minus. I tried adding a 1000 ?F low ESR capacitor on the battery input but that didn't help. Thanks.

I'm setting up a UPS for my computer/comms equipment using an inverter/charger and battery from Amazon. The equipment draw is only about 40...

I'm setting up a UPS for my computer/comms equipment using an inverter/charger and battery from Amazon. The equipment draw is only about 40 watts measured with a Kill-A-Watt, but all the associated wallwarts use capacitive-input switching power supplies. That means they only draw current at line peaks. My seat-of-the-pants guess is that the duty cycle is around 10%, meaning that the aver...

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https://www.electronicdesign.com/technologies/test-measurement/whitepaper/21140081/warning-your- dmm-is-discharging-your-battery-cell?utm_source=EG+ED+Today&utm_medium=email&utm_campaign=CPS200 828010&o_eid=7322A4702401H9R&rdx.ident%5Bpull%5D=omeda%7C7322A4702401H9R&oly_enc_id=7322A4702401 H9R It's sad how bad the electronics press has become. -- John Larkin Highland Technol

Last time I checked the globe is one big place. This requirement for American only manufacture is wrong. America is not the only place where...

Last time I checked the globe is one big place. This requirement for American only manufacture is wrong. America is not the only place where people require employment, and American EV industry benefits from foreign innovation, as well as vice versa. The battery minerals and materials issue could be handled by requiring the supplier country to submit to inspections and audits- which

I bought the following 4A 5V supply adapter:...

I bought the following 4A 5V supply adapter: https://cpc.farnell.com/stontronics/t6819st/ac-dc-power-supply-5v-4a-2-1mm/dp/PW04378?st=5v%20po wer%20adaptors with the aim of trying it as an alternative supply for my 16 year old curtain controller circuit. At present I successfully use 3 x AA Nimh batteries, delivering a voltage of about 3.8 to 4.1 V (measured at the battery terminals). Current

I am bringing my Leaf to Vegas for someone to work on. Unfortunately, many mechanics refused to touch anything EV, even if only to drop the...

I am bringing my Leaf to Vegas for someone to work on. Unfortunately, many mechanics refused to touch anything EV, even if only to drop the battery down for me to work on. My Leaf currently have 15kWh, which is fine from the SF area to Bakersfield. However, there are three major charging gap in kWh. Mile gap is misleading. (1) and (3) are around 25 miles. (1) 20kWh: Baker to Valley Well R...

I dread all those extension cords when using the hedge trimmer and other stuff. I found that if I connect the E-bike battery of a friend to it...

I dread all those extension cords when using the hedge trimmer and other stuff. I found that if I connect the E-bike battery of a friend to it the hedge trimmer runs somewhat slower but reliably. It had 53V DC. Those machines contain brush-type universal motors, probably with a compensation winding but not sure. Is is safe to run these with 40-60V DC over long periods of time or is ther...

On some of the inexpensive Dell laptops they implement a hardware-lockout system intended to prevent you from using aftermarket charger bricks...

On some of the inexpensive Dell laptops they implement a hardware-lockout system intended to prevent you from using aftermarket charger bricks to charge the battery. The way they do this is there's a chip in the Dell charger that contains a unique identifier which a chip on the laptop mobo requests from it on startup over a one-wire interface. If on boot the BIOS can't confirm that the ...

Gentlemen, I want to monitor current drawn from a car battery (12v lead-acid) in such a way as when it drops below 200mA, a piezzo buzzer...

Gentlemen, I want to monitor current drawn from a car battery (12v lead-acid) in such a way as when it drops below 200mA, a piezzo buzzer sounds. The range of current the monitor will see will run from 15A to around 75mA. The 15A will last for only around 10s or so and once it settles down will drop to 240mA for hours on end. This is just to monitor quiescent current drain and there will b...

I have a differential output from a fast CML flipflop, powered by +3 and ground, and want to drive another CML-input part. If the load gadget...

I have a differential output from a fast CML flipflop, powered by +3 and ground, and want to drive another CML-input part. If the load gadget was also powered from +3, I'd just connect them with a couple of 50 ohm traces. But the Vcc of the destination part could be anything from +3 to -2. I want full speed and DC coupling, so the ideal part to put in series with both runs is a battery ...

So I was out at UB, (picking up some stuff) I was talking with Bruce's* final grad student. He had some success biasing a resistive FIR...

So I was out at UB, (picking up some stuff) I was talking with Bruce's* final grad student. He had some success biasing a resistive FIR detector with a current source. The grey haired tech turned him onto an LM134. (A new IC for me too.) http://www.ti.com/lit/ds/symlink/lm134.pdf Apparently they are running it dry down at 1uA and either need more voltage or less current.** (Suppl...

https://www.studyfinds.org/fear-for-safety-every-day/ What's wrong with kids these days? Most have been super-protected children but are...

https://www.studyfinds.org/fear-for-safety-every-day/ What's wrong with kids these days? Most have been super-protected children but are afraid of life. Engineers have to THINK, blow things up, take calculated risks. Fear warps prudent judgement. I've had interns that were afraid to touch a board powered from 5 volts, or handle a 12 volt battery. And wanted eye protection and masks ...

I have a situation where I need to change a momentary switch to an on / off switch. This is ordinarily very easy using a JK Flip Flop, but there...

I have a situation where I need to change a momentary switch to an on / off switch. This is ordinarily very easy using a JK Flip Flop, but there is a twist. The device runs on a 6S Lithium battery, so the voltage will vary from about 18V to 25V or so. In addition, I need the power control circuit to use very little current - on the order of 100 uA - when off. It can use much mor