Cubrextit 10x20cm FR4 1.5mm PCB jednostranný
Kvalitní jednostranný sklolaminátový cuprextit. Velikost 10x20cm - 2 dm2. Tloušťka 1.5mm - měd 1x35um.
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Review by HMMWV for Rating: We understand more now about luhitim ion rechargable batteries than we did almost a decade ago. Back then, I designed products for Logitech to sell in the 100,000 qty that had a built in li-ion battery so the china company who made them came out to Fremont, CA and explained all the good, bad, and ugly about li-ion rechargables.Back then the good was no memory effect, charge when you want to, and a high terminal voltage of 3.5 4.3 V depending on mfgr The really bad is that just like we know every light bulb will eventually burn out, we also know that during the lifetime of the cell at any random moment, 1 in 100,000 li-ion cells will either explode or catch fire (back then this made headlines because it usually happened in an airport and most flyers were a little edgy to begin with). The reason was that laptop battery packs often had 10-14 cells in them thus multiplying the odds of a failure to 1 in 10,000 which are pretty good odds that someone's laptop is either going up in flames or making a big boom. Step forward 7-10 years Now we have the protection pcb (printed circuit board). It prevents the li-ion cell from being overcharged or undercharged, both of which are dangerous regions to operate in. PCBs are often gold plated with 50 microinches of hard gold you can see the underside of the pcb when you look at the tenergy battery. While the positive termial is just metal, the negative is gold. Not realy inside there is a metal connection to the protection board, and the under side of it has a circular gold spot to make contact with the device springs. The second photo attached above helps to illustrate this with the wrapper removed.When I bought my 18650 batteries on amazon recently there were 4 amp hour designs available: 2000, 2200, 2600 (these) and 3000. I chose the 2600 because it had the protection pcb in the package over the 3000 which normally I would jump at. It's a trade off I'm giving up 400 mAh to get the insurance that my cell won't do anything nasty while being charged or discharged. (in actuality the 2600 mAh are turning out to be more like 2800 mAh as I discharge them in testing)I'd recommend any li-ion cell TODAY that has the protection board built in. They are as safe as NiMH rechargables, and preliminary testing of these has shown they are actually about 2800 mAh instead of 2600 but I just got them in the lab and have not been able to draw any statistical conclusions on the design yet other than they are more than 2600.
Review by HMMWV for Rating: We understand more now about luhitim ion rechargable batteries than we did almost a decade ago. Back then, I designed products for Logitech to sell in the 100,000 qty that had a built in li-ion battery so the china company who made them came out to Fremont, CA and explained all the good, bad, and ugly about li-ion rechargables.Back then the good was no memory effect, charge when you want to, and a high terminal voltage of 3.5 4.3 V depending on mfgr The really bad is that just like we know every light bulb will eventually burn out, we also know that during the lifetime of the cell at any random moment, 1 in 100,000 li-ion cells will either explode or catch fire (back then this made headlines because it usually happened in an airport and most flyers were a little edgy to begin with). The reason was that laptop battery packs often had 10-14 cells in them thus multiplying the odds of a failure to 1 in 10,000 which are pretty good odds that someone's laptop is either going up in flames or making a big boom. Step forward 7-10 years Now we have the protection pcb (printed circuit board). It prevents the li-ion cell from being overcharged or undercharged, both of which are dangerous regions to operate in. PCBs are often gold plated with 50 microinches of hard gold you can see the underside of the pcb when you look at the tenergy battery. While the positive termial is just metal, the negative is gold. Not realy inside there is a metal connection to the protection board, and the under side of it has a circular gold spot to make contact with the device springs. The second photo attached above helps to illustrate this with the wrapper removed.When I bought my 18650 batteries on amazon recently there were 4 amp hour designs available: 2000, 2200, 2600 (these) and 3000. I chose the 2600 because it had the protection pcb in the package over the 3000 which normally I would jump at. It's a trade off I'm giving up 400 mAh to get the insurance that my cell won't do anything nasty while being charged or discharged. (in actuality the 2600 mAh are turning out to be more like 2800 mAh as I discharge them in testing)I'd recommend any li-ion cell TODAY that has the protection board built in. They are as safe as NiMH rechargables, and preliminary testing of these has shown they are actually about 2800 mAh instead of 2600 but I just got them in the lab and have not been able to draw any statistical conclusions on the design yet other than they are more than 2600.
Review by HMMWV for Rating: We understand more now about luhitim ion rechargable batteries than we did almost a decade ago. Back then, I designed products for Logitech to sell in the 100,000 qty that had a built in li-ion battery so the china company who made them came out to Fremont, CA and explained all the good, bad, and ugly about li-ion rechargables.Back then the good was no memory effect, charge when you want to, and a high terminal voltage of 3.5 4.3 V depending on mfgr The really bad is that just like we know every light bulb will eventually burn out, we also know that during the lifetime of the cell at any random moment, 1 in 100,000 li-ion cells will either explode or catch fire (back then this made headlines because it usually happened in an airport and most flyers were a little edgy to begin with). The reason was that laptop battery packs often had 10-14 cells in them thus multiplying the odds of a failure to 1 in 10,000 which are pretty good odds that someone's laptop is either going up in flames or making a big boom. Step forward 7-10 years Now we have the protection pcb (printed circuit board). It prevents the li-ion cell from being overcharged or undercharged, both of which are dangerous regions to operate in. PCBs are often gold plated with 50 microinches of hard gold you can see the underside of the pcb when you look at the tenergy battery. While the positive termial is just metal, the negative is gold. Not realy inside there is a metal connection to the protection board, and the under side of it has a circular gold spot to make contact with the device springs. The second photo attached above helps to illustrate this with the wrapper removed.When I bought my 18650 batteries on amazon recently there were 4 amp hour designs available: 2000, 2200, 2600 (these) and 3000. I chose the 2600 because it had the protection pcb in the package over the 3000 which normally I would jump at. It's a trade off I'm giving up 400 mAh to get the insurance that my cell won't do anything nasty while being charged or discharged. (in actuality the 2600 mAh are turning out to be more like 2800 mAh as I discharge them in testing)I'd recommend any li-ion cell TODAY that has the protection board built in. They are as safe as NiMH rechargables, and preliminary testing of these has shown they are actually about 2800 mAh instead of 2600 but I just got them in the lab and have not been able to draw any statistical conclusions on the design yet other than they are more than 2600.
(1 EUR) 23.4606 Kč