Open the (mosfet) gate!

Started by Anonymous in sci.electronics.basics2 months ago 51 replies

I was looking at this datasheet: http://www.irf.com/product-info/datasheets/data/irlz34n.pdf Rds,on is 0.035 ohm with Vgs=10V (Id=16A) and...

I was looking at this datasheet: http://www.irf.com/product-info/datasheets/data/irlz34n.pdf Rds,on is 0.035 ohm with Vgs=10V (Id=16A) and it's advertised as such on the first page. But at Vgs=5V (Id=16A) the Rds,on is 0.046 ohm! I thought it was a logic level mosfet; I thought the gate would be FULLY OPEN at 5V... I guess I was wrong..? Michael


JFET mini-comparo--BFT862 not actually unique

Started by Phil Hobbs in sci.electronics.basics2 months ago 2 replies

I promised a bit of low-noise JFET comparison data. I looked at 4 BF862s from different reels, three ON Semi parts, the CPH3910, NSVM2394, and...

I promised a bit of low-noise JFET comparison data. I looked at 4 BF862s from different reels, three ON Semi parts, the CPH3910, NSVM2394, and NSVJ3557, and the Fairchild MMBFJ310. I swapped them in the same QL01 photoreceiver prototype, and found that all flavours of BF862 (from 4 reels) and two ON Semi parts, the CPH3910 and NSVJ2394 were indistinguishable (within a fraction of a dB out t...


Unfamiliar FET and capicitor schematic symbols

Started by Anonymous in sci.electronics.basics2 months ago 12 replies

In the simplified schematic for the Analog Devices AD825 there are two symbols I haven't seen before. One of them is an FET symbol and the other...

In the simplified schematic for the Analog Devices AD825 there are two symbols I haven't seen before. One of them is an FET symbol and the other is a capacitor. These can be seen in Figure 32 on page 10 of the AD825 datasheet. The POS and NEG inputs each go the gate of FETs with this symbol. The capacitor symbol is labeled Cf and are connected to VOUT. Not sure if whay I'm looking a


Cheapest way to measure this?

Started by Anonymous in sci.electronics.basics2 months ago 8 replies

I have to use a CPAP to sleep well. I'm going camping and will need to bring battery power for the thing. So I would like to measure the power...

I have to use a CPAP to sleep well. I'm going camping and will need to bring battery power for the thing. So I would like to measure the power draw over several nights to see what the highest power draw is. The machine changes the air pressure depending on my particular needs so I can't just plug it in and measure the current draw. I was wondering if perhaps one of those cheap DSOs would be...


Leeanne Ericson needs your help

Started by Rob Gibbings in sci.electronics.basics2 months ago

https://www.gofundme.com/leeannes-medical-fund Shark attack victim identified as mother of...

https://www.gofundme.com/leeannes-medical-fund Shark attack victim identified as mother of 3 http://www.ocregister.com/2017/05/01/shark-attack-victim- identified-as-mother-of-3/ The woman attacked by a shark over the weekend off San Onofre State Beach was identified by friends as Leeanne Ericson, a mother of three who was camping off the military base, according to news reports. ...


supercap leakage

Started by John Larkin in sci.electronics.basics2 months ago 28 replies

https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Supercap_Leakage.JPG Looks like it would be fine to stack these in series without...

https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Supercap_Leakage.JPG Looks like it would be fine to stack these in series without any equalizing parts, like regular wet aluminum caps. Measuring supercaps is an enormous pain; every step takes hours. The equivalent dielectric absorption is huge. Leakage tempco appears to be strongly negative, but that may be an illusion. -...


datasheet for THGBMFG8C4LBAIR

Started by Gert Bass in sci.electronics.basics2 months ago 2 replies

Hi! Can anyone point me to the datasheet for an thgbmfg8c4lbair 32GB emmc flash chip? Searching only brings up a press release from 2014...

Hi! Can anyone point me to the datasheet for an thgbmfg8c4lbair 32GB emmc flash chip? Searching only brings up a press release from 2014 and Toshiba hasn't replied to me yet. For now I would be happy with the pinout and I assume it's the same across the whole chip family and even different manufacturers. If you know a different source for a datasheet or pinout for any FGBGA Emmc chips...


Vce,sat vs Rds,on

Started by Anonymous in sci.electronics.basics2 months ago 37 replies

Hello, From this datasheet for the TIP31A, https://www.onsemi.com/pub/Collateral/TIP31A-D.PDF I see that Vce,sat is 1.2V with Ic=3A. ...

Hello, From this datasheet for the TIP31A, https://www.onsemi.com/pub/Collateral/TIP31A-D.PDF I see that Vce,sat is 1.2V with Ic=3A. To calculate the equivalent of Rds,on (if I were to use a mosfet instead), would the TIP31A give a resistance of R=V/I = (1.2V) / (3A) = 0.4 ohms at saturation? Thanks, Michael


jfet

Started by John Larkin in sci.electronics.basics2 months ago 4 replies

Good, people are still introducing jfets. http://www.onsemi.com/PowerSolutions/product.do?id=NSVJ3910SB3&featured=featured Good Gm, 15...

Good, people are still introducing jfets. http://www.onsemi.com/PowerSolutions/product.do?id=NSVJ3910SB3&featured=featured Good Gm, 15 cents, and "low noise", whatever they mean by that. -- John Larkin Highland Technology, Inc lunatic fringe electronics


Is this scheme reasonable?

Started by Anonymous in sci.electronics.basics2 months ago 49 replies

I have an automatic opening trash can in the kitchen that runs off of batteries. I wanna run it with a wall wart. When the lid opens it draws...

I have an automatic opening trash can in the kitchen that runs off of batteries. I wanna run it with a wall wart. When the lid opens it draws more power than the 750 mA wall wart I tried using to power it could deliver. This makes sense. I don't want to use a bigger wall wart and I don't want to have betteries in it all the time to provide the current. I'm thinking instead of using a capaci...


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