Cheapest way to measure this?

Started by Anonymous in sci.electronics.basics6 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.basics6 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.basics7 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.basics7 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.basics7 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.basics7 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.basics7 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...


mosfet driver needed for logic-level mosfets?

Started by Anonymous in sci.electronics.basics7 months ago 43 replies

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an...

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an IRLZ34N as the power mosfet. Would a mosfet-driver be recommended to switch that mosfet on and off more quickly? Or is a logic-level mosfet already designed to efficiently turn on and off with the weak logic level signal? Thanks, Michael


Splitting an error signal into DC and High Freq.

Started by George Herold in sci.electronics.basics7 months ago 14 replies

OK this is a bit of a silly question. (But what the heck better than thawing tundra.) I want to split an error signal into HF and LF...

OK this is a bit of a silly question. (But what the heck better than thawing tundra.) I want to split an error signal into HF and LF parts. I've wired this up as an RC filter, taking DC (LF) from the cap., and using an instrument amp to read the voltage across the resistor. Error in----+---. | | R +--> Instrument R


OT: a great TV show if you like to tinker with stuff

Started by default in sci.electronics.basics7 months ago 11 replies

I'm watching this really interesting program from the BBC. It is called (James May) "The Reassembler." He takes everyday stuff, appliances and...

I'm watching this really interesting program from the BBC. It is called (James May) "The Reassembler." He takes everyday stuff, appliances and such, and takes them apart and reassembles them. He keeps a running commentary is intelligent, quick thinking, has a good vocabulary and has a great sense of humor/social awareness. You see him start with a table full of parts and he puts together (...


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