Referring laptop USB to Mains ground - bad idea? I have personally blown boards doing exactly this. Fortunately, the boards went before the controller PC did.
Having an isolation transformer on your bench is a...
Tuesday, 28 July 2020 - 22:15
How many watts of solar would I need? There is no worthwhile energy storage system such that, when the energy stored therein is rapidly released, doesn't go boom. That's sorta the very definition of energy...
Tuesday, 28 July 2020 - 06:09
How many watts of solar would I need? There's a roaring research field in using magnetically-levitated flywheels as energy storage, but I don't really think any are quite ready for prime-time. A Google search on...
Monday, 27 July 2020 - 20:54
How many watts of solar would I need? Kartman wrote:Interestingly, due to the proliferation of solar systems, there is a lot of hard data to draw from. The solar companies have this, so they can estimate fairly...
Sunday, 26 July 2020 - 10:23
328P sleep current wildly different between two copies Speaking of picking things up from Digikey, they sell quite a variety of current sensor ICs with shunt resistance in the milli (and micro I think!) ohm range. Might take a...
Sunday, 26 July 2020 - 01:17
Requesting advice: MOSFET or IGBT in place of BJT? Krupski wrote:
It's no fun to watch $60 swirl down the drain because some idiot (me) stuck a toe outside the SOA...
Oh, it may be no fun for you, but it's great fun...
Power BJT strange functioning - am I doing something wrong? ron_sutherland wrote:
From memory (>20 years ago, so probably wrong), I seem to recall something about current crowding is a problem with large BJT. Once an area of the silicon...
... and if any of the ghosts eat you, we shall take it out back by the woodshed and it'll never be seen again. S.
awneil wrote: Brian Fairchild wrote: 5. Prototype your solution Amazing how many people - both here & elsewhere - leap straight to a custom PCB without ever having...
js wrote: The water is contaminated. Certainly is if you've left a lot of dead leaves soaking around in it. S.
I have personally blown boards doing exactly this. Fortunately, the boards went before the controller PC did. Having an isolation transformer on your bench is a...
There is no worthwhile energy storage system such that, when the energy stored therein is rapidly released, doesn't go boom. That's sorta the very definition of energy...
There's a roaring research field in using magnetically-levitated flywheels as energy storage, but I don't really think any are quite ready for prime-time. A Google search on...
Kartman wrote:Interestingly, due to the proliferation of solar systems, there is a lot of hard data to draw from. The solar companies have this, so they can estimate fairly...
Speaking of picking things up from Digikey, they sell quite a variety of current sensor ICs with shunt resistance in the milli (and micro I think!) ohm range. Might take a...
Krupski wrote: It's no fun to watch $60 swirl down the drain because some idiot (me) stuck a toe outside the SOA... Oh, it may be no fun for you, but it's great fun...
ki0bk wrote: Use an MJ11033 if you need more current. Jim They have "interesting" Safe Operating Area curves too. Ask Me How I Know... S.
There has also been a LOT of development work in BJTs since the heyday of the 2N3055, but as the graphs show, it has been towards high currents at low voltages. Your other...
ron_sutherland wrote: From memory (>20 years ago, so probably wrong), I seem to recall something about current crowding is a problem with large BJT. Once an area of the silicon...
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