Latest threads in Electronics Designshow only best voted threads
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Using Raw Li-Ion Cells with a Protection Board
I need a small Li-Ion charger/protection board for a 3 cell (series) pack, i.e. If I understand this correctly, this is for use only with unprotected Li-Ion cells because it has the protection circuit...
1
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7 years ago
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Driving 74LS from 3.3V uP
Prototyping a little toy for the kiddos out of junk box parts... I have a IV-9 Numitron connected up on a PCB to a 74LS47 BCD to 7 segment driver. uP is a 3.3 volt ATTiny (Adafruit "Trinket" devboard)...
48
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7 years ago
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48 | |
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OT: Speaking of Toast
Speaking of Toast... We have a Toastmaster toaster... "Design by F.A.Porsche" no less... sleek, pretty, which is why my wife bought it, but it's crap for function... uneven toasting, poor...
28
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7 years ago
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28 | |
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Hartley Oscillator: Two Coils, No Cap
Would it be possible to build a single transistor Hartley oscillator by substituting a pancake (spiral) coil for each leg of the center-tapped inductor, and then placing one coil flat on top of the...
17
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7 years ago
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17 | |
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Boring old connectors -- 7.5A, smallest possible
So, I'm looking for the smallest possible connector that's rated for 7.5A or more. This one is looking OK: The size is reasonable for my application, but the mating housing only takes up to 18-gauge...
6
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7 years ago
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6 | |
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t's s
People tend to treat "next higher level" money (which is mostly Federal money in the US) as free somehow. They want to get all they can. That money has to come from somewhere, with some...
12
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7 years ago
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12 | |
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tea and toast
Seems to me that the more power you apply in an electric kettle, the more efficient it is. Toasters ditto.
111
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7 years ago
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111 | |
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HOTs *can* handle 1200V
In fact, most HOTs (Horizontal Output Transistor -- 1500Vcbo, 5-20A, Vce(sat) 2-5V @ hFE = 2.5) handle 1600-1800V at breakdown. Most trigger in avalanche rather slowly (~100ns), though I've seen a few...
6
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7 years ago
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6 | |
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Ping Hobbs: JFET Noise
Phil, I have a chip situation, differential input, HiZ required. I have available to me NJFET's (sizeable) and good NPN's. What's the best differential configuration for low noise? The customer thinks...
35
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7 years ago
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35 | |
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Fractals
I hear fractals are used for designing cell phone antennas to maximize receptive power in a minimum amount of space. So why can't you just use a length of wire wound in a spiral arrangement to occupy...
18
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7 years ago
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18 | |
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ID component
It looks like a ceramic cap, 8mm diameter, with leads that lay across opposite faces and cross at the center. I suspect it's a polyfuse or similar. Markings: B R075 4053S
11
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7 years ago
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11 | |
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Making secure mechanical connection to IC pins to modify equipment
I have a piece of music gear on my bench which I'm modding for a client. Needs some new wires attached to the uP bus to fan out to some CMOS logic on a daughterboard. What's the the neatest way to...
6
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7 years ago
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6 | |
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AwardBIOS "Summary Screen"
I have a bunch of Neoware CA10 thin clients that I am configuring as diskless workstations for a class I'll be teaching this fall. In documenting my efforts, I've had to reference BIOS settings to...
11
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7 years ago
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11 | |
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Adding humidity to a temperature chamber
I need to do some environmental testing, including for humidity, inside a small temperature chamber. Humidity sensors are a dime a dozen, but how do you add humidity? I see the ultrasonic mist...
22
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7 years ago
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22 | |
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Canl 2N3904 handle 1200V?
No. (More specifically, a stack of ten. Which should avalanche at about 1200V, and it looked like it was working, for about a second. Then they all kacked and the current limiting resistor started to...
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7 years ago
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