Latest threads in Electronics Designshow only best voted threads
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Lockin' stuff up
Saw a PSA on the tube last night (I don't often watch TV so apologies if this is "old news"). Issue was basically: "lock up your Rx medications so folks living/visiting your home can't help themselves...
25
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7 years ago
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25 | |
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bad, better delay circuits
We want to trim the rising edge times of some pulses. The obvious circuit is a current source + capacitor linear ramp followed by a comparator. The first circuit here was the initial idea, seems...
35
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7 years ago
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35 | |
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Amplifier transistor substitution.
The smoke escaped from my old oscilloscope today. I've determined that it came out of R740, to the bottom right of the circuit diagram. This is because T711 has shorted out. Not very surprisingly I...
20
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7 years ago
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20 | |
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Where's the inductor?
Some relatively-powerful LED light sources, featuring integrated AC offline power supplies, are on eBay and Amazon, with descriptions like, 20W 30W 50W LED Floodlight COB Chip 110V 220V Input...
26
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7 years ago
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26 | |
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Triggering 12V electro lock
Would it be possible to trigger 12V electro lock with 5v relay that is connected directly to raspberry ? So, relay board would be powered from raspberry. GM
9
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7 years ago
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9 | |
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Sendin impuls --> relay --> schematics suggestion
Hi. I need to send one impulse that should simulate button press of some device. I can use 12V power supply for this electronics. The idea was to use 12 relay and NE555 to make this work. So this...
5
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7 years ago
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5 | |
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Couch + high humidity does solve problem.
A while ago I post a story here and other newsgroup about a couche generating static electricity and shocks and so forth. Now that air humidity is high this problem has basically disappeared. I...
8
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7 years ago
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8 | |
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Fail to amplify 27mhz rf using mosfet IRF843
I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to channel the 27mhz rf signal to the transistor gate, i...
20
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7 years ago
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20 | |
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Parasitics?
I'm running a simulation where I'm pumping charge into a capacitor to generate a voltage. A transistor emitter/source is connected to the positive rail and the collector/drain is connected to a 1 nF...
18
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7 years ago
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18 | |
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Tesla needs more cash
Burning a billion a quarter, that won't last long.
5
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7 years ago
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5 | |
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OT: The Infrastructure Boondoggle
Executive summary: the result of the $1 trillion "infrastructure plan" will be precisely nothing of note, just a bunch of sweetheart handouts to industry via tax breaks and "user fees", paid for by...
17
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7 years ago
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17 | |
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Re: OT: California RIP
When I moved to SF it was packed with great women and gay guys; boy, those were the days. But lately all the script kiddies and google bus types have flooded in, mostly males. If I were still in the...
1
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7 years ago
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Choke winding question
I was using a Ferroxcube calculator to work out some choke windings. These have to be multiple RM12, about 5mH and 2.5A DC, so I was looking at the maximum inductance before saturation for different...
18
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7 years ago
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18 | |
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Future Generations Need Not Worry About Climate Change
Because there won't be any future. The children of today are not going to make it to adulthood, and the grandchildren will never be born.
173
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7 years ago
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173 | |
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Antenna ferrite loopsticks verses air core?
Which is a better design. Suppose you have a 6 inch length of PVC pipe with numerous turns of wire that has an inductance of say 200uH. Now suppose you use the same (6 inch) piece of PVC with a...
239
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7 years ago
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239 |