Latest threads in Hobby Electronics Basicsshow only best voted threads
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QUESTION: How to connect a power supply to my home power grid?
Hi all I wanted to ask a question about something that has lightly perplexed me for a while. Sometimes we read about some person building e.g. a wind turbine (or something else) and connecting the...
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14 years ago
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Missing Group?
Anybody know why the "Deacticated" the Communications Units Group on Google?
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14 years ago
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native cad file in ASCII
Dear all I have developed a binary circuit using ultiboard and how can i generate Gerber files and native cad file in ASCII. from the ultiboard program or the Gerbtool program. what is native cad file...
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14 years ago
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Lock In Amplifier Ain't Anywhere Close To the End of the Signal Recovery Road
It's still the wild west out in info land. Lots of opportunities. Bret Cahill
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14 years ago
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power losses across inductive chokes
The DC component losses from I^2 * R end up as heat in a choke. I've received some mixed signals about the AC reactance component of the impedance of the choke. One theory, is the energy in the...
12
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14 years ago
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Crest factor?
I see this term in specs for UPS's. Wikipedia describes it as a ratio of RMS to peak voltage. That doesn't "grok" for me. Help me understand what it means re. a UPS whose output is spec'd to be sine...
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14 years ago
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Source for flickering LED's
Does any one have a source for flickering not flashing LED's? I'm looking for the ones that are in flameless candles. I need to make a flickering flashlight like a fire. The ones that you get at...
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14 years ago
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simple audio/video switch
Hi, I have a cable box with three pins on the back, constant 9VDC, GROUND, and 3VDC(when switched by remote, normally 0VDC). I want to use the GROUND and the 3VDC to switch RCA style Video and audio...
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14 years ago
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electronics
i want some basic kno.. about electronics.... how the electronics chips working and whats the basic reqarnment for it....????
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14 years ago
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boost PFC duty ratio expression
Anyone has some idea how can i derive the expression for the small signal duty cycle for boost PFC designed for average current mode control. thanks.
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14 years ago
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Diode across inputs to solenoid?
I was looking at the solenoid on a contactor today. It had a diode across the two leads and I've been wondering why. The contactor is used to turn on a Miller mig welder. Its rated for 120Volts. I...
1
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14 years ago
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Crystal Radio Questions
I'm winding a coil for a crystal radio. The original plan says to wind the antenna coil on top of the tuning coil, whereas another version says to wind the antenna coil *adjacent* to the tuning coil,...
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14 years ago
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rechargable batteries for solar lights
I'm generally OK with electronical things, but hardly an expert on rechargables, from reading the posts here. So, thanks in advance; here's the question: Like a lot of folks, i have a pile of those...
7
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14 years ago
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cm choke for blocking oscillator
I want to take 1.5 volts and boost it to 5 volts. Don't need a lot of power, maybe 100mW. Common mode chokes are cheap and readily available. Do people ever make blocking oscillators out of them? I'm...
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14 years ago
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electric latch
Hi I have a one touch electric can opener (that no longer works). How it (used to) work: -Place on a can -Press switch (momentary) From there on it turned and cut off the top of the can and stopped...
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14 years ago
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