Latest threads in Hobby Electronics Basicsshow only best voted threads
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filtering a digest?
Is there any way I can filter out messages from a digest? I don't need instant updates from this forum, so I get it in digest form, and I'd like to be able to get the digest, with certain messages...
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15 years ago
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i need toknow?
i need to know semiconductors.
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15 years ago
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PCB current capacity
Can someone tell me how much current a 1mm wide trace on a PCB can handle? Thanks Rod
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15 years ago
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Making a 2 Volt 400 Amp bridge rectifier?
The 400CNQ center tap, high current, Schottky rectifier module series has been optimized for very low forward voltage drop, with moderate leakage. The proprietary barrier technology allows for...
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15 years ago
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Caps for Short Term Mobil Energy Storage
Some dreamer once wanted to use "super" capacitors to power a road EV but the energy density is still too low. By one calculation a 100 ton cap would be necessary to store the energy in a 15 gallon...
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15 years ago
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Explanation of Parallel Resistor and Diode
I had difficulty choosing keywords to narrow the search enough to give me any solid hits for this, and I hope this question isn't too advanced for the basics group. I'm looking at a full-bridge IGBT...
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15 years ago
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How can I inspect AC mains signal on my +/-5v scope?
I need to find a way to couple the AC mains signal to my low voltage scope input. I'm adjusting a rotary spark gap and need to get the "bangs" on the up and downswing of the AC cycle. Is there...
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15 years ago
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Circuitest 2000S and 2100 scanner
Hello everyone, I'm new to this group and would like to ask your help regarding this Circtuitest 2000S. This has been sitting idle since I bought it from a second hand shop. I don't know how to use it...
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15 years ago
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Switch 3A with a small reed switch
Hi there, I'm wanting to switch around 3A using a reed switch (eg with the aim of driving a SSC P7 LED. Source voltage will be be around 3.7v (Li-ion) and the max current through the LED will be 2.8A....
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15 years ago
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Resistor grid puzzle
Imagine a rectangular grid of 1 ohm resistors, 3 on a side like this: A ___ ___ ___ |-|___|-|-|___|-|-|___|-| .-. .-. .-. .-. | | | | | | | | | | | | | | | | '-' ___ '-' ___ '-' ___ '-'...
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15 years ago
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power factor correction on laptop power supplies
Do typical modern power supplies for Dell, HP, Gateway, etc. laptops employ power factor correction? Michael
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15 years ago
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UPS for 12V DC ?
I am looking for some ideas. I have an answering machine runnning off a 12 VDC transformer. Whenever power goes out, I have to turn it back on. (Recording is still kept) It draws 200 ma of current...
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15 years ago
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Calcutlating adaption of loudspeaker filter circuit
Hello to all of You, Some time ago I decided to built myself a good speaker set for my computer. I have already built two Visaton CT Center 81's ( they sound great but need a subwoofer which is the...
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15 years ago
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power supply mods
I've finished the standard "build yourself a adjustable power supply" project and some small others. I was looking at this: I'd like to try this and was wondering about actually adding it to the power...
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15 years ago
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More Compromised Reasoning
But the correct calculation necessarily includes the cost of diesel. You tried to "merely" omit the entire reason for the electric tractor. . . . Hardly. Not when your reasoning ability is...
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15 years ago
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