Latest threads in Hobby Electronics Basicsshow only best voted threads
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Tesing a 50M ohm 65KV resistor
So I have this monster 50M ohm 65KV resistor I got off ebay that I am trying to test. My fluke multimeter has max rating of 50M ohm and when I test the resistor it shows an open circuit. Do I need a...
8
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13 years ago
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8 | |
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Spice Issue: Current for in a RC Circuit with Sinusoidal Source
Hi, I am simulating the circuit given below using PSpice Student version and ngspice. A Capacitor Connected Across a Sinusoidal Source * vin 1 0 sin(0 1 1K 0 0 0) R1 1 2 1 C1 2 0 0.1m * .tran 1us 2m...
4
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13 years ago
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AC Adaptor can work as a charger
There were some that thought that an AC adaptor could not be used sucessfully as a battery charger. My experiment results: A sealed lead battery (UB1213) with an initial voltage of 9.7 V was charged...
15
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13 years ago
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15 | |
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Multiplication of Signals on SPICE's FFT
Make up a signal and some noise. Take the Fourier transform of both the noisy and clean signals on SPICE. Right click on the transform box to multiply the noisy signal by the clean signal. It lowers...
3
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13 years ago
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Disposable camera flash capacitor charging limit?
There is a tiny neon indicator in my disposable camera that flashes when the camera is ready to take a picture. Does the neon indicator limit the maximum voltage the photoflash capacitor can be...
5
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13 years ago
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5 | |
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9/10 Pin Motherboard Connector
Can anyone direct me to where I can pick up the 9/10 pin connectors that are used on cables that connect motherboards to USB ports? I need to find the housings as well as the pins, along with the...
5
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13 years ago
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5 | |
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Disassemble cordless drill PWM controller?
In a cordless drill (like the DeWalt DCD760), there is a finger grip trigger speed controller. Can that be skillfully taken apart without destroying it? I would like to remove the spring. Thanks.
7
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13 years ago
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7 | |
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Replace cordless drill speed control with simple on off switch?
I am powering a wheel to propel me on in-line skates. (see the powerful "roller cycle on grass" video on YouTube) Using a DeWalt 18 V cordless drill. If I want to replace the speed control trigger...
7
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13 years ago
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7 | |
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Rare Earth Elements
The pickup to my timing light is made from some kind of [ultra brittle] rare earth element. Is this $80/lb crap _really_ necessary? Where is Gauss when you really need him? China has everyone by the...
12
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13 years ago
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12 | |
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Infrared emitter and detector pair
I have a pair of these I'd like to use in a tachometer setup. The emitter is 13 to 15 mw output. The detector is 20 degrees angle of half sensitivity. The problem is that it's really hard to put a cog...
31
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13 years ago
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31 | |
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Analog non-sampled RAM for PCs
Hi: Has it ever been done that a PC has used analog non-sampled [i.e. continuous-signal] storage on magnetic discs for RAM? One advantage I see to this form of RAM is that once the information is...
11
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13 years ago
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[OT]Recording the sound of my heart with a stethoscope?
Subject is the topic. Anyone ever try it, or have suggestions how it might be done simply?
9
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13 years ago
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Led lighting ?
Recently , Our gorverment authorities, as part of a national pilot exercise on energy saving, replaced 16 unit of street " high pressure sodium lamps" with LED bulbs. The LED bulbs are said to have...
7
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13 years ago
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Taking Fractional Derivatives In the Frequency Domain
This is the launchpoint for the book _Calculus in a New Key_ by D. L. Orth. It sure SOUNDS interesting, but the noninteger derivative doesn't simplify anything I've ever worked on.
5
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13 years ago
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10 W Audio Amplifier Constructional Project!
Yes, actually there is a comment box below that post. You can put any comment and suggestion on how to improve the circuit. And also, feel free to browse my blog for more circuitry. Thank you.. =)
2
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13 years ago
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