Latest threads in Hobby Electronics Basicsshow only best voted threads
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Remote controlled flashlight?
I would like to be able to turn a flashlight on and off with a wireless remote from about 20' away (or so). I figured if I get one of those big plastic flashlights with the 6 volt battery there should...
15
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13 years ago
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15 | |
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Ping JB (ThinAirDesigns)
JB, I posted the following a while back, but haven't seen a reply. Maybe I missed it or maybe you missed my post? "While I've got your attention: Maybe it's just me but, with no rancor intended,...
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13 years ago
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1 | |
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unstable opamp ringing oscillating and such
can anyone in here explain why a OpAmp could oscillate or become unstable if there are 2 poles before it reaches 0dB on a plot of gain vs frequency? Here's what I've gathered thus far... there's a cap...
18
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13 years ago
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18 | |
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Why such wide price difference in fuses?
I was looking for a 0.75 to 0.8A fuse for a PSU I've built and there's a very wide price difference in what seems to me to be similar fuses. I've been curious as to why this is the case for a while....
4
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13 years ago
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4 | |
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Device on cable
Cables which connect USB ports with peripherals such as cameras frequently have black cylindrical objects on the cables a few centimetres away from the USB end. These may be about 10mm in diameter and...
4
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13 years ago
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4 | |
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Correcting for Impedance Errors w/o Superposition & FFT
If you already have the frequency response of the impedance of a circuit over a bandwidth, it should be possible to largely correct for differences in the reactance of a similar but...
2
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13 years ago
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2 | |
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Are rechargeable ALKALINE CELLs still available?
Some called 'grandcell' which I've used for 2 years need to be replaced, but they've gone off the market here. Have these [made in Malaysia] been banned, or what ? ==TIA
9
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13 years ago
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9 | |
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Cordless drill power supplying scooter motor?
Does this sound right? drill battery and controller no-load driving the drill motor lowest-speed 1 amp full throttle 2.8 amps driving the scooter motor lowest-speed 1.5 amp full throttle 10 amps What...
2
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13 years ago
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2 | |
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LCD Without Wire Connectors
I have a Radio Shack count-up/count-down timer, catalog #63-878. It's about 2.5"x3.2"x0.70" thick. It's around 10 years old and some of the input keys had become sticky. I had to remove the back, then...
4
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13 years ago
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4 | |
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analog switch
How can design analog SPDT switch which switches VCC between +3.3V and 5V depending on application? I've an available pin on micro which can select the VCC. There are some ICs available to do this job...
21
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13 years ago
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21 | |
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36v power tool motor to replace scooter motor?
Does this sound right? motor shaft revolutions per scooter wheel revolution 8.15 wheel circumference 39.27" wheel movement per shaft revolution 4.82" motor shaft revolutions per minute (estimated)...
5
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13 years ago
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low frequency amplification
Hello, I have a question about where do frequencies end and pulses start? I'm trying to make an impact detection circuit, I have some sensors on a mat, and when something strikes the mat I get a small...
11
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13 years ago
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11 | |
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Voltage Reflection Coefficient Question
In Wes Hayward's book "Introduction to Radio Frequency Design" on page 116, the voltage reflection coefficient is given as gamma = V-/V+ = (z-1)/(z+1) where z is the normalized impedance, Zin/Z_o. As...
2
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13 years ago
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Linearily of Derivative Circuits At High Frequency
To get to a higher frequency, is it possible to just use a smaller cap and/or resistor on op amp derivative taking circuits? Bret Cahill
21
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13 years ago
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21 | |
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Convert Bits/sec to Hz
I understand that they are different domains (Hz - analog and bits/sec - digital), how would one convert e.g., 1Gbit/s to corresponding Hertz frequency ?
18
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13 years ago
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18 |