Latest threads in Hobby Electronics Basicsshow only best voted threads
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Simplest circuit to drive a 24V DC motor from the mains?
Hi, let's say that I have this hypothetical motor that is rated for 24V DC and draws an unknown amount of current (say around 1A). Input is 230V AC. I'm wondering if the motor will work properly with...
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14 years ago
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14 | |
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why does a car battery spark
I'm trying to figure out what are the paramters that cause a spark.... a visible spark. For example, if I take a 9V battery and connect the leads together with a small wire, no spark... I imagine if I...
118
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14 years ago
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118 | |
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Battery Pack Dead
Anyone know why a 24 Drill battery pack would read 0mV overall and for every NiCd cell? No open cells since the total resistance is about 2.5 Ohms. I didn't know cells could discharge completely to 0V...
5
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14 years ago
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5 | |
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need a quick ultrasonic noisemaker
For the neighbor's dog. Heard about the ultrasonic noisemakers that are triggered by a dog's bark, but at $50 and several unfavorable comments, thought I'd try to roll my own. Aiming for 16-20 kHz. In...
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14 years ago
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Understanding simple voltage divider
Hi I understand the mathematical equation for voltage dividers I just don't understand why the voltage drops ... Can anybody explain or point me to something that will John
11
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14 years ago
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11 | |
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B&K 4007DDS sweep generator
Anyone familiar with this or 4013DDS? Normally, one can read the manual for a product before buyng to get a pretty good idea of what it can do but in this case the manual is far from being...
30
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14 years ago
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30 | |
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Potential of a capacitor at each terminal
Hi, I've come across a question concerning the following circuit: - Voltage Source: Node 0, Node 1. (Voltage Vmax) - Resistor 1: Node 1, Node 2. (Resistance R1) - Resistor 2: Node 0, Node 3....
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14 years ago
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Does A Simple Cap Filter Amount To An Exponential Running Average?
The capacitor is between the output and ground. Bret Cahill
7
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14 years ago
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7 | |
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sampling 240VAC
I'm looking for the best way to sample the 240VAC waveform from a powerline well staying within my design constraints. I would like to go transformerless because of size requirements and I would like...
34
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14 years ago
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34 | |
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dB and sound pressure
I can't quite grasp the connection between microphone sensitivity and sound pressure level. I am trying to use a plain electret microphone to detect a BB gun bullet breaking through the paper target....
13
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14 years ago
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13 | |
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Load panel terminology: stab?
It's used in a load panel sticker that says something like "do not put more than 150 amps on one stab". What's a "stab"?
32
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14 years ago
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32 | |
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OP-Amp and A-D Question
Let's say, for example, I have an Op-amp set up with a gain of 1, if I have 2.5V at the - input and 2.7V at the + input, would the output be 0.2V or 2.7V? If 2.7V, how do you set this up for an A-D...
7
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14 years ago
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[OT] How Does Craig's List Derive Money for Its Service?
Yep, I understand they have no fees. If so, how do they survive?
6
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14 years ago
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6 | |
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Alligator Clip Cable for Signal Generator
Long ago I lost the alligator coax cable with a BNC adapter on the other end. I recently found a coax, 75 ohm?, with an end missing. It's certainly not the original, but, if I just use the shield and...
5
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14 years ago
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Signal Processing Via USB Port
If all you have to do is buy a $200 netbook, an A to D converter and download some software isn't it a waste of time screwing around with circuits? Bret Cahill
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14 years ago
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26 |