Latest threads in Hobby Electronics Basicsshow only best voted threads
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need help selecting a transmitter and reciever
ok, basically I want to turn on and off an analog switch wirelessly. The range I need is very short... maybe around 20ft. And I need a transmitter as small as possible, and hopefully can run on a...
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15 years ago
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Why use amplifier with adc?
I don't know very well how adc works, so i have a question. Most adc have a Vref pin that defines Vin range of adc. Vin range of adc is then divider for 2^n (n=resolution) to obtain LSB. If i resize...
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15 years ago
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Electrifying the Interstates
Overhead wires would be pretty ugly so they'll have to install rails / wires in the pavement. The problem of metering usage is left to the student. Bret Cahill
5
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15 years ago
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Question - 9v Battery Heating in simplest circuit
I'm a noob doing some projects with the arduino development environment and learning as I go. I have a problem with a very simple test circuit I made on a breadboard consisting of a 9v battery, some...
20
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15 years ago
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recommended reading for audio amplifier design?
I was about to buy Randy Slone's book, but these stopped me in my tracks: So, what books are recommended for beginners? In particular I'm curious about mosfet amp design, but I'll also look into...
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15 years ago
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Cleaning a BNR Connector
I have a female BNR connector that I think needs oxidation removed from inside. It's a bit too tight for emery paper. Any suggestions? -- W. eWatson (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)...
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15 years ago
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the theoretical formula for calculating the Equicalent Resistance of the Complex Resistance Network
hi, everyone! I have found the theoretical formula for calculating the Equicalent Resistance of the Complex Resistance Network. If you are interested, please visit this page( which is a Chinese...
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15 years ago
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attenuation pad
Hi there I have a recording studio and i am using a stage box to take multiple microphones into one multicore to pl;ug in to my mixer in a different room. Because i am using a relatively cheap mixer,...
2
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15 years ago
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LM317 schematics
In the LM317 documentation ( there are schematics that show for example R1 of 240. Is that 240 ohms or 240K ohms? Thanks! Joe
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15 years ago
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Electronics Distance Learning
Hi all, I've just completed some basic Scottish Vocational qualifications in electronics and I want to continue with a decent distance learning course towards HNC. Can anyone recommend a UKcollege...
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15 years ago
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Converting 7v DC to 7v AC at 50-60Hz
Hello, I have hacked a clockradio and i need to supply it with power from a 12v battery. How do i invert DC to AC?
16
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15 years ago
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Question on phone cord connectors
If the connector for the phone line coming from the wall is an RJ-11, what connector is used for the coiled cord connecting the handset to the telephone? It seems a little smaller. Any help is...
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15 years ago
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how to separate ground potential
Hi, I have to design a printed circuit board for a high-voltage environment. Hence, the "ground potential" of the board has to be on 4 kV. Du to the fact that the absolute potential values don't...
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15 years ago
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A useful website for LED array design
Hey folks!! I just created a website for those of you interested in creating LED arrays. It will calculate the resistors values and design the circuit for you. Check it out here Your feedback is...
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15 years ago
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audio amplifier output transistors
I noticed that TR7 is PNP and TR9 is NPN here: Then over here, TR7 is NPN and TR9 is PNP: Are these correct, or in error? Also - for building audio amps "on the cheap", would TIP41C/TIP42C do for...
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15 years ago
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