Hobby Electronics Basics

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SMT 4017 and 555

Hi, I am here putting together SMT Kit for practice. Instructions which came with the kit are horrible. I have basicall...
9 comments posted 15yrs
posted by klaine8
9 comments posted 15yrs posted by klaine8

Filtering In Frequency Domain v Time Domain

A low pass time domain filter has a roll off. A low pass Fourier transform frequency filter can eliminate all the frequ...
54 comments posted 15yrs
posted by BretCahill
54 comments posted 15yrs posted by BretCahill

Converting 230V / 30A DC

Im using constant DC input od 230V / 30A and i need to convert this into 220V AC ( 50 hz ). What is the simplest way to...
6 comments posted 15yrs
posted by asd
6 comments posted 15yrs posted by asd

RF interference related question

Could some RF guru please clarify the following points ? Keeping in mind the ideas of co-channel interference, cross-ch...
12 comments posted 15yrs
posted by dakupoto
12 comments posted 15yrs posted by dakupoto

Exploding Transformers

Never heard of this problem before but 3 transformers that I know of have gone off in the past 2 years. I saw one from...
4 comments posted 15yrs
posted by BretCahill
4 comments posted 15yrs posted by BretCahill

Xantrex 600HD Battery Losing Charge?

I've had Subject battery for about 6 years and it doesn't really get used as much as years ago, but even that was not r...
10 comments posted 15yrs
posted by wolftracks
10 comments posted 15yrs posted by wolftracks

Frequency Domain Ramp

Taking a time derivative after an FFT would be easy on SPICE if you had some curve that would FFT into a ramp: Just mul...
35 comments posted 15yrs
posted by Bret_E_Cahill
35 comments posted 15yrs posted by Bret_E_Cahill

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 ratin...
8 comments posted 15yrs
posted by sinebar3770
8 comments posted 15yrs posted by sinebar3770

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 resul...
15 comments posted 15yrs
posted by chocolatemint77581
15 comments posted 15yrs posted by chocolatemint77581

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 o...
3 comments posted 15yrs
posted by Bret_E_Cahill
3 comments posted 15yrs posted by Bret_E_Cahill

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 th...
5 comments posted 15yrs
posted by sinebar3770
5 comments posted 15yrs posted by sinebar3770