Hobby Electronics Basics

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NB2L (Li-Ion) battery intrinsics

Hi people. Preparing a trip in a country without electricity, I purchased a series of NB2L (equivalent) batteries for m...
2 comments posted 20yrs
posted by agricolus
2 comments posted 20yrs posted by agricolus

Patent Granted for Tesla's Perpetual Motion Device

See Utility Patent # 6362718. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/s...
7 comments posted 20yrs
posted by BretCahill
7 comments posted 20yrs posted by BretCahill

Antennas

I have concuded somewhere regarding Electricaly short antenna. I just want to mention it to see if my conclusions are c...
12 comments posted 20yrs
posted by papageorgiou40
12 comments posted 20yrs posted by papageorgiou40

RS232 Level Correction

What's the best way to compensate for RS232 levels that are out of spec? The absolute levels I'm getting are around 9.1...
18 comments posted 20yrs
posted by nobody
18 comments posted 20yrs posted by nobody

Adding Text to Live Video

I want to make a device that will take in live video add some text and output it with the text, the text will be Line 1...
2 comments posted 20yrs
posted by tux
2 comments posted 20yrs posted by tux

Long distance education

Im new to the group. Hello to all. Is anyone here involved in long distance : electronics education?
1 comments posted 20yrs
posted by mark
1 comments posted 20yrs posted by mark

door alarm kit

hi you'll have to forgive my ignorance here but it has been a long time since i did my gcse in electronics nearly 20 ye...
7 comments posted 20yrs
posted by donotreply
7 comments posted 20yrs posted by donotreply

lamp or lantern?

what is the difference in definition and in connotation, between a "lamp" and a "lantern"?
32 comments posted 20yrs
posted by dances_with_barkadas
32 comments posted 20yrs posted by dances_with_barkadas

looking for a 555 timer circuit

I'm looking for a circuit that would utilitize a 555 or similar that will have 3 120VAC outputs that it alternates betw...
43 comments posted 20yrs
posted by waynelewis
43 comments posted 20yrs posted by waynelewis

Voltage of In-car charger for MP3 player

I have an MP3 player and the mains charger delivers 5V, 2.4A. The manufacturer's "proper" in-car charger has the follow...
4 comments posted 20yrs
posted by JJBloggs
4 comments posted 20yrs posted by JJBloggs

Sony Magic Gate Memory Cards

Hello, I hope you can help here. I've just started working for a new employer and one of the first projects I have is t...
13 comments posted 20yrs
posted by retro
13 comments posted 20yrs posted by retro

Driving transistor from HC273

Do I need a resistor when driving a transistor from a HC273? It will be on for 1ms and off for 10ms. Transistor will be...
46 comments posted 20yrs
posted by grant
46 comments posted 20yrs posted by grant