Hobby Electronics Basics

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charger with constant current

Hello, I am attempting to charge a battery and I would like to have a feedback on the approach. I have a 18v supply com...
6 comments posted 18yrs
posted by lerameur
6 comments posted 18yrs posted by lerameur

Princeton scientists spy an electron dance

A team of scientists led by researchers from Princeton University has discovered a new way that electrons behave in mat...
0 comments posted 18yrs
posted by rakesh.raj34
0 comments posted 18yrs posted by rakesh.raj34

Chopper circuits for contactor coils

I am looking to reduce the power used by standard industrial 5 and - 12kw contactor coils and think that coil chopper c...
4 comments posted 18yrs
posted by colinstone
4 comments posted 18yrs posted by colinstone

Resistor Wattage?

I have a regen radio that uses one type 30 triode tube with 2.0 volt, 60 mA filament. The radio had two 33 ohm 1/2 watt...
3 comments posted 18yrs
posted by the1930s
3 comments posted 18yrs posted by the1930s

RF cooling -- so interesting!

Hi: Just how can microwaves be used to cool something? Usually they heat things up. http://www.sciencedaily.com/releases...
10 comments posted 18yrs
posted by glucegen1x
10 comments posted 18yrs posted by glucegen1x

activating reed switch

Hello, I made myself a small electromagnet to activate a reed switch using a 6v supply. The problem is that I am pullin...
9 comments posted 18yrs
posted by lerameur
9 comments posted 18yrs posted by lerameur

ELF radio needs more watts than MW radio?

Hi: I remember reading somewhere than ELF [Extremely Low Frequency] radio transmission is inefficient because it requir...
67 comments posted 18yrs
posted by glucegen1x
67 comments posted 18yrs posted by glucegen1x

Permanent magnet question

Hello, I have a permanent magnet and I just finish building myself a gaussmeter. However it shows me that every magnet...
6 comments posted 18yrs
posted by lerameur
6 comments posted 18yrs posted by lerameur

First project - stumped

I'm using Slone's Tab book to learn the basics. It's pretty good so far although once in a while the book takes bigger...
2 comments posted 18yrs
posted by huwdixon
2 comments posted 18yrs posted by huwdixon

My Thanks to Dave Platt

Thank you for the detailed answer to my question about re-activating a rooftop TV antenna. I have sent a copy of your an...
0 comments posted 18yrs
posted by none
0 comments posted 18yrs posted by none

Substitution possible?

Hi - newbie electronics learner here. I'm building a basic 12/24V power supply and one of the components called for is...
2 comments posted 18yrs
posted by huwdixon
2 comments posted 18yrs posted by huwdixon

Thermal jittering effects

Hai I donnot have any idea a bout how to reduce the thermal jittering problems.Even i donnot know how it will effects f...
1 comments posted 18yrs
posted by swapnapriya2020
1 comments posted 18yrs posted by swapnapriya2020

Question about transimpedance amplifier

As homework, i should design a transimpedance amplifier (with opamp) for photodetector's front end. I haven't any speci...
1 comments posted 18yrs
posted by lionelgreenstreet
1 comments posted 18yrs posted by lionelgreenstreet

As solar power is expensive why rely on it?

As extracting solar energy is expensive & the maintainance cost also is too high, what will be the future of solar proje...
4 comments posted 18yrs
posted by ramya334
4 comments posted 18yrs posted by ramya334

Re-activating a Roof-top TV Antenna

I would like to help a relative "re-activate" a roof-top TV antenna on a single storey house in southern California. Fr...
3 comments posted 18yrs
posted by none
3 comments posted 18yrs posted by none