Hobby Electronics Basics

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effect of reverse b/e current over time

I'm looking at using an astable multivibrator, like the one in the diagram at this link http://www.play-hookey.com/digi...
9 comments posted 21yrs
posted by kellrobinson
9 comments posted 21yrs posted by kellrobinson

EPROM to RS232

I'd like to build a handheld unit that will send what is on an EPROM over RS232 to a PC. I'll program ASCII characters...
5 comments posted 21yrs
posted by consultec
5 comments posted 21yrs posted by consultec

555 timer IC toys for children with disabilities

Hi, can any one help? I,m just teaching myself basic electronics and have built a hobby kit (9V) using a 555 timer to t...
9 comments posted 21yrs
posted by goldenopaltree
9 comments posted 21yrs posted by goldenopaltree

What is ethernet isolation tansformer

Hi there, Why are they used.....the one which you can find in almost all ethernet cards!! Thanks
6 comments posted 21yrs
posted by nospam4u_jack
6 comments posted 21yrs posted by nospam4u_jack

12V DC voltage stabilizer

I'm looking for a circuit diagram for 12V DC voltage stabilizer for my car. I found that every time when I start my car...
2 comments posted 21yrs
posted by hechong
2 comments posted 21yrs posted by hechong

multivibrator

How is a multivibrator different from an oscillator? Is it that a multivibrator generates square waves only (two-state)...
4 comments posted 21yrs
posted by benn4321
4 comments posted 21yrs posted by benn4321

UCN5804 O/P series diodes

Hey guys, if you look at the datasheet of Allegro's UCN5804 typical application shows 4 diodes in series from the 4 o/p...
2 comments posted 21yrs
posted by navdeep2u
2 comments posted 21yrs posted by navdeep2u

UC3854 PFC problems

I am working on UC3854 PFC. Input is 80-250V, 50Hz, output is 385V dc. Everything is made like on 250W pfc preregulator...
9 comments posted 21yrs
posted by spirit810
9 comments posted 21yrs posted by spirit810

Help to identify inductor

Does anyone know what type of inductors these are what value they might be? http://reactivecomputers.gotdns.com/Inducto...
3 comments posted 21yrs
posted by apl2research
3 comments posted 21yrs posted by apl2research

How to calculate the peak inductor current?

Could someone clairify these equations to calculate the peak current reached in an inductor when a capacitor is dischar...
12 comments posted 21yrs
posted by nomtrxspam
12 comments posted 21yrs posted by nomtrxspam

replace caps on motherboard issue

i have a dead mobo that has domed caps, not worth sending off but worth an attempt at repair i am amateur solderer i ha...
7 comments posted 21yrs
posted by not
7 comments posted 21yrs posted by not

Torque and slowing down an AC motor ?

I'm wanting to slow down occasionlly a bandsaw we have. I've already used an idler pully to slow it down so that it is...
0 comments posted 21yrs
posted by clannorm
0 comments posted 21yrs posted by clannorm

American Inventor (Idol)

The creators of American Idol are working on a new program called American Inventor. It'll feature inventors and the fi...
1 comments posted 21yrs
posted by wolf_tracks
1 comments posted 21yrs posted by wolf_tracks

DC Choke

I am looking for a DC choke that will handle roughly 10A continuous, and is ~ 150uH (100uH to 200uH). I'm not sure wher...
4 comments posted 21yrs
posted by xxragexx
4 comments posted 21yrs posted by xxragexx