Hobby Electronics Basics

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Mosfet as a 12V Switch (and opto)

I've been stuck on this for awhile. I've got a MOSFET that is not behaving the way I expect. I was hoping it would act...
8 comments posted 19yrs
posted by ProgrammerChicago
8 comments posted 19yrs posted by ProgrammerChicago

SMT equivalent or better to the 2n3904?

Can anyone recommend a SMT equivalent or better to the 2n3904? Either they don't make 2n3904 in SMT or Digikey doesn't...
4 comments posted 19yrs
posted by spamme
4 comments posted 19yrs posted by spamme

Why to learn Algebra II

I am looking for a person to talk via video conferencing to my Algebra II class "Why to learn Algebra II? When will I re...
19 comments posted 19yrs
posted by amant1
19 comments posted 19yrs posted by amant1

Question: Choosing/Using an SSR

I'm working on a circuit to replace a wired remote control unit with an RF remote. The existing remote is nothing more...
4 comments posted 19yrs
posted by chris_trottier
4 comments posted 19yrs posted by chris_trottier

Perforated Emitter technology

I recently came across the data sheet for the MJL21193/4 series of transistors for linear amplifier applications, http:...
11 comments posted 19yrs
posted by jpopelish
11 comments posted 19yrs posted by jpopelish

Off turns ON

Point 1: I wanted to build a simple device to tell if a single leg of a 240Vac 3-phase machine is dropping out momentar...
4 comments posted 19yrs
posted by bborb_at_fuse.net
4 comments posted 19yrs posted by bborb_at_fuse.net

Level Converter

How can one convert one level to another in the simplest manner? I have one device that works on 2.5V and another that...
11 comments posted 19yrs
posted by Jon_Slaughter
11 comments posted 19yrs posted by Jon_Slaughter

Thank You

Thanks for all the ideas. I will disassemble and post results as soon as I can... (JF, I see the Ohm symbol on my post,...
1 comments posted 19yrs
posted by NeeekUsenet
1 comments posted 19yrs posted by NeeekUsenet

LEDs

Hello I need to know about controlling current through LEDs in order to control the illumination I've searched, but all...
3 comments posted 19yrs
posted by azza.alhilali
3 comments posted 19yrs posted by azza.alhilali

Clueless beginner's AC dimmer circuit

Is it possible to dim an AC lamp with a single resistor? I want to dim the tiny lamp that lights the ring surrounding t...
5 comments posted 19yrs
posted by NeeekUsenet
5 comments posted 19yrs posted by NeeekUsenet

How to explain this ?

I had seen some DZI from TIBET that are selling for ten to twenty thousend SIN dollars. The art grain pattern of the DZ...
5 comments posted 19yrs
posted by mowhoong
5 comments posted 19yrs posted by mowhoong

tek 2236 reapair advice ?

so i received my tek 2236 opt 2 scope (**for repair**) from the bay advertised as showing flickering lights when "beam...
0 comments posted 19yrs
posted by some
0 comments posted 19yrs posted by some