Hobby Electronics Basics

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DIY variable voltage power supply

X-No-Archive: Yes The typical variable voltage power supply consist of a voltage control IC and multiple high power tra...
0 comments posted 22yrs
posted by dude17
0 comments posted 22yrs posted by dude17

identifying electronic components

I've got an old modem card here. I'd like to know what the various components do. Have you come across a site that iden...
1 comments posted 22yrs
posted by not_here.5.species8350
1 comments posted 22yrs posted by not_here.5.species8350

LED Formard current

Think of an optocoupler, e.g. ISP847 from http://www.isocom.com the MAX forward LED current as stated in the data sheet...
8 comments posted 22yrs
posted by GrahamIT
8 comments posted 22yrs posted by GrahamIT

Negative Voltage

Hey Everyone. I need to be able to generate a negative voltage from a microcontroller. To be more detailed, when the mi...
6 comments posted 22yrs
posted by Kev
6 comments posted 22yrs posted by Kev

2 comments posted 22yrs
posted by Unknown
2 comments posted 22yrs posted by Unknown

26 comments posted 22yrs
posted by Unknown
26 comments posted 22yrs posted by Unknown

4 comments posted 22yrs
posted by Unknown
4 comments posted 22yrs posted by Unknown

rf telemetry question

Ok, here's my situation: I have this project where I would like to do some remote sensing of 16-20 analog inputs, about...
3 comments posted 22yrs
posted by imbosol
3 comments posted 22yrs posted by imbosol

Ugly xfer function

Being a true masochist, I thought I'd try deriving the Laplace xfer function for this filter and it's getting ugly. Bef...
8 comments posted 22yrs
posted by reply2group
8 comments posted 22yrs posted by reply2group

NEC SoftCopy

Does anyone know of any National Electrical Code 2002 to download? Thanks Jack
0 comments posted 22yrs
posted by jl
0 comments posted 22yrs posted by jl

Q: DS18S20 + Pic

I have a DS18S20 connected to a pic, readings fluctuae on every read ie, 25.01 ,.10, .20, .06 etc, should the reading b...
1 comments posted 22yrs
posted by chrispol
1 comments posted 22yrs posted by chrispol

Decrementing a four digit counter?

I have built a four digit counter using an Allen Bradley photoswitch which clocks four 74190s (Up/Down Decade Counters)...
3 comments posted 22yrs
posted by zuckuss
3 comments posted 22yrs posted by zuckuss

transistor failures

We have a remote outdoor sensor that is prone to failure (nearby lightning we suspect). It is only a couple transistors...
3 comments posted 22yrs
posted by none
3 comments posted 22yrs posted by none

high resistance switch question

HI guys, I'm looking for a bit of newbie advice re. switching circuits. Basically I'm trying to create a book which can...
5 comments posted 22yrs
posted by hal_leemuxNOSPAMPLEASE
5 comments posted 22yrs posted by hal_leemuxNOSPAMPLEASE

Need help building a high temperature sensor

I'm looking for information on how to build a high temperature sensor for the HAI Omni Pro II home automation controler...
0 comments posted 22yrs
posted by reply
0 comments posted 22yrs posted by reply