Hobby Electronics Basics

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Flip Flops

I have a comp sci degree, and something that was never explained were flip flops. I never understood on a chip how swit...
26 comments posted 21yrs
posted by neutron
26 comments posted 21yrs posted by neutron

+/-15 linear PSU - 2x15V or 2x18V transformer

I think that you could use a 2 x 15V transformer for a +/-15V linear PSU. The LM317 and LM337 need Vin to be 3V above V...
3 comments posted 21yrs
posted by cheney
3 comments posted 21yrs posted by cheney

Multimeter functioning [newbie question]

Hi, total newbie to electronics, I just built a kit which worked first go fortunately for me, all I basically understoo...
9 comments posted 21yrs
posted by neutron
9 comments posted 21yrs posted by neutron

MOSFET built in bypass diodes?

I have IRF1404 and IRF4905 hexfet/mosfets. Do these have built in drain-source reverse voltage protection diodes? Looki...
1 comments posted 21yrs
posted by user
1 comments posted 21yrs posted by user

Q:Triac Switch

http://www.chrisncarol.com/switch.jpg would this be ok, basically when the 555 is high load1 is active when it's low loa...
4 comments posted 21yrs
posted by chrispol
4 comments posted 21yrs posted by chrispol

What fuse to use

I have a 12v timer/relay powered by a 12v marine battery. Timer is powered by battery and has a relay that passes throu...
7 comments posted 21yrs
posted by patgowa
7 comments posted 21yrs posted by patgowa

I am an ASCII-ART virus

| | 8888 8888888 | 888888888888888888888888 | 8888:::8888888888888888888888888 | 8888::::::8888888888888888888888888888...
1 comments posted 21yrs
posted by nospam
1 comments posted 21yrs posted by nospam

Detecting IR frequencies

I want to give my bedroom the special treatment for CHRISTmas and decorate it up. I have one of those Wild Planet (the...
8 comments posted 21yrs
posted by ngdbud
8 comments posted 21yrs posted by ngdbud

Powering a relay

OK, I have a real basic question.... I have an embedded computer. It had digital I/O. Per the manufacturer, "When the D...
15 comments posted 21yrs
posted by yan
15 comments posted 21yrs posted by yan

led optical efficiency Vs forward current

Hi all, in a led, is it possible that the optical efficiency (lumen/watt) is lower at the growing up of the forward curr...
0 comments posted 21yrs
posted by mauri236
0 comments posted 21yrs posted by mauri236

68HC11 & Code Performance

Hi, I'm trying & debugging a little software wrote by me and some other friend of mine in 68HC11 Assembly code. Now I'd...
12 comments posted 21yrs
posted by richi.rasega
12 comments posted 21yrs posted by richi.rasega

Pot resistance - 473 ?

I have a broken pot with 473 written on one side - is this 4.7K or 47K ? I always forget. :) Thanks
13 comments posted 21yrs
posted by max-man
13 comments posted 21yrs posted by max-man

Timer Circuits or PIC

I am working on a project where I am going to be controlling a number of rams. These are triggered using solenoids. I a...
16 comments posted 21yrs
posted by rob
16 comments posted 21yrs posted by rob

Flashing LED circuit

Dear All, Please can you advise on the wiring of a flashing LED circuit. I want to connect 5 off 10mm red flashing HE L...
8 comments posted 21yrs
posted by nick
8 comments posted 21yrs posted by nick