Hobby Electronics Basics

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TDS410 questions

Once an event is captured (trigger has come and gone), I see a waveform fixed on the display. I presume this is the dig...
5 comments posted 16yrs
posted by gwprez
5 comments posted 16yrs posted by gwprez

basic TV question

Do all TV's have built in degaussing coils these days? I have a CRT style TV that's been in service for ~ 4 years and i...
12 comments posted 16yrs
posted by default
12 comments posted 16yrs posted by default

2 pin vs 4 pin bulb

What are the advantages of a 4pin vs a 2pin bulb..... the manufacturer of my task light used a 2 pin bulb but the socke...
0 comments posted 16yrs
posted by don
0 comments posted 16yrs posted by don

Looking for PS glitch with Tek scope?

I have a machine in that I suspect the PS (+24vdc) is sagging under load which is causing all kind of havoc with the di...
5 comments posted 16yrs
posted by gwprez
5 comments posted 16yrs posted by gwprez

Uncertain Capacitor Values

Hey folks, maybe somebody can help me figure this out. I was looking for a particular cap, and came to find myself a bi...
3 comments posted 16yrs
posted by fyberoptic
3 comments posted 16yrs posted by fyberoptic

lead vapor

Hi all, Silly question, but I thought I would check with the experts. On a different forum someone was asking about put...
12 comments posted 16yrs
posted by ggherold
12 comments posted 16yrs posted by ggherold

PIC micro uart puzzle

Can anyone suggest why the following is happening? I have two Pics, a '690 and a '2455, communicating via eusart (8-bit...
2 comments posted 16yrs
posted by randy.day
2 comments posted 16yrs posted by randy.day

measuring EMF

Hello, I would like to know if anyone know of a good performing EMF meter. mainly from 0 to 1Ghz under 200$. The only o...
9 comments posted 16yrs
posted by lerameur
9 comments posted 16yrs posted by lerameur

Question about LM334 current source

I would like to use the LM334 with 9V batteries to produce an approximate 3mA constant current through a diode. But I a...
3 comments posted 16yrs
posted by wthurt
3 comments posted 16yrs posted by wthurt

Sealed lead acid battery maintenance?

I would like to learn something about proper care of sealed lead acid (SLA) batteries. Is there any good authoritative...
17 comments posted 16yrs
posted by jdoe
17 comments posted 16yrs posted by jdoe

Difficulty identifying SMD semis via markings

I've never had to look up a SMD semi before now. Unlike JEDEC codes, these less-than-brief alphanumeric codes have no s...
15 comments posted 16yrs
posted by invalid
15 comments posted 16yrs posted by invalid

Resistor values with a PUT

From what I have read, the gate of a PUT is what determines its threshold voltage, so you would control that with two r...
1 comments posted 16yrs
posted by rocky.stevens
1 comments posted 16yrs posted by rocky.stevens

resistor value for LM317

usually a fixed resistor value of 220 ohm is used, with a 5k trimmer. Is there any problem if I use a 450 ohm resistor...
4 comments posted 16yrs
posted by l.cioria
4 comments posted 16yrs posted by l.cioria

Bode ploting

I am a Portuguese science student and although I am a little ashamed to be doing this question, I really need to do it...
1 comments posted 16yrs
posted by ana__valente
1 comments posted 16yrs posted by ana__valente