Hobby Electronics Basics

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Telephone Spammers

I just experienced a telephone spammer who sent my own telephone number as the CID! Anyone else experienced that? Since...
9 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
9 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

Why won't my meter check this?

I have a DVM made by Extech that has the diode check function. When checking a regular diode the function works. But wh...
27 comments posted 12yrs
posted by etpm
27 comments posted 12yrs posted by etpm

Interesting Simulation Problem

Lots of bad-mouthing about simulation of circuits, but here's a real world problem for you... Suppose you have a circui...
34 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
34 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

OT: Fastener Question

Does such a fastener exist... I want to snap a steel bar over these "pegs" but with a quick push-to-release feature. Th...
22 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
22 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

IF Statement Notation

Anyone know how to interpret this IF (I think) statement... PMI=(PM>=0)?((PM==0)?1000:PM):PMC it's in a notation-style...
9 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
9 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

Why is it?

Why is it that electrolytic caps have a line marking the negative lead but the circuit board they get soldered into has...
7 comments posted 12yrs
posted by etpm
7 comments posted 12yrs posted by etpm

OT computer question

How come if you want a video card for a Windows desktop you are looking at something that eats a lot of power and often...
4 comments posted 12yrs
posted by default
4 comments posted 12yrs posted by default

OT: Best DVD Burner SOFTWARE?

OT: Best DVD Burner SOFTWARE? My CyberLink Power2Go software has decided to go strange on me and only allow me to add o...
17 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
17 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

Isolating cause of mains interference

The *root* cause is plainly the set of fluorescent lights in the garage being switched on or off (or both) via a simple...
7 comments posted 12yrs
posted by terrypingm
7 comments posted 12yrs posted by terrypingm

Does this device exist?

I'm looking for some type of semiconductor device that has a very high impedence gate that is OFF when high enough volt...
9 comments posted 12yrs
posted by etpm
9 comments posted 12yrs posted by etpm

Meaning of Vce(sat)?

I'm going to be using ULN2803APG in a design of mine, and I just noticed on the datasheet [1] that Vce(sat) typ is 1.3...
18 comments posted 12yrs
posted by newsgroup.nospam
18 comments posted 12yrs posted by newsgroup.nospam

over voltage protection

Can any kind person advise me of a simple way to provide over-voltage protection on a 12V DC PSU? The current drawn by...
16 comments posted 12yrs
posted by bill
16 comments posted 12yrs posted by bill

Another old Pioneer SX-434 question-speakers

Thanks to all those who replied to my last questions about my old SX-434. I have done everything advised except actuall...
3 comments posted 12yrs
posted by etpm
3 comments posted 12yrs posted by etpm