Hobby Electronics Basics

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standing waves

We know what standing waves look like, on a string, or EM waves in a cavity. But what's the mathematical definition of...
8 comments posted 11yrs
posted by r_delaney2001
8 comments posted 11yrs posted by r_delaney2001

[OT] RadioShack declares bankruptcy

Nearly a century after it opened its first store and sent out its first catalog, RadioShack (RSHC) declared bankruptcy...
23 comments posted 11yrs
posted by toylet.toylet
23 comments posted 11yrs posted by toylet.toylet

Chinese Germanium 1N34

So I got a bunch of these from China for a couple dollars. How can I tell they are not fakes and does it matter if I'm...
74 comments posted 11yrs
posted by mhdpublic
74 comments posted 11yrs posted by mhdpublic

Serial Breakout Box

Looking for an inexpensive (less that $100) serial RS232 breakout box. Can set BAUD, etc and then receive serial data....
3 comments posted 11yrs
posted by Rolf
3 comments posted 11yrs posted by Rolf

OT: Shop trying to force a return

Since around mid-2014, Chinese manufacturer Xiaomi has been enjoying a huge success here in India selling mid-range mob...
3 comments posted 11yrs
posted by Pimpom
3 comments posted 11yrs posted by Pimpom

GLCD CM12864-2 wont work

Hi, II have a graphic lcd (Cm12864-2). Wandering if someone could help me out. The screen turns on and the backlight to...
2 comments posted 11yrs
posted by lerameur101
2 comments posted 11yrs posted by lerameur101

Capacitor as a power supply

This is more of a thought experiment triggered by handling of a huge cap. Would it be possible to charge a big cap and...
9 comments posted 11yrs
posted by mhdpublic
9 comments posted 11yrs posted by mhdpublic

Battery Selection

I need to run my laptop for many hours and in a mobile state; i.e. no AC Power available not car available. I have a En...
5 comments posted 11yrs
posted by OldGuy
5 comments posted 11yrs posted by OldGuy

Relacement for SCR

Have immediate needs for SCR for a latching alarm circuit. Unable to source locally. Only RS and they don't have them....
33 comments posted 11yrs
posted by strmbrgr2
33 comments posted 11yrs posted by strmbrgr2

Your favorite battery supplier or seller?

I'm impressed by the number of clearly illegitimate battery deals on Amazon. Some of them are obviously too good to be...
9 comments posted 11yrs
posted by always.look
9 comments posted 11yrs posted by always.look

Injection-Locked Oscillators

Where can I find a good tutorial on Injection-Locked Oscillators? All I can find are application-specific papers, and I...
9 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
9 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

Partial-Fraction Expansion?

Someone please refresh my memory... Isn't there some easy way to do a "partial-fraction expansion" of a transfer functi...
12 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
12 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon