Hobby Electronics Basics

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current mirrors and LED matrix driving

Okay. So I've been considering current mirror design and, in particular, the idea of applying resistors on either or bo...
14 comments posted 13yrs
posted by jonk
14 comments posted 13yrs posted by jonk

Cheap digital logic?

So, I have this algorithm. It's pretty simple. It works well on an MCU, which is fine and all, but if I could make it c...
8 comments posted 13yrs
posted by newsgroup.nospam
8 comments posted 13yrs posted by newsgroup.nospam

Edison - Tesla Rap Video

http://www.youtube.com/watch?v=gJ1Mz7kGVf0&sns=em
0 comments posted 13yrs
posted by BretCahill
0 comments posted 13yrs posted by BretCahill

Automobile starter lockout

Not looking for help (this time). Just wondering how simple it would be to design a logic circuit so that you car start...
61 comments posted 13yrs
posted by ivanvegvary
61 comments posted 13yrs posted by ivanvegvary

Talema toroidal transformer

I have a toroidal transformer. It is marked: Talema TVR 2518 7702-P2S2 486 I have failed to find a data sheet using Goo...
29 comments posted 13yrs
posted by jckipper
29 comments posted 13yrs posted by jckipper

OT: cordless screwdriver

Is anyone familiar with the cordless screwdriver in the link or a similar one? I'd like to know if using rechargeable 1...
12 comments posted 13yrs
posted by pimpom
12 comments posted 13yrs posted by pimpom

Help explain strange behavior of my circuit?

Hello. So, I noticed something strange with my circuit, and while I can "work-around" it, I'd like to understand what's...
8 comments posted 13yrs
posted by newsgroup.nospam
8 comments posted 13yrs posted by newsgroup.nospam

*analog* brushless DC motor control?

My son and I took apart a dead hard drive, and salvaged the motor. Apparently it's a brushless DC motor that needs a de...
19 comments posted 13yrs
posted by mrdarrett
19 comments posted 13yrs posted by mrdarrett

5x7 LED matrix driver

I'm considering a 5x7 LED digit module design to work with a microcontroller with these two simple ideas: (1) Constant...
28 comments posted 13yrs
posted by jonk
28 comments posted 13yrs posted by jonk

Stepper motor controller help please

I recently acquired a programmable stepper motor controller. It was made by Richmill Manufacturing Company Ltd. around...
7 comments posted 13yrs
posted by etpm
7 comments posted 13yrs posted by etpm

Phone in use circuit not working

I tested and built the following circuit. http://www.circuitstoday.com/telephone-in-use-indicator It all worked fine un...
45 comments posted 13yrs
posted by stevesemple
45 comments posted 13yrs posted by stevesemple

Need help with Kill-A-Watt meter

I got the Kill-A-Watt P4400 meter today, and just need a little help with what the display values mean. (This is all AC...
2 comments posted 13yrs
posted by waybackNO746SPAM44
2 comments posted 13yrs posted by waybackNO746SPAM44

Dimming low power light bulbs

I know one can dim filament bulbs with triacs (or similar). I think I know that one used not to be able to dim fluoresc...
10 comments posted 13yrs
posted by freddywilliams
10 comments posted 13yrs posted by freddywilliams

Charge gel cell with car charger?

A friend has a battery powered Ryobi lawn trimmer ("weed whacker") which doesn't work. The 12vdc wall wart puts out onl...
3 comments posted 13yrs
posted by mcham
3 comments posted 13yrs posted by mcham

Off Spec Web Page

One Fortune 500 company had a leaky roof and when it rained the water soaked the 720 volt ballast and other wiring of a...
1 comments posted 13yrs
posted by Bret_E_Cahill
1 comments posted 13yrs posted by Bret_E_Cahill