Hobby Electronics Basics

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LED lights when circuit broken

Hi, What is the simplest (cheapest, lowest energy) way to get an LED to light if the circuit from a 1.5v battery is brok...
14 comments posted 13yrs
posted by remcg
14 comments posted 13yrs posted by remcg

How Do They Get So Much Money for Grid Ties?

Are there still some unexpired patents out there? Does a grid tie require a 200 lb copper coil? Bret Cahill
2 comments posted 13yrs
posted by Bret_E_Cahill
2 comments posted 13yrs posted by Bret_E_Cahill

Battery parallel connection ?

Parallel connection on lantern batterys will have higher current, but it wi ll cause self dicharge to other battery wit...
2 comments posted 13yrs
posted by mowhoong
2 comments posted 13yrs posted by mowhoong

RS232 cable followup

Thanks again to those who responded to my RS232 cable question. This morning I soldered on the DB connectors and did a...
4 comments posted 13yrs
posted by etpm
4 comments posted 13yrs posted by etpm

QBasic syntax error?

Why does QBasic give me a syntax error with this code? ----------------------------------------------------------------...
41 comments posted 13yrs
posted by bperryb
41 comments posted 13yrs posted by bperryb

An RS232 cable question or two

Greetings RS232 Gurus, I have a couple machine tools that connect to a computer through RS232. I now need to run a long...
15 comments posted 13yrs
posted by etpm
15 comments posted 13yrs posted by etpm

Can someone retrieve this IEEE paper for me?

Can someone retrieve this IEEE paper for me? Fiori, F.; Crovetti, P.S, "A new compact temperature-compensated CMOS curr...
14 comments posted 13yrs
posted by To-Email-Use-The-Envelope-Icon
14 comments posted 13yrs posted by To-Email-Use-The-Envelope-Icon

Can solar panels be safely short-circuited?

Can solar panels be safely short-circuited while they are fully illuminated? I've looked at the specs and I understand...
13 comments posted 13yrs
posted by Pimpom
13 comments posted 13yrs posted by Pimpom

Mag-Lite Batteries Fail?

I just opened my Mag-lite flash light and found probably acid that had spilled out of one or both batteries. The light...
9 comments posted 13yrs
posted by wolftracks
9 comments posted 13yrs posted by wolftracks

Running at half the voltage

Have a 10Watt, 12Volt Hologen lamp for a christmas decoration. But the mains tranformer I have is only 6 Volts. Apart f...
47 comments posted 13yrs
posted by 459fgp86549
47 comments posted 13yrs posted by 459fgp86549

Passive f to 2f converter

I got a request for a f to 2f converter for our lockin. http://www.teachspin.com/instruments/signal_processor/ (Freq =...
14 comments posted 13yrs
posted by gherold
14 comments posted 13yrs posted by gherold

CD4017 chip output latching problem

HI all, I've been having problems with a timer circuit I'm building. It uses a chai n of seven CD4017BE decade counters...
9 comments posted 13yrs
posted by orion.osiris
9 comments posted 13yrs posted by orion.osiris

LCD tv imput help

My 32" Polaroid LCD (Model 3200) tv has lost most its video imputs. It only works on a cable coaxial imput. No screen p...
1 comments posted 13yrs
posted by footboarder
1 comments posted 13yrs posted by footboarder

Anybody want to bid a circuit design?

I'm working on a project for myself. I need a circuit that will output several 5 volt pulses on one output then stop th...
49 comments posted 13yrs
posted by etpm
49 comments posted 13yrs posted by etpm