Hobby Electronics Basics

A different kind of motion sensing security light?

Correct me if I'm wrong on any of this, but... The motion sensor (part) output constantly varies. Only when its output...

49 comments posted 13yrs

posted by jdoe

49 comments posted 13yrs posted by jdoe

Where Is the Laser Sinking the Heat?

If anything goes wrong with a non air breathing high energy density battery or any high energy density energy storage m...

5 comments posted 13yrs

posted by BretCahill

5 comments posted 13yrs posted by BretCahill

Distribution Transformer

Distribution transformer aims to provide well tailored-solutions of all kind of voltage dilemma. We walk by holding the...

6 comments posted 13yrs

posted by servokons

6 comments posted 13yrs posted by servokons

Q: Any Problems with chargers with too high or low a capacity

I'm very happy that more and more wall chargers are the 5 VDC micro or mini types but many people just grab the nearest...

2 comments posted 13yrs

posted by Mycroft_B

2 comments posted 13yrs posted by Mycroft_B

S/N Ratio dependent on impedance match?

Why is S/N ratio dependent on impedance match? It would seem a ferrite loopstick antenna would deliver twice the voltag...

11 comments posted 13yrs

posted by bperryb

11 comments posted 13yrs posted by bperryb

Zigbee? RF control questions

Greetings All, I have two 4 axis CNC mills that I would like to add a 5th axis to. The machines are different makes wit...

0 comments posted 13yrs

posted by etpm

0 comments posted 13yrs posted by etpm

4538 monostable input rise/fall restriction

Does the 4538 monostable have any restriction on the rise/fall time of the triggering pulse? None of the datasheets I h...

9 comments posted 13yrs

posted by Pimpom

9 comments posted 13yrs posted by Pimpom

Have 5v regulator need 9 volts

Hi all, Tomorrow I'm working on a power supply to replace a 9v battery. All I have is a *5 volt regulator. I think can...

29 comments posted 13yrs

posted by amdx

29 comments posted 13yrs posted by amdx

Simplex 2400 Not Off Topic

Hello all, My first question: Are there any good ole' Simplex Tech's floating around it here anywhere?? I have a few que...

13 comments posted 13yrs

posted by royboynospam

13 comments posted 13yrs posted by royboynospam

Why the long leads?

Resistors, capacitors, LEDs, etc, when made for soldering into through hole curcuit boards, have really long leads. Why...

17 comments posted 13yrs

posted by etpm

17 comments posted 13yrs posted by etpm

Energy Density of Rechargeable Sodium Air Battery Is Close To Liquid Fuel

A gas tank equivalent battery starts out weighing 50 kg but after 350 miles it weighs 150 kg. Bret Cahill

0 comments posted 13yrs

posted by Bret_E_Cahill

0 comments posted 13yrs posted by Bret_E_Cahill

Timing circuit help needed

Installed car seat warmers into SWMBO's car. Key must be on for them to fu nction. Would like to rewire in a way that I...

3 comments posted 13yrs

posted by ivanvegvary

3 comments posted 13yrs posted by ivanvegvary

Viewing circuits in mono-spaced-font

Circuits are posted here (much appreciated) suggesting the use of mono-spaced-font for viewing. I've tried cut/paste in...

12 comments posted 13yrs

posted by ivanvegvary

12 comments posted 13yrs posted by ivanvegvary

Load Leveling With Sea Sequestration

Carbon abatement schemes always seem too much like closing -- or rather not closing -- the barn door while forgetting a...

4 comments posted 13yrs

posted by Bret_E_Cahill

4 comments posted 13yrs posted by Bret_E_Cahill

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