Hobby Electronics Basics

Is there a better way to do this?

I've got some 4KW 240 volt lamp dimmers from China. What I want is a cheap electric range current regulator. (For safet...

13 comments posted 11yrs

posted by default

13 comments posted 11yrs posted by default

What is your opinion of this 9 volt 900maH li-ion battery?

http://www.ebay.com/itm/Etinesan-Big-capacity-900mAh-9v-li-ion-lithium-Rechargeable-9-Volt-Battery-/390967934161?pt=LH_...

6 comments posted 11yrs

posted by bperryb

6 comments posted 11yrs posted by bperryb

Battery choice: 9V vs 6 AAs

I'm fixing a kid's toy that was damaged by corrosion (stored with the batteries). The only damaged part was the battery...

34 comments posted 11yrs

posted by a24061

34 comments posted 11yrs posted by a24061

2N3904 maximum ratings Vceo Vcbo

Is it safe to operate a 2N3904 in a switching application with a supply voltage of 48 volts? The data sheet says Vceo i...

17 comments posted 11yrs

posted by bperryb

17 comments posted 11yrs posted by bperryb

Running an electric motor backwards is less efficient?

Thinking about cordless drills. Those flipping the switch to run the drill backwards instead of forwards reduce the effi...

8 comments posted 11yrs

posted by always.look

8 comments posted 11yrs posted by always.look

Fourier Transform and DFT - Discrete Fourier Transform

In engineering practice, analog signal that is transformed with Fourier Transform has to be periodic. If signal is not...

0 comments posted 11yrs

posted by pchung705

0 comments posted 11yrs posted by pchung705

OT Marion's art

I thought some of you might enjoy this. It's my sister-in-law's work and it's all fused glass except for the frame. http...

4 comments posted 11yrs

posted by jfields

4 comments posted 11yrs posted by jfields

LED Flashlights

Why is that LED flashlights irregularly shut off. I give mine a slight bang to turn the light on.

6 comments posted 11yrs

posted by wolftracks

6 comments posted 11yrs posted by wolftracks

ot

Obama has precisely didley squat to do with foreign or domestic policy.

4 comments posted 11yrs

posted by mark

4 comments posted 11yrs posted by mark

OT: Today

Today is Yom HaShoah (Holocaust Remembrance Day) http://tinyurl.com/l5wjh79 "We will remember those who were murdered,...

33 comments posted 11yrs

posted by To-Email-Use-The-Envelope-Icon

33 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

Voltage Compliant Parts Updated

CompliantParts.zip, on the Device Models & Subcircuits Page of my website, has been updated to include subcircuit repre...

2 comments posted 11yrs

posted by To-Email-Use-The-Envelope-Icon

2 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

Transistor-Transistor TTL Logic and Totem pole output

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL techno...

0 comments posted 11yrs

posted by pchung705

0 comments posted 11yrs posted by pchung705

VP95 PMOS?

Anyone have information on a VP95 PMOS FET? I can't even find a datasheet let alone a Spice model. ...Jim Thompson -- |...

0 comments posted 11yrs

posted by To-Email-Use-The-Envelope-Icon

0 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

n-channel enhanecement MOSFET - working: why is it an n-type inversion layer?

In this MOSFET, when we apply a +ve voltage to the Gate, we repel holes as the majority charge carrier in the p-type su...

4 comments posted 11yrs

posted by vek.m1234

4 comments posted 11yrs posted by vek.m1234

Periodic Table of Units for Electromagnetism

The Periodic Table is here in a .pdf file: https://drive.google.com/open?id=0Bye97v1hDDEzUzV1U1V1X0M3WHM&authuser=0 Memo...

1 comments posted 11yrs

posted by omnilobe

1 comments posted 11yrs posted by omnilobe