General Electronics

The term bandwidth as oppossed to frequency.

I understand the term 'Bandwidth' when used to refer to a range of frequencies, eg Fmin to Fmax. But I often hear the t...

5 comments posted 21yrs

posted by robininbkk

5 comments posted 21yrs posted by robininbkk

Ultrasonic

Hello, I am requesting help to construct an ultrasonic device that emits sound at about 25Khz. Unlike most ultrasonic d...

6 comments posted 21yrs

posted by no

6 comments posted 21yrs posted by no

Panasonic SC-PM27 stereo - Need schem and/or service manual

I've got a Panasonic SC-PM27 mini-stereo here that is haunted Confused Panasonic is of no help. I need a schematic and...

4 comments posted 21yrs

posted by joe

4 comments posted 21yrs posted by joe

The DEFINITIVE Miniature Lamp Catalog

It looks as if they have essentially lifted the pages out of the ol' GE Miniature Lamp Catalog and put them into this ....

5 comments posted 21yrs

posted by alondra101

5 comments posted 21yrs posted by alondra101

PC motor controller

You can build a cheap 8-bit 255 speed DC motor speed controller from the parallel port of a PC. PC Parallel Port Pinout...

1 comments posted 21yrs

posted by jon8338

1 comments posted 21yrs posted by jon8338

Digital comb filters - what do they do?

My new TV has a 3 line digital comb filter. I understand that it's supposed to improve the image, but what does it do te...

2 comments posted 21yrs

posted by sbt

2 comments posted 21yrs posted by sbt

Laptop keyboard - how does it work?

Underlying the key mechanisms is a double-sided film with concentric circuit pads (for each key) on either side of the...

6 comments posted 21yrs

posted by me

6 comments posted 21yrs posted by me

lead free ?

Hi all, what the issue with this "new law" which comes about next year about lead free semis ? If its law next year then...

5 comments posted 21yrs

posted by exxos

5 comments posted 21yrs posted by exxos

In-car chargers - will they damage my MP3 player?

Hi, Does anybody know if I use a 5V, 0.8A adaptor plugged into my car's cigarette lighter to charge my MP3 player (that...

3 comments posted 21yrs

posted by bobr05

3 comments posted 21yrs posted by bobr05

Schizo Hydro Power Plant Does Both 50Hz and 60Hz.

WOW! 750kV AC! -+500kV DC! The 2nd & 3ed pages give pics and info on the generators, etc. Each of the 18 generators put...

33 comments posted 21yrs

posted by NOSPAM

33 comments posted 21yrs posted by NOSPAM

Sound cancellation technology?

How far has sound cancellation technology come, for use in a room area? For example, for a bedroom? I need some sound c...

37 comments posted 21yrs

posted by VoiceFreedom

37 comments posted 21yrs posted by VoiceFreedom

NiMH battery charger; on a timer for "always charged" batteries?

I can't seem to find an NiMH charger that will keep a bunch (preferrably at least 8, if not 16) of NiMH cells topped of...

2 comments posted 21yrs

posted by usenet

2 comments posted 21yrs posted by usenet

Have you ever seen this symbol ?

http://members.aol.com/aanotes3/lec.jpg I think I saw it (or something like it) on a cirquit diagram in the 1950s. Any...

17 comments posted 21yrs

posted by AdogAnotes

17 comments posted 21yrs posted by AdogAnotes

S-Video Vs Component for Television/DVD setup

I'm getting a TV with both S-Video and Component inputs. My DVD player also has S-Video and Component outputs and I'm w...

8 comments posted 21yrs

posted by sbt

8 comments posted 21yrs posted by sbt

digi. cam.ext. battery

http://www.concord-camera.com Can't get any useful specs. from above website on their 3045 camera. I want to run it fro...

11 comments posted 21yrs

posted by hartlyuk

11 comments posted 21yrs posted by hartlyuk