General Electronics

Driving a Discrete Input Having a 50ohm Impedance

Any one know of a good reference design for a driver for an input to unit with a 50ohm impedance and that's looking for...

25 comments posted 20yrs

posted by emq_33

25 comments posted 20yrs posted by emq_33

UC3854 PFC problems

I am working on UC3854 PFC. Input is 80-250V, 50Hz, output is 385V dc. Everything is made like on 250W pfc preregulator...

4 comments posted 20yrs

posted by spirit810

4 comments posted 20yrs posted by spirit810

Strange resistor nomenclature

Hello, I've seen in a few schematics lately a resistor nomenclature that is new to me, such as "6K8" or "4K7". In such...

12 comments posted 20yrs

posted by jonREMOVETHISdanniken

12 comments posted 20yrs posted by jonREMOVETHISdanniken

How does this sensor work?

At my gym, there's a cardio machine, like a treadmill, also with handles to push and pull. Something like cross country...

2 comments posted 20yrs

posted by mark-t2

2 comments posted 20yrs posted by mark-t2

PLD Help wanted!

Hi All, I have recently seen a PCB that uses a GAL16V8 to control a 4x7 keyboard matrix. The company that made the PCB...

5 comments posted 20yrs

posted by slodge1313

5 comments posted 20yrs posted by slodge1313

Multimeter giving incorrect readings

I have a DMM which I got a while back for $20 or so, from Jameco. Lately, it has been giving me incorrect readings - wh...

13 comments posted 20yrs

posted by drgames

13 comments posted 20yrs posted by drgames

Flood sensor

With rising sea levels at some point my home will flood - my road, in anyone's living memory, has never flooded but the...

21 comments posted 20yrs

posted by diverse

21 comments posted 20yrs posted by diverse

PC oscilloscope recommendations?

I need to get a digital scope. Since I will want to use it in the field some, I'm thinking along the lines of a compute...

4 comments posted 20yrs

posted by scottk

4 comments posted 20yrs posted by scottk

How to measure contactlessly position of a spinning miniature cylindrical magnet?

Hello, We are seeking a solution to monitor contactlessly (up to 10-15mm or more if possible) the position of a small c...

24 comments posted 20yrs

posted by eric.meurville

24 comments posted 20yrs posted by eric.meurville

Capturing EM interference with a microphone

Hi, I was hoping somebody here might be able to help me with a question. First, some background. A couple of months ago...

10 comments posted 20yrs

posted by no

10 comments posted 20yrs posted by no

I'm starting an electric vehicle drag racing team in Atlanta

I have just started recruiting people to join a hobbyist racing team in Atlanta with the goal of building a full sized,...

3 comments posted 20yrs

posted by SBDRacing

3 comments posted 20yrs posted by SBDRacing

how to make objects invisible.

I don't know is this is valid question or not. Is it possible to make objects invisible in sun light. Anybody have comme...

21 comments posted 20yrs

posted by raghuyadav77

21 comments posted 20yrs posted by raghuyadav77

Sony in violation of the Computer Misuse Act!

http://news.bbc.co.uk/1/hi/technology/4400148.stm I don't expect anything will be done, usual "We're a huge company and...

13 comments posted 20yrs

posted by testing_h

13 comments posted 20yrs posted by testing_h

Graphic LCD display

Someone knows where to buy 320x240 LCD graphic display with integrated controller? DL

1 comments posted 20yrs

posted by dan.lavoie

1 comments posted 20yrs posted by dan.lavoie

Wierd Ground Problem?

Last week we moved a video recording computer (PVR) from it's downstairs location (where it was working fine) to an ups...

11 comments posted 20yrs

posted by cindyanello

11 comments posted 20yrs posted by cindyanello