## Search found 12 matches

Fri Dec 28, 2012 5:42 pm
Forum: Introduction to Modern Electronics
Topic: #10 Schematics & Documentation [Post Homework Here]
Replies: 5
Views: 16785

### Re: #10 Schematics & Documentation [Post Homework Here]

Cool, thanks for the lessons so far. Can't wait for March!
Fri Dec 28, 2012 1:29 am
Forum: Introduction to Modern Electronics
Topic: #10 Schematics & Documentation [Post Homework Here]
Replies: 5
Views: 16785

### Re: #10 Schematics & Documentation [Post Homework Here]

What is the difference between a datasheet and a schematic? Datasheet - gives information about a specific part Schematic - conveys the design of an entire circuit What is the circuit symbol for a power supply? http://www.clker.com/cliparts/5/8/5/5/11970907491735964845vermeil_IEC_Cell_Symbol.svg.med...
Mon Dec 24, 2012 12:18 pm
Forum: Introduction to Modern Electronics
Topic: #9 The 555 Timer [Post Homework Here]
Replies: 6
Views: 19510

### Re: #9 The 555 Timer [Post Homework Here]

Haha, you got me!

Well technically I solved it right though, since I calculated Toff as 0!

That was a good learning experience nonetheless
Fri Dec 21, 2012 3:29 am
Forum: Introduction to Modern Electronics
Topic: #9 The 555 Timer [Post Homework Here]
Replies: 6
Views: 19510

### Re: #9 The 555 Timer [Post Homework Here]

1. What are two uses of the 555 timer? Metronome, stable timer for time critical circuit 2. How many pins does a standard LM555 timer IC have and what are the names of each pin? 8 pins in total: (details given for astable mode, which was what was shown in the tutorial) 1) Ground - Most negative pote...
Wed Dec 19, 2012 3:45 am
Forum: Put'm Here
Topic: Questions: transformers / voltage sources in parallel
Replies: 1
Views: 14045

### Questions: transformers / voltage sources in parallel

Hi there, got a couple of questions for those feeling particularly helpful today: 1. Question 23 from http://www.allaboutcircuits.com/worksheets/trans1.html : Suppose you need to power a 120 volt, 600 watt heating element from a 240 volt source. You happen to have several 240V/120V step-down transfo...
Sun Dec 16, 2012 2:00 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

Thanks again for the help!
http://i.imgur.com/9unld.png same circuit with frequency at 1kHz, that was awesome!
Sun Dec 16, 2012 1:44 am
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

This is what I got using AC.. seems to be -5x voltage alright:

http://i.imgur.com/wfkBf.png
Sat Dec 15, 2012 9:13 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

Wait.. so it only works with AC source?
Sat Dec 15, 2012 8:28 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

That worked for the comparator, thanks.

Will post screenshot of amplification if I ever get it working...
Sat Dec 15, 2012 6:32 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

I experimented with what you said about Vin and Vref for the comparator, and for some reason I'm getting the completely opposite result: http://i.imgur.com/PpodZ.png Could this be a bug, or am I doing something wrong? Switching Vin to the (+) terminal and Vref to the (-) terminal also gives the comp...
Sat Dec 15, 2012 5:37 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

I tried your adjustments and I'm still not getting 5x amplification: http://i.imgur.com/J6cWO.png This is in Multisim by the way. I'll keep fiddling with it for a bit. Thanks for your help, the site is great by the way, I was unclear on a lot of basic concepts because a lot of tutorials tend to thro...
Sat Dec 15, 2012 3:42 pm
Forum: Introduction to Modern Electronics
Topic: #8 The OpAmp [Post Homework Here]
Replies: 13
Views: 26727

### Re: #8 The OpAmp [Post Homework Here]

What are two uses for Op-Amps? A: Comparator circuits and amplifier circuits. What are the two main types of amplifier configurations used with Op-Amps? A: Inverting Vo = (-R2/R1)Vi Non-inverting Vo = (1 + R2/R1)Vi How can an Op-Amp be used as a comparator? A: Connect unknown voltage to Vin (pin 3 ...

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