Leave these fields empty (spam trap):
Name
You can leave this blank to post anonymously, or you can create a Tripcode by using the format Name#Password
Comment
[i]Italic Text[/i]
[b]Bold Text[/b]
[spoiler]Spoiler Text[/spoiler]
>Highlight/Quote Text
[pre]Preformatted & Monospace Text[/pre]
[super]Superset Text[/super]
[sub]Subset Text[/sub]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists
File

Sandwich


Discord Now Fully Linked With 420chan IRC

Electrical Sharegineering

Reply
- Sat, 27 Feb 2016 03:24:15 EST EGgJzstS No.6919
File: 1456561455718.gif -(1149890B / 1.10MB, 500x500) Thumbnail displayed, click image for full size. Electrical Sharegineering
Hi,

I'm a millionaire drunk stoner with a pretty complete knowledge of everything concerning electrical engineering. Ask me anything!
>>
Alice Dozzlehedging - Sat, 27 Feb 2016 14:03:21 EST MqUytbou No.6920 Reply
>>6919
You are obviously a shill shilling your beliefs I have no interest in your shillery, your part of the corrupt system
>>
Jenny Clombleledge - Tue, 08 Mar 2016 14:59:47 EST BK1z9Hz4 No.6925 Reply
where did you get your money?
>>
Priscilla Chembleridge - Sun, 13 Mar 2016 06:13:00 EST EGgJzstS No.6930 Reply
1457863980420.jpg -(155126B / 151.49KB, 740x585) Thumbnail displayed, click image for full size.
>>6925
From hundreds of thousands of people.
>>
Sophie Trotham - Mon, 14 Mar 2016 23:13:31 EST lFnHyynO No.6931 Reply
>>6919
How can you claim near complete knowledge on any thing much less electrical engineering?
The arrogance of it all
>>
Lillian Wullermane - Sun, 20 Mar 2016 16:25:31 EST u8H9TxN8 No.6933 Reply
1458505531352.jpg -(270752B / 264.41KB, 1248x913) Thumbnail displayed, click image for full size.
>>6919
Can you please help med finance my trading carrer? I have done 3 years of electrician school, base course, automatics and high voltage installations. Now i am willing to trade fx and live of OPM vikingboast at gmail (other people's money) currently live in norway on planet earth, almost drunk regards stoner drunk self employed planning to build a geely reactor this weekend
>>
press !QUHukXEvkY - Tue, 22 Mar 2016 16:29:11 EST +VVTNOia No.6936 Reply
Whats it like to be a gigantic tool?
>>
Sophie Clayfuck - Wed, 23 Mar 2016 02:55:40 EST EGgJzstS No.6937 Reply
1458716140456.jpg -(70695B / 69.04KB, 637x472) Thumbnail displayed, click image for full size.
>>6931
Semantics are dumb, shitlock (that's a warlock that obtains his powers from shit, btw.) I'm great and I can do great things, and when there is a greater way to do things I will do great things with that greater way.
>>6933
Do you succ of dick?
>>6936
What's it like to be a nobody? (That usually intimidates the masses.)
>>
Hedda Clayford - Tue, 12 Apr 2016 23:40:41 EST s86KHZQj No.6942 Reply
How did you motivate yourself to keep doing your homework when your professors started rehashing freshman kinematics problems for no fucking reason?
>>
Hugh Poblinggold - Fri, 15 Apr 2016 01:46:52 EST uywTW9Q3 No.6943 Reply
Why is the response time of a photodiode faster than the response time of a photoresistor?
>>
Thomas Brirryfadge - Mon, 18 Apr 2016 04:23:25 EST l8g6dMpE No.6946 Reply
>>6945
Ah too bad, its pretty fun every now and again. They aired an episode last friday in which they talked about photo diodes and photo resistors briefly, I thought your question arose from that. Too bad they didn`t explain it there, I`m curious as well.
>>
Alice Buddlestat - Thu, 05 May 2016 16:25:00 EST Mammg+Yw No.6957 Reply
1462479900664.png -(19977B / 19.51KB, 714x493) Thumbnail displayed, click image for full size.
>>6919
I've got a chemistry degree but I really like EE stuff as a hobby. I make effect pedals and amps and shit, but I try to gear myself more towards doing something "new" than making a bunch of clones of pedals from various established manufacturers. I try to stick to analog-ish designs, not because I think analog has some kind of magical "sound", but it's just not as fun to throw an expensive digital chip at every problem you encounter.

Currently I'm trying to build a circuit that uses a CD4046 PLL to determine the fundamental frequency of the input, then subtracts it with a differential amplifier, leaving only the harmonics on the output. I'm trying to use a JFET-based VCA circuit to vary the level of the cancellation signal so that it exactly cancels out the fundamental frequency of the input, but I'm having trouble figuring out how to get the control voltage to work right. Too little cancellation just feeds the original signal through the output, and too much cancellation just recreates the original signal with the fundamental out of phase, so I need to figure out some way to detect when the output is at its minimum signal level and keep it there with some kind of feedback loop. I tried rectifying the output to pulsed DC and feeding it through a differentiator; based on the assumption that the DC output level from the rectifier is approximately parabolic as the signal from the PLL is swept through "too little" and "too much," I'd assumed that the signal out of the differentiator would be approximately linear, with the approximately parabolic minimum from the previous stage corresponding to 0 VDC on the output.

But it's not working. Is this an incorrect approach or do I just need to keep fine tuning to get the right RC constants? Are there any semi-easily accessible analog computing books or sites that would help me with this kind of signal processing?
>>
Phyllis Blytheson - Mon, 09 May 2016 18:39:54 EST tT4bTGqP No.6958 Reply
>>6957
As a PC game programmer, reading MSDN documentation is pretty much my life now. At least it's leagues better documented and better organized than the stuff Apple puts out though.
>>
Charles Chorringkag - Mon, 23 May 2016 13:06:20 EST Mammg+Yw No.6960 Reply
1464023180507.png -(69902B / 68.26KB, 1638x864) Thumbnail displayed, click image for full size.
>>6959
If I used a simple filter it would only work for the note that the filter removes. I would have to make the filter frequency controllable by the input frequency, so it would be just as complicated as what I'm trying to do now.

The circuit I have so far actually simulates rather well. With input signals above 1kHz, I can get the oscillator level to match the input rather well from 10mV to 1V, with a response time around 1ms. The problem is that lower frequency signals cause the control voltage to oscillate, which really garbles the PLL signal and thus the output. The filter following the recitifers is well overdamped, so I'm thinking the problem has something to do with the non-linear response of the JFET VCA. I wanted to keep using JFETs for cost reasons, but I may switch to something optoelectronic, since the response is typically much smoother/slower.
>>
Ebenezer Pummletork - Wed, 25 May 2016 13:04:02 EST Mammg+Yw No.6962 Reply
>>6961
I don't think you understand what I'm trying to do. I want to remove only the fundamental frequency of a note from a guitar or other instrument and leave the harmonics untouched. It should be able to do this over the entire range of the instrument. If I use any fixed-frequency filters in the signal path, it will only work correctly for a certain range. For example, if I eliminate 500-1000 Hz with a filter, the effect will work for this range of input frequencies; but if I play a note at 250 Hz, it will filter out the first and second harmonic (500 and 1k Hz) and leave the fundamental untouched; if I feed in a note at 2000Hz it won't do fucking anything. If I make the bandwidth any larger than an octave, it won't work for ANY input frequency because the for it will start filtering out the harmonics of any note within the filter range. There is no way to get more than one octave of useful range with static filters because I specifically want to remove "one" frequency which can vary over several octaves. Something MUST track the input frequency; it cannot be done with fixed-frequency filters.

Don't be so condescending. I understand how filters work. You mixed up highpass / lowpass as well as bandpass / bandstop.
>>
Shit Bizzleforth - Tue, 07 Jun 2016 21:48:46 EST 7ztzoB70 No.6970 Reply
Calculus, asides from obvious shit like wolfram alpha and its rubbishy pay to get step by step shit can you recommend any good resources or books to learn from?
>>
Hedda Fazzledidge - Sat, 16 Mar 2019 14:43:56 EST prL5ucFo No.7224 Reply
>>6970
symbolab is a better calculator than wolfram alpha
Free textbooks are all over the net. I like elements of electromagnetism by sadiku which can be found online. Theres also intro to electrodynamics by griffiths, found online
>>
Charles Carrytone - Sun, 17 Mar 2019 10:37:13 EST CeE4ol82 No.7225 Reply
Explain the concept of phase difference. How is current flowing when voltage is zero?
>>
Frederick Pickwater - Thu, 11 Jul 2019 19:46:50 EST fbGCGW34 No.7227 Reply
>>7225
Standing waves, if I'd take a crack at it without googling. Voltage, a propensity for flow. Current, the flow. Take two tuning forks at the same frequency and they'll resonate. Now, a difference tone is the dissonance caused by the beating from two different frequencies. If there is a phase difference inherent in an electric circuit, that differential frequency can be excited by resonance with another unseen frequency that's boosting its signal via constructive interference. That's all I have and now I'll google... Idunno boss, you tell me.

Report Post
Reason
Note
Please be descriptive with report notes,
this helps staff resolve issues quicker.