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Sallen Key Low Pass Filter, bandpass filter

bertus

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hello,

good to hear that the second row is working.
now you have a possibility to compare the two circuits.

bertus
 

Maglatron

Jul 12, 2023
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perhaps should have done that first to be fair but I just ripped it all out of the first one, ready to copy the second thanks for the suggestion though, could it be related to the bypass caps being to far from the power lines on the chips because I did get the caps ALOT closer second time round but I honestly think I just over looked something no worries though back on track!! by ripped out I meant desoldered!
 
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Maglatron

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There's 'bugger all' to the basic design of the filter section that couldn't be actually, physically constructed (on protoboard or hardwired) with sockets for the relevant resistor/capacitor values and you could play to your hearts content until you found something that worked.

How about building ONE channel that actually works?

It would be a damned sight quicker than a 700+ post regime and save some members time too.

It would also be nice for those who have taken the time and effort to assist in this thread to see something PRACTICAL from all their input. A few displays on some board doesn't cut it.

And if you haven't got a grasp of it by now then you need to reconsider your approach.
I now have a working channel!!! Mr kellys_eye :)
 

Maglatron

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I will keep you updated on this project, each time I have done 5 full channel/columns I'll post pics and I'll let you know when if I fix column 1!! thanks
 

Maglatron

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A Maglatron is what I've named the electro-mechanical machine that I'm designing/making/inventing! I'm on the maglatron 2.0 as 1.0 fell to bits! and to be fair, I'm not explaining was it does or how it works because you wouldn't understatand it and if you did you'd nick the idea! this is the maglatron 1.0 it had a screen to monitor RPM too, it broke down and I'm starting the 2.0 when I've finished the light board!! because as it was said before I dont want all the help annd comments made in this thread to have been a waste of members time and so getting practical results for the guys! the light board that react to sound is a secondary project, my passion is the Maglatron
 

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Delta Prime

Jul 29, 2020
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because as it was said before I dont want all the help annd comments made in this thread to have been a waste of members time
It's a horrible thing to say.
For everyone else,I'm responsible for that statement.
I have used that in other posts as well, as if I was mailing a form letter to the masses.
It was narcissistic and rude.
I formerly apologize to you.
We're not put on this Earth to see through one another but to see one another through,..
 

Maglatron

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Don't worry dood, I don't think it was narcissistic or rude! I think it was a fair thing to say, after all the thread is almost 900 post's long and I have had alot of help and I do not want to have wasted members' time! So I'm trying to get the results for the guys, thanks, should be having a session on it today! Also some thing interesting, when I tap the batteries into the power lines in two different spots - even though they are connected physically, one pair of lines, the bar leds on the working circuit; - work - but on the other pair of lines, no joy why would this happen? thanks
 
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bertus

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hello,

it does not matter how long yhe thread gets.
the main purpose is that you are learning.
we are here to support you in all the ways we can.

bertus
 

Maglatron

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ok, and I am learning, albeit slowly but I'm just going to take this opportunity to say how greatfull I am for all of your inputs and thank you :)
 

Maglatron

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so about the power lines, as I said, when I hook in the power to one set of lines that are connected to the second set of lines (physically) it doesn't act as it should any ideas of why? makes no sense to me!!
 

Maglatron

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not sure where to put this post so if the people in charge want to move it, thats fine I want to know where to buy the technic gear boxes in this short video! any one know what they're called or where to find?
 

Maglatron

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so I had a session today on the second set of LM3914's nearly completed the top side, they're looking good!! then have to put power lines to it and then solder in all 20 LED's only had 45mins
 

Delta Prime

Jul 29, 2020
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I want to know where to buy the technic gear boxes in this short video! any one know what they're called or where to find?
Looks like a simple forward reverse gearbox. I'm not a mechanical engineer ... but I played one on TV. :)
photo_1712301949608.png
 

Maglatron

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so you never guess what! I hooked up another set of LM3914's and the signal wire from filter two makes both of the columns light so I've determined that the circuit I ripped out was probably good and it was a bad filter so I'm going to look over it but I just think that 45Hz is too low a frequency!!
 

Maglatron

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the numbers I am working with are (filter stage 1: 150k, 4.7k, 270k)(filter stage 2: 130k, 2k, 510k)(filter stage 3: 160k, 2.4k, 620k) not sure where I aquired those numbers but will try using the values in the pic below!! and see the out come! thanks well I do know where I aqired the values it was that filter wizard but I'll try the new values any way!
1712505459284.png
 
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Maglatron

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so dug out the new value resistors and probably have them fitted tomorrow for the first filter and see if it has better results! thanks
 
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