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Arduino Synth keyboard and parts

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prbrianpr

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Im currently making an Arduino Synth keyboard for my microcontroller class. Im stuck on the equalizer part and effects. I dont want something very expensive so im trying to put the effects on my arduino mega. Still I have the pieces to do the equalizer in the output of the arduino doing the following chart:

Buttons (Keyboard) ----> Arduino Mega (Waveform Generator)--------> Preamp (Gain, Tube effect, Volume)----> Equalizer------> Amplified Speakers

I Wanted to make an passive EQ but failed in all my experiments so I was looking in the internet and found this active EQ diagram that is inexpensive and looks nice. So I bought the IC by Ebay. I Have diferents Caps and Resistors but not exactly the same as the diagram. How I can do a conversion there?

Caps that I have:

1 x MK754U40 0.75 uf 400V 50/60 Hz
1 x 1000 uf 25V electrolitic
8 x 0.047 mkΦ (I think that is 0.047 uf) Mother Russia caps Paper In Oil K42Y-2
1 x 1000 uf 35 v electrolitic
2 x Sprague .47 uf Orange Drop 200DC
1 x 1000pf 300VAC
2 x 47 uf 35 v electrolitic
1 x 470 uf 25v electrolitic
1 x 47 uf 10V electrolitic
1 x 47 uf 16V electrolitic

Pots that I have:

2 x B10K
1 x 5K
1 x B1K
1 x B500K
10 x A250k


Resistors that I have

Like 20 resistors of 220 ohms
7 x 20kohms
10 x 10kohms
5 x 1kohms
8 x 5 Mohms
8 x 57 kohms

Any help will be appreciated
 

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Sorry this is my other FB account.

I Only have what I have I cant buy new caps and things because I have a limited budget. Still I can get that values or similar putting the caps in parallel- series and resistors? Still what stand for 393 124 392.. etc... in the diagram? that is uf? pf? mf?

BTW vvc will be 9V instead of 12V because all the other things uses 9V

I have to change the circuit sightly to meet what I have here. I want to now if it is possible modifing the wiring and circuit and using my parts (caps, resistors, etc...)
 
Sorry this is my other FB account.

I Only have what I have I cant buy new caps and things because I have a limited budget. Still I can get that values or similar putting the caps in parallel- series and resistors? Still what stand for 393 124 392.. etc... in the diagram? that is uf? pf? mf?

They are in pF, with the last digit the number of zeros - so 393 is 39,000pF (or 39nF, or 0.039uF).

You don't have a very good range of values, in fact only two - 0.047uF and 0.47uF - so there's really nothing you can so without buying some more.
 
I agree with Nige, the only thing I'd be looking at is designing round the 250k pots as yuo have a lot of them and they are expensive.
 
I can bypass a 250k pot with a resistor to get roughtly 100k I think.

thanks! ok this is the list:

393= 39nF or 0.039 uF
124= 120nF or 0.12 uF
392= 3.9nF or .0039 uF
123= 12nF or 0.012 uF
390= .39 nF
683= 68nF
223= 22nF
682= 6.8nF
but 1000 is ????
 
I Think that getting this kit and mixing with what I have I can do the job

I tried to buy everyone individual with high quality and gets very expensive. I tried to get everyone individual and still gets expensive. I tried my best but the synth will cost me a lot buying all this things apart. BTW they are electrolytic caps.
 

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BTW they are electrolytic caps.

None of the capacitors you asked about appear to be electrolytic, although as I said it uses non-standard (and confusing) symbols - but I presume that the electrolytic ones are marked with a plus (and the ones you asked about are too small to be electrolytic).
 
it comes in a package and sold as: 15 Value 200Pcs Electrolytic Capacitor Assortment Kit Arduino DIY Box 0.1-220uF

But anyway after looking at some synth pics I saw that they use non-polarized like radial film so I was looking and saw a package of radial film caps with this values

Value Voltage Tolerance
0.0012uF 100V 10%
0.0015uF 100V 5%
0.0018uF 630V 10%
0.002uF 63V 5%
0.0022uF 100V 10%
0.0039uF 100V 10%
0.0047uF 100V 5%
0.0056uF 100V 5%
0.0068uF 100V 10%
0.0082uF 100V 5%
0.01uF 50V 10%
0.015uF 100V 5%
0.018uF 100V 10%
0.022uF 50V 5%
0.033uF 50V 10%
0.039uF 100V 10%
0.047uF 250V 10%
0.056uF 100V 10%
0.068uF 50V 10%
0.1uF 100V 5%
0.15uF 63V 5%
0.18uF 100V 10%
0.22uF 250V 10%
0.33uF 50V 10%
0.39uF 50V 10%
0.43uF 100V 5%
0.56uF 250V 10%
0.68uF 100V 10%

is somewhat expensive to me at $32.00 but I think It does the job.

Update I found and but this other kit for $15.00 bucks

REF
#
Qty µF DC Voltage Markings / Notes
1
20 1000pF 100 102, Kyocera / AVX, Ceramic, Axial, Tape
2
5 0.01 630 10n, MKC, PCB Leads, Blue
3
5 0.015 275
VAC
Jimson, UL & CSA Rated, Yellow
4
20 0.047 50 473, Kyocera / AVX, Ceramic, Axial, Tape
5
5 0.056 100 563, Ether Components
6
10 0.1 100 PCB Leads, White
7
15 0.1 250 Mylar, Red
8
20 0.15 50 2A154K, Dipped Mylar, Green
9
5 0.33 50 334, Plastic Film, Panasonic, Tape, Brown
10
10 0.39 50 394, Plastic Film, Panasonic, Tape, Brown
11
10 1 50 Electrolytic, Tape, Blue
12
5 4.7 100 Electrolytic, Tape, Black
13
10 10 16 Electrolytic, Tape, Black
14
5 10 25 Electrolytic, Tape, Black, Axial
15
5 10 200 Electrolytic, Tape, Blue, 105ºC

I think I can do the job mixing in parallel the plastic film and mylar caps, also ceramic if needed.
 
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