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What do you think of this circuit?

I made a few changes to a circuit, since it's the first time I do this I'd like to know what you think and if there's anything I should change.

Picture of What do you think of this circuit?
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This is tested and works.
I modified your circuit so it would be controlled by Arduino.
First you connect the outputs of the Arduino to the 4 resistors feeding the transistors, then when you trigger 1 or more transistors to get these frequencies.

1 = 4800
1 + 5 + 9 = 4180
1 + 5 + 7 + 9 = 4110
1 + 5 = 3600
1 + 7 = 2880
5 + 7 + 9 = 2750
1 + 9 = 2400
5 + 7 = 2050
5 + 9 = 1800
7 + 9 = 1600
5 = 1300
7 = 960
9 = 755

The other combinations reproduce the same results.
You can increase or reduce the frequencies by changing the 0.1 capacitor up or down in value.
Is this what you wanted to do?
music.bmp
pquadros (author)  Josehf Murchison3 years ago
That's great and yes it's what I wanted to do.
I'll try it, thanks!
Can you read the schematic?
pquadros (author)  Josehf Murchison3 years ago
Yes. I haven't worked with transistors yet but I have a few laying around, and I can understand the circuit.
These are good sights to get datasheets on components.

http://www.maxim4u.com/

http://www.alldatasheet.com/

just enter the part number in the search box.
what do you want it to do.
pquadros (author)  Josehf Murchison3 years ago
I want to make an oscillator.
I got that you want the oscillator to ????????????

You have three buttons and 8 possible oscillations.

What do you want the oscillations to do?

By the way where are you?

You should put your location in your profile.

It helps in that I have breadboards and over 100,000 components, I can test and tweak a circuit, then send the results to you (not everything someone might come up with) and you can order the parts on line and build it yourself.

After all we are here because we like to help.
pquadros (author)  Josehf Murchison3 years ago
I want to connect an audio jack in the output and make an audio oscillator (sort of like the Atari Punk Console, just simpler).

I'm in a small city in Brazil, it isn't very easy to get components here, so please test it if you can.

Thank you.
caitlinsdad3 years ago
What happens on the breadboard?
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