Hi all,
i'm quite new to elektronics and after building a small mp3 speaker i am now planning to build a stylophone . i think its a great project to learn PCB etching.
this is what i'm talking about:
http://www.otherlandtoys.co.uk/stylophone-p-2405.html
its a tone generator build as a musical intrument
this is where i got the idea from:
http://www.instructables.com/id/A-Stylophone/
but then i found this:
http://www.waitingforfriday.com/index.php/Reverse_Engineering_the_Stylophone
it's a reversed engineered circuit of one of the first stylophones of the late 60's with a UJT transistor instead of a 555 timer. where the newer versions with 555 chips create a square wave this device has an different (nicer) sound.
i build a prototype on breadboard with a potmeter to adjust the tone and it works great!
because the original circuit uses a 75 Ohm speaker, which is hard to find and expensive. I used a lm386 and a 8 Ohm speaker instead of the BC337 and 75 Ohm speaker just like the instructables project.
the part on which I need some advice is this:
how could I make a line out connection on my circuit?
should I use the amplified signal from the lm386 and lower the voltage to accomodate a line out connention?
or should I use the unamplified signal, which I think is to weak?
also I would like the speaker to be silent if the line out is in use.
I can't tell if this is already the case in the reversed engineered circuit.
here is the reversed engineered circuit (without the lm386 of course):
EDIT: don't know why it does'nt work but you can right click and open in a new tab
i'm quite new to elektronics and after building a small mp3 speaker i am now planning to build a stylophone . i think its a great project to learn PCB etching.
this is what i'm talking about:
http://www.otherlandtoys.co.uk/stylophone-p-2405.html
its a tone generator build as a musical intrument
this is where i got the idea from:
http://www.instructables.com/id/A-Stylophone/
but then i found this:
http://www.waitingforfriday.com/index.php/Reverse_Engineering_the_Stylophone
it's a reversed engineered circuit of one of the first stylophones of the late 60's with a UJT transistor instead of a 555 timer. where the newer versions with 555 chips create a square wave this device has an different (nicer) sound.
i build a prototype on breadboard with a potmeter to adjust the tone and it works great!
because the original circuit uses a 75 Ohm speaker, which is hard to find and expensive. I used a lm386 and a 8 Ohm speaker instead of the BC337 and 75 Ohm speaker just like the instructables project.
the part on which I need some advice is this:
how could I make a line out connection on my circuit?
should I use the amplified signal from the lm386 and lower the voltage to accomodate a line out connention?
or should I use the unamplified signal, which I think is to weak?
also I would like the speaker to be silent if the line out is in use.
I can't tell if this is already the case in the reversed engineered circuit.
here is the reversed engineered circuit (without the lm386 of course):
EDIT: don't know why it does'nt work but you can right click and open in a new tab
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