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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Cricket Synth
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squarewhite



Joined: Jun 06, 2007
Posts: 62
Location: Asia

PostPosted: Thu Jan 26, 2012 3:17 am    Post subject: Cricket Synth Reply with quote  Mark this post and the followings unread

Hi,

i'm trying to build a cricket synth for a friend. i'm using this schematics.

Strange it doesn't seem to work when i patch the output after the BC547 emitter leg/470 trimmer/diode/22R. but when i connect my piezo to BC547 Base(2) i get the cricket sound. Also when i patch it at R8 and D3 i get a sound. can I simply do away with the emitter leg to R10 signal path?

any advice? is there any faults to this schmectics?


Cricket.GIF
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Cricket.GIF


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squarewhite



Joined: Jun 06, 2007
Posts: 62
Location: Asia

PostPosted: Thu Jan 26, 2012 3:22 am    Post subject: Reply with quote  Mark this post and the followings unread

one more thing. With the photoresistor place in this schmectics, the synth will only start when it's dark. how can i reverse this function. when it's dark it's goes quiet?
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JingleJoe



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PostPosted: Fri Jan 27, 2012 5:40 am    Post subject: Reply with quote  Mark this post and the followings unread

There is information missing here for anyone to be able to help you, what is that chip for a start?
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PHOBoS



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PostPosted: Fri Jan 27, 2012 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
There is information missing here for anyone to be able to help you, what is that chip for a start?

looks like a 4060 to me. (CLK divider with internal oscillator)

it could have to do with using a piezo instead of a small speaker (unless
that's what is specified). What kind of piezo are you using, just a bare disc
or one with a small oscillator circuit. Or maybe you just have a bad
transistor/solder joint, since the rest of the circuit seems to be functioning
because you can get sound.

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squarewhite



Joined: Jun 06, 2007
Posts: 62
Location: Asia

PostPosted: Fri Jan 27, 2012 1:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

opps sorry! yes it's the 4093 (left) and 4060 (right). the circuit is still in breadboard so it's strange that it doesn't work with the transistor. i guess i will do a test build if it works on the stripboard.

the position of the photoresistor is only play in darkness but when light is present, it doesn't. Is there anyway of reversing this function? what would the advice be?
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JingleJoe



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PostPosted: Fri Jan 27, 2012 4:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

As far as I can tell the light dependant resistor is acting as a voltage divider, simply swap the position of the regular resistor below it and the LDR to invert the behaviour of the circuit.
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