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The idea comes from Reinhard Gupfinger a Linz based artist I met during the Ars Electronica Festival 2011 in Linz.
The idea comes from Reinhard Gupfinger a Linz based artist I met during the Ars Electronica Festival 2011 in Linz.
This circuit here is a altered version of his original circuit.<br>
This circuit here is a altered version of his original circuit.<br>
A video demonstrating the functionality can be found here: [http://www.youtube.com/watch?v=DyLsBAO6dLQ Youtube video]<br>
A video demonstrating the functionality can be found here: <youtube>http://www.youtube.com/watch?v=DyLsBAO6dLQ</youtube><br>
Since it is hard to recreate a circuit not having a pcb an a schematic, people who want to recreate the Urban cricket will find the schematics, a layout to create a pcb and a parts list here.
Since it is hard to recreate a circuit not having a pcb an a schematic, people who want to recreate the Urban cricket will find the schematics, a layout to create a pcb and a parts list here.
Well, there are different options how to assemble the circuit.
Well, there are different options how to assemble the circuit.
The "original" parts list was:
The "original" parts list was:
*R1: 100 k (kilo Ohms) (ie. brown-black-yellow-gold)
*'''R1: 100 k (kilo Ohms)'''
*R2: 39 k
*'''R2: 39 k'''
*R3: 290 k
*'''R3: 290 k'''
*C1: 100 nf (nano Farad)
*'''C1: 100 nf (nano Farad)'''
*C2: 10 µf (micro Farad)
*'''C2: 10 µf (micro Farad)'''
*C3: 10 µf
*'''C3: 10 µf'''
*C4: 100 µF
*C4: 100 µF
*Beeper (part number Conrad electronic: 710865)
*Beeper (part number Conrad electronic: 710865)
*IC: 74HC14 (6x inverter with Schmitt trigger) or 74HC04 (6x inverter) (part number Conrad electronic: 164232 or 164194)
*IC: 74HC14 (6x inverter with Schmitt trigger) or 74HC04 (6x inverter) (part number Conrad electronic: 164232 or 164194)
The bold faced parts can be changed to generate a different tone. Since the use of polarized capacitors for C2 and C3 is kind of unskilled (it works most the times especially when using higher voltage capacitors ie. 63 volts) it is better to use non-polarized capacitors. 10µF non-polarized ones are expensive and or bigger. So much smaller capacitors can be used when increasing the value of the corresponding resistor at the same time.
Other possible Values are:
*'''R1: 100 k (kilo Ohms)'''
*'''R2: 2.2 M (Mega Ohms)'''
*'''R3: 22 M'''
*'''C1: 100 nf (nano Farad)'''
*'''C2: 100 nf'''
*'''C3: 100 nf'''
Or:
*'''R1: 100 k (kilo Ohms)'''
*'''R2: 3.3 M (Mega Ohms)'''
*'''R3: 3.3 M'''
*'''C1: 100 nf (nano Farad)'''
*'''C2: 68 nf'''
*'''C3: 560 nf'''
The values should be matched among the 3 oscillators to prevent "chopping off" a tone (brrrr brrrr brrrr br or Brrrr Brrr B).
So the values above are only suggestions of what could sound nice. Try to experiment, maybe use a potentiometer to change the tone on the fly.
= Making a PCB =
= Making a PCB =
[[Image:Urban-cricket-laout-copper-bottom.gif|thumb|Bottom view PCB layout for 18pcs. (600dpi) on a 100x160mm one-sided PCB]]
[[Image:Urban-cricket-laout-copper-bottom.gif|thumb|Bottom view PCB layout for 18pcs. (600dpi) on a 100x160mm one-sided PCB]]
[[Image:Urban-cricket-18pcs-pcb.jpg|thumb|Completed 18pcs PCB]]
The Image on the right is a 600dpi layout of the PCBs. It is designated to make 18pcs. out of one Euro-PCB (one sided, 100x160mm)
= Assembly =
= Assembly =
* [http://www.soundtossing.com/ Sound tossing website]
* [http://www.soundtossing.com/ Sound tossing website]
* [https://www.facebook.com/soundtossing Sound tossing Facebook page]
* [https://www.facebook.com/soundtossing Sound tossing Facebook page]
* <youtube dimensions=\"480\">http://www.youtube.com/watch?v=-bwncfuJNp0 Introduction to Urban Cricket (German)</youtube>
* <youtube dimensions=\"480\">http://www.youtube.com/watch?v=-kvQyy8XEb4 Introduction to Urban Cricket (English)</youtube>
* <youtube dimensions=\"480\">http://www.youtube.com/watch?v=DyLsBAO6dLQ Sound sample</youtube>
= Credits =
Rudi, Christoph, Adrian, Christian