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The Completed Projects Collection A collection of completed projects from All About Circuits forum members. Comment, ask questions, and add to their ideas.

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  #1  
Old 04-24-2010, 10:06 PM
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Default Project: "Cygnus" 2-way speakers

List of components:
C1/3 Capacitor Visaton ELKO spez. 2,2F;
C2 Capacitor Visaton ELKO spez. 10F;
FTE1 Woofer Visaton SC 13 8 OHM;
FTE2 Tweeter Visaton SC 10 N 8 OHM;
L1 Coil Visaton SP 0,68mH 1mm;
L2 Coil Visaton SP 0,68mH 0,6mm;
R1 8,2Ω wirewound resistor (5% tol., 5W).
R2 2,2Ω wirewound resistor (5% tol., 7W).
R3 18Ω wirewound resistor (5% tol., 5W).

Electrical parameters:
- Pnom = 50W
- Ppk = 80W
- R = 6,4Ohm
- Znom = 8Ohm

Audio characteristics:
- Frequency response (-10dB): 40-20000Hz
- Sensitivity (1W/1m): 87dB

Recommended enclosure specifications:
- Type: Ported (3th order quasi-Butterworth alignment)
- Volume: 9.756L
- Recommended duct: Monacor BR-30HP (length: 64mm)
- Resonant frequency (Fb): 50.64Hz
- -3dB frequency (F3): 52.30hz
Attached Files
File Type: pdf schematic_diagram.pdf (15.6 KB, 156 views)
File Type: pdf pcb.pdf (12.8 KB, 83 views)
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Last edited by bertus; 10-05-2010 at 09:18 PM. Reason: PCB diagram uploaded , changed title.
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  #2  
Old 04-27-2010, 06:05 PM
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Hello,

Are you also going to make a description of the housing for the speakers?
That would make it a complete project with your filter set you made now.

Greetings,
Bertus
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  #3  
Old 04-27-2010, 06:46 PM
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I wouldn't use passive cross over ever.
active cross over is the way to true audio.

By the way, ever thought about using wire wound resistors introducing extra inductance in to the crossover, you should go for cement ones.
Or am I wrong here?
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Old 04-27-2010, 09:33 PM
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Quote:
Originally Posted by bertus View Post
Hello,

Are you also going to make a description of the housing for the speakers?
That would make it a complete project with your filter set you made now.

Greetings,
Bertus
Thanks! The box is already planned and I'll post it any time soon.

Quote:
Originally Posted by R!f@@ View Post
I wouldn't use passive cross over ever.
active cross over is the way to true audio.

By the way, ever thought about using wire wound resistors introducing extra inductance in to the crossover, you should go for cement ones.
Or am I wrong here?
Indeed! Active crossovers are much more linear, but they require separate output stages for the high and low frequencies. You can have two approaches: an amplifier having those stages or an active speaker.

About the resistors, the ones I'm using have a cement filler. And the inductance is very, very small.
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  #5  
Old 04-28-2010, 03:25 PM
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Quote:
Indeed! Active crossovers are much more linear, but they require separate output stages for the high and low frequencies. You can have two approaches: an amplifier having those stages or an active speaker.
Indeed

Quote:
About the resistors, the ones I'm using have a cement filler. And the inductance is very, very small.
I guess then It's OK
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  #6  
Old 05-18-2010, 04:51 PM
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Quote:
Originally Posted by cumesoftware View Post
List of components:
C1/3 Capacitor Visaton ELKO spez. 2,2F;
C2 Capacitor Visaton ELKO spez. 10F;
FTE1 Woofer Visaton SC 13 8 OHM;
FTE2 Tweeter Visaton SC 10 N 8 OHM;
L1 Coil Visaton SP 0,68mH 1mm;
L2 Coil Visaton SP 0,68mH 0,6mm;
R1 8,2Ω wirewound resistor (5% tol., 5W).
R2 2,2Ω wirewound resistor (5% tol., 7W).
R3 18Ω wirewound resistor (5% tol., 5W).

Electrical parameters:
- Pnom = 50W
- Ppk = 80W
- R = 6,4Ohm
- Znom = 8Ohm

Audio characteristics:
- Frequency response (-10dB): 40-20000Hz
- Sensitivity (1W/1m): 87dB

Recommended enclosure specifications:
- Type: Ported (4th order quasi-Butterworth alignment)
- Volume: 9.756L
- Recommended duct: Monacor BR-30HP (length: 64mm)
- Resonant frequency (Fb): 50.644Hz
- -3dB frequency (F3): 52.30hz

hello there ,
can i use this circuit with the bass trrible and midi controller??
i jst have made the passive low pass bass trreble and midi circuit with adjustable gain of +-18db an i use tda7052 to amplify the power with 8 ohms speaker
can i use this circuit with that one???
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  #7  
Old 05-22-2010, 08:59 PM
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Originally Posted by abdus View Post
hello there ,
can i use this circuit with the bass trrible and midi controller??
i jst have made the passive low pass bass trreble and midi circuit with adjustable gain of +-18db an i use tda7052 to amplify the power with 8 ohms speaker
can i use this circuit with that one???
If I understood your question, I think you will have no problem using those speakers with your amplifier. These are 8Ohm speakers.
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  #8  
Old 05-26-2010, 12:53 AM
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Quote:
Originally Posted by abdus View Post
I use tda7052 to amplify the power with 8 ohms speaker
If the supply is 6V then the output at clipping into 8 ohms is only 0.96W. A cheap clock radio has more power.

Your tone controls have a max boost of about 80 times the power so unboosted frequencies have a max power of only 0.012W.
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Old 05-26-2010, 09:44 AM
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Quote:
Originally Posted by Audioguru View Post
If the supply is 6V then the output at clipping into 8 ohms is only 0.96W. A cheap clock radio has more power.
Indeed! Those speakers will sustain up to 50W nominal power, which is far greater than the power of 1W that a TDA7052 can provide.

Quote:
Originally Posted by Audioguru View Post
Your tone controls have a max boost of about 80 times the power so unboosted frequencies have a max power of only 0.012W.
I'm afraid we are going off-topic here. I don't see any point or relation with the actual project being discussed here.
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  #10  
Old 10-05-2010, 09:10 PM
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Someone messed this up big time. This thread should be called "Project: "Cygnus" 2-way speakers". This is Cygnus, not Lynx.
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