Team Cactus 7kw - Page 3

Perry Babin · 3rd January 2011, 06:22 AM

Follow the circuit back from the bases of the D1302s. It will likely go back through a resistor or two and possibly to an A1381 (transistor).

If that's true, follow the circuit back from the base of the A1381. What drives that transistor?

Perry Babin · 3rd January 2011, 06:23 AM

You stated that the square wave on the outputs is switching on and off. Does the current draw decrease when it's off?

mike49504 · 3rd January 2011, 06:32 AM

NO

mike49504 · 3rd January 2011, 06:39 AM

The base of the A1381 appears to be driven by the A1266 i removed

mike49504 · 3rd January 2011, 06:58 AM

OPPPSSS followed the wrong leg back .

The A1381 is driven by a C1027 Transistor heres the voltages on it

Leg1:0.00
Leg2:7.25
Leg3:0.00

Perry Babin · 3rd January 2011, 06:58 AM

Have you noticed any of the FETs (audio or power supply) heating up?

mike49504 · 3rd January 2011, 07:07 AM

No they all remain cool But i do have a limiter in line im afraid not to use it

Perry Babin · 3rd January 2011, 07:13 AM

Is the voltage on the collector of the C1027 constant?

mike49504 · 3rd January 2011, 07:14 AM

yes

Perry Babin · 3rd January 2011, 07:22 AM

Remove the C1027. Does the square wave remain constant?

If so, is it leaky?

3rd January 2011, 06:22 AM	#21
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Follow the circuit back from the bases of the D1302s. It will likely go back through a resistor or two and possibly to an A1381 (transistor). If that's true, follow the circuit back from the base of the A1381. What drives that transistor? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd January 2011, 06:23 AM	#22
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You stated that the square wave on the outputs is switching on and off. Does the current draw decrease when it's off? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd January 2011, 06:58 AM	#26
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Have you noticed any of the FETs (audio or power supply) heating up? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd January 2011, 07:13 AM	#28
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the voltage on the collector of the C1027 constant? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd January 2011, 07:22 AM	#30
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Remove the C1027. Does the square wave remain constant? If so, is it leaky? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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3rd January 2011, 06:32 AM	#23
mike49504 diyAudio Member Join Date: Sep 2006	NO

3rd January 2011, 06:39 AM	#24
mike49504 diyAudio Member Join Date: Sep 2006	The base of the A1381 appears to be driven by the A1266 i removed

3rd January 2011, 07:07 AM	#27
mike49504 diyAudio Member Join Date: Sep 2006	No they all remain cool But i do have a limiter in line im afraid not to use it

3rd January 2011, 07:14 AM	#29
mike49504 diyAudio Member Join Date: Sep 2006	yes

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