H Hexhclass Member Joined 2010 2024-08-30 8:54 pm #1 2024-08-30 8:54 pm #1 There is no rail to rail oscillation on the outputs.I see a square wave on pin one of the 21844. 12v on the vcc pin is there. I replace the IC no change. Any suggestions? Attachments IMG_3443.jpeg 708.4 KB · Views: 46 IMG_3442.jpeg 580.2 KB · Views: 46 P Perry Babin Member Joined 2003 bcae1.com 2024-08-30 11:16 pm #2 2024-08-30 11:16 pm #2 Black meter probe on the negative rail. DCV on pin 2 of the 21844? H Hexhclass Member Joined 2010 2024-08-31 4:40 pm #3 2024-08-31 4:40 pm #3 0.332v on pin 2 P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 5:14 pm #4 2024-08-31 5:14 pm #4 Is the amp in protect mode? H Hexhclass Member Joined 2010 2024-08-31 6:30 pm #5 2024-08-31 6:30 pm #5 No Relay is turning on ,regulated voltage looks ok. P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37 You must log in or register to reply here. Share: Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link
There is no rail to rail oscillation on the outputs.I see a square wave on pin one of the 21844. 12v on the vcc pin is there. I replace the IC no change. Any suggestions?
P Perry Babin Member Joined 2003 bcae1.com 2024-08-30 11:16 pm #2 2024-08-30 11:16 pm #2 Black meter probe on the negative rail. DCV on pin 2 of the 21844? H Hexhclass Member Joined 2010 2024-08-31 4:40 pm #3 2024-08-31 4:40 pm #3 0.332v on pin 2 P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 5:14 pm #4 2024-08-31 5:14 pm #4 Is the amp in protect mode? H Hexhclass Member Joined 2010 2024-08-31 6:30 pm #5 2024-08-31 6:30 pm #5 No Relay is turning on ,regulated voltage looks ok. P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37 You must log in or register to reply here. Share: Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link
H Hexhclass Member Joined 2010 2024-08-31 4:40 pm #3 2024-08-31 4:40 pm #3 0.332v on pin 2 P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 5:14 pm #4 2024-08-31 5:14 pm #4 Is the amp in protect mode? H Hexhclass Member Joined 2010 2024-08-31 6:30 pm #5 2024-08-31 6:30 pm #5 No Relay is turning on ,regulated voltage looks ok. P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37 You must log in or register to reply here. Share: Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link
P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 5:14 pm #4 2024-08-31 5:14 pm #4 Is the amp in protect mode? H Hexhclass Member Joined 2010 2024-08-31 6:30 pm #5 2024-08-31 6:30 pm #5 No Relay is turning on ,regulated voltage looks ok. P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37 You must log in or register to reply here. Share: Facebook X (Twitter) LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link
H Hexhclass Member Joined 2010 2024-08-31 6:30 pm #5 2024-08-31 6:30 pm #5 No Relay is turning on ,regulated voltage looks ok. P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37 You must log in or register to reply here.
P Perry Babin Member Joined 2003 bcae1.com 2024-08-31 6:33 pm #6 2024-08-31 6:33 pm #6 Is the circuit like this? If so, check the equivalent of Q51 and Q52. Attachments AQ20_SCH.pdf AQ20_SCH.pdf 291.8 KB · Views: 37
