Amp powers up and produces rail and regulated voltages .
Amp has no output .
I do not get any rail to rail oscillation on the outputs .
Any ideas on where to start
Amp has no output .
I do not get any rail to rail oscillation on the outputs .
Any ideas on where to start
Are all of the voltages marked in front of the audio driver board present and correct?
Are there any parts on the back of that board?
Are there any parts on the back of that board?
+12V: -112.8
+ Low: -6.11
SW: -6.15
-Low:-125.8
-VCC:-125.6
Gnd: -6.40
ST:-4.33
Mute:-120.2
+5: -121.2
-VCC:-126.0
Gnd:-6.51
IN:-6.80
This is what I get on the pins of the audio driverboard using amps ground terminal as reference.
There are no components on the back of the audio driver board
+ Low: -6.11
SW: -6.15
-Low:-125.8
-VCC:-125.6
Gnd: -6.40
ST:-4.33
Mute:-120.2
+5: -121.2
-VCC:-126.0
Gnd:-6.51
IN:-6.80
This is what I get on the pins of the audio driverboard using amps ground terminal as reference.
There are no components on the back of the audio driver board
Leaving the negative speaker terminal grounded, if you drive a signal into the amp, do you see audio on the positive speaker terminal?
R-R oscillation?
Do you see any signal on the input pin of the driver board when driving a signal into the amp?
Do you see any signal on the input pin of the driver board when driving a signal into the amp?
I do not have rail to rail oscillation on the outputs .
I see a distorted square wave on the in pin of the audio board .
If I adjust the gain on the amp the square wave cleans up but still a square wave on the input pin
I see a distorted square wave on the in pin of the audio board .
If I adjust the gain on the amp the square wave cleans up but still a square wave on the input pin
Repost the list of voltages that you did previously but use two references. For all voltages ±20v, use the primary ground. For all others, use the negative rail.
Put this in two different lists.
Leave the ground on the negative speaker terminal.
Put this in two different lists.
Leave the ground on the negative speaker terminal.
So use ground terminal for voltages above 20 volts and use negative rail for voltages 20 volts and below ?
There will be voltages that are near ground (within ±20v). Those are referenced to the secondary ground (which is currently tied to the primary ground).
The voltages that are near the negative rail are referenced to the negative rail so you have to use the negative rail as the reference.
The voltages that are near the negative rail are referenced to the negative rail so you have to use the negative rail as the reference.
+12V:-12.03 Negative rail as reference
+low:125.1. Negative rail as reference
SW: 124.9. Negative rail as reference
-LO:-125.6. Amps ground terminal as reference
-VCC-125.4. Amps ground terminal as reference
Gnd:0.00. Ground terminal as reference
ST: 127.2. Negative rail
Mute:5.40 Negative rail
+5:4.90. Negative rail
-VCC:-125.0. Negative rail
Gnd:0.00. Ground terminal
ST:125.7. Ground terminal
Hope this makes sense
If you need a specific pin on a different ground point let
Me know and I will re measure
+low:125.1. Negative rail as reference
SW: 124.9. Negative rail as reference
-LO:-125.6. Amps ground terminal as reference
-VCC-125.4. Amps ground terminal as reference
Gnd:0.00. Ground terminal as reference
ST: 127.2. Negative rail
Mute:5.40 Negative rail
+5:4.90. Negative rail
-VCC:-125.0. Negative rail
Gnd:0.00. Ground terminal
ST:125.7. Ground terminal
Hope this makes sense
If you need a specific pin on a different ground point let
Me know and I will re measure
I guess I’m stupid
I don’t know what pins are suppose to be near ground and what pins are near negative rail .
Since I don’t know which ones to reference
I don’t know what pins are suppose to be near ground and what pins are near negative rail .
Since I don’t know which ones to reference
Wondering if I can ask for a lil help with this amp .
I’m learning as I go
There are 12 pins on the audio driverboard .
Which ones need to be referenced to secondary ground and what pins need to be referenced to negative rail ?
Pins are as followed
+12
+LO
SW
-LO
-VCC
GND
ST
Mute
+5
-VCC
GND
IN
I’m learning as I go
There are 12 pins on the audio driverboard .
Which ones need to be referenced to secondary ground and what pins need to be referenced to negative rail ?
Pins are as followed
+12
+LO
SW
-LO
-VCC
GND
ST
Mute
+5
-VCC
GND
IN