Sorry I did not read entire thread, so maybe someone mentioned about this.
Is this a common way to connect signal ground? It goes to amp board and PSU board and the chassis ground.
Also sorry for my novice question: what's the purpose of D13 and D14 diodes that going across output transistors?
That's not what I see.
The diode between Out and circuit becomes reverse biased when the OUT goes high.
The resistor supplies current to the LED. The LED is ON.
If Out is near GND voltage the diode does nothing, it might be reverse biased, or slightly forward biased. No effect on LED operation.
If OUT is heavily negative, the diode is forward biased and pulls the circuit negative.
Now no current flows through the LED, instead the current flows through the OUT diode.
The Diode turns the LED OFF, when OUT goes -ve.
The diode between Out and circuit becomes reverse biased when the OUT goes high.
The resistor supplies current to the LED. The LED is ON.
If Out is near GND voltage the diode does nothing, it might be reverse biased, or slightly forward biased. No effect on LED operation.
If OUT is heavily negative, the diode is forward biased and pulls the circuit negative.
Now no current flows through the LED, instead the current flows through the OUT diode.
The Diode turns the LED OFF, when OUT goes -ve.
pardon me, but i was not able to locate the video. it took me to your facebook page.
reg
Prasi
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