https://lib.chipdip.ru/126/DOC001126730.pdf - Here's the data sheet.
Have breadboarded but can't get this to work. There's crackling and some buzzing some noise when i poke around, but signal isn't getting through. I think there are some fundamental concepts that I am missing
On page 5 of the linked data sheet useage notes it says - • Please connect only the ground of signal source with the signal GND of the amplifier in the previous stage. The problem is I don't as yet have a previous stage ( i plan on building a preamp). At this point I just have phono jack and guitar lead - just trying to get some noise to come out.
When you look at the Application example and Circuit/pcb example pattern on page 9, it shows that, especially on the pcb, that every resistor/cap on pins 5-9 are connected to GND (input) - which I interpret to definitely not be pin 3 of the chip (GND pin). I have interpreted that to mean the ground pin of my phono jack, i have just placed that on the line of my breadboard and then plugged in those resistors/caps to the same line a kind of floating virtual ground??. Also tried the ground rail on my breaboard with pin 3 of the chip connected, didn't work either.
As for the volume pot..I'm confused about that as well (surprise surprise Normally I would connect the signal to centre pin of pot, run a wire to the input, and other to gnd rail. Could I still do it that way?? Or should I use pin 9 which is a dedicated volume pin. How would I use pin 9..my guess is that you only connect 2 pins of the pot, but which 2 and how?
Could anyone tell me what I'm doing wrong here. I have 8ohm speaker attached, with a 7.9v supply, no heatsink but chip not really getting warm as yet.
I do have a heatsink for the chip, and eventually plan to run at 12v.
any help, much appreciated.
cheers
Steve
Have breadboarded but can't get this to work. There's crackling and some buzzing some noise when i poke around, but signal isn't getting through. I think there are some fundamental concepts that I am missing
On page 5 of the linked data sheet useage notes it says - • Please connect only the ground of signal source with the signal GND of the amplifier in the previous stage. The problem is I don't as yet have a previous stage ( i plan on building a preamp). At this point I just have phono jack and guitar lead - just trying to get some noise to come out.
When you look at the Application example and Circuit/pcb example pattern on page 9, it shows that, especially on the pcb, that every resistor/cap on pins 5-9 are connected to GND (input) - which I interpret to definitely not be pin 3 of the chip (GND pin). I have interpreted that to mean the ground pin of my phono jack, i have just placed that on the line of my breadboard and then plugged in those resistors/caps to the same line a kind of floating virtual ground??. Also tried the ground rail on my breaboard with pin 3 of the chip connected, didn't work either.
As for the volume pot..I'm confused about that as well (surprise surprise Normally I would connect the signal to centre pin of pot, run a wire to the input, and other to gnd rail. Could I still do it that way?? Or should I use pin 9 which is a dedicated volume pin. How would I use pin 9..my guess is that you only connect 2 pins of the pot, but which 2 and how?
Could anyone tell me what I'm doing wrong here. I have 8ohm speaker attached, with a 7.9v supply, no heatsink but chip not really getting warm as yet.
I do have a heatsink for the chip, and eventually plan to run at 12v.
any help, much appreciated.
cheers
Steve