it needs a positive and a negitive rail in order to give both amplitude sides of the signal in this schematic so yor idea will not work unles you have a separate power suply for you opamp (something you want to delete in this schematic)
So, how exactly do you think I could get it to work off USB power? I have seen it done, but not 100% sure how
Thanks
EDIT: ahh, I see how it gets the + and - supply. Well, do you think, if U just removed the 1K resistor, and gave it 2 supplies from the USB, where the 15V is supposed to go, will that work? Or do I need a power supply capable of + and - 5V? (Is USB not?)
The circuit is a dual-supply op amp inverting amplifier. Your idea will not work (at least, not without further changes) because in this configuration, the op amp requires a positive voltage (Vcc), a negative voltage (Vdd) and a ground exactly halfway between the two. Your idea would leave you with a positive supply and ground.
[Edit: Actually that's not true. It would leave you with ground and *no* positive or negative supply.]
You either need to provide a split supply as shown (which is given in your schematic by the section you want to bypass) or use a single-supply op amp configuration.
An excellent diagram by audioguru to address this issue has been posted as a sticky in General Electronics Chat.
I think you should look at another op amp besides the TL072 as well. The TL072 is spec'd only down to 7V total supply voltage. You have 5V. It will work poorly and unreliably if it works at all. Audioguru has in the past recommended the MC34071 to me, which looks good.
Where did you get get the circuit? Did you design it or download it? Perhaps there is another which would suit your purpose better. It would also be easier to help if you described exactly what you are trying to do, instead of how you think you should do it.
Hi. Well, I have found a source of + and - 15V I can use. So, would I be able to hook the +15 up to pin 8 on the opamp directly, and the - to the 1K res. directly? Or does it need the dual supply and ground inbetween?
Hi. Well, I have found a source of + and - 15V I can use. So, would I be able to hook the +15 up to pin 8 on the opamp directly, and the - to the 1K res. directly? Or does it need the dual supply and ground inbetween?
Now, for the output, it has a single output. So, i'd use that, but what is the other connection go to? ground? I believe its supposed to output +/-5V or -/+5V
Now, for the output, it has a single output. So, i'd use that, but what is the other connection go to? ground? I believe its supposed to output +/-5V or -/+5V
I have a 8 channel USB sound card. Basically, I am just using it for its DAC chip. So, I have soldered wires to the direct output of the DAC chip (Right before the filter capacitors)
the circuit is then supposed to amplify it abit, then output it, but at a higher level, so I get a -5 to +5 (I think) output signal. In the circuit, it only shows 1 signal input, and 1 signal output. I was wondering what I hooked the signal out - or gnd to. the usb sound card maybe?
I have a 8 channel USB sound card. Basically, I am just using it for its DAC chip. So, I have soldered wires to the direct output of the DAC chip (Right before the filter capacitors)
I was just writing a post to say to ignore my last post since I just went back and re-read your original post. Sorry.
the circuit is then supposed to amplify it abit, then output it, but at a higher level, so I get a -5 to +5 (I think) output signal. In the circuit, it only shows 1 signal input, and 1 signal output. I was wondering what I hooked the signal out - or gnd to. the usb sound card maybe?
I have one question: what filter capacitors? Are there filters on the outputs? What is the name of the sound card?
Anyway, I'd take the output line from the DAC (I'll call that "DAC OUT") and connect that to the input on your amplifier circuit ("AMP IN"). "Gnd" on the DAC board goes to the gnd on your amplifier circuit.
Can you quickly draw out what you mean by that? Your description is too brief and unclear so I'm not going to recommend you wire it like that unless I know exactly what you mean. A picture will work better than words.
Sorry, but it's just that I don't want to agree to something, and find out later I misunderstood you and your sound card melted.
I don't know what you mean by 'the "-" of the output signal". The output signal from your amplifier (which presumably you will hook up to some other equipment) is the output from the op amp, and gnd on the amplifier circuit will connect to gnd on whatever you hook it up to.
Again, what do you mean by "filter capacitors"? Do you mean that the sound card outputs are AC coupled and you are referring to coupling capacitors? Are they simply in series directly between the DAC outputs and the physical connectors?