Hello
I'm trying to build my first headphone amp from scratch and just getting familiar with Eagle. My goal is to make something small and easy with decent sound. Anyone care to critique my design ? Here are some questions I had
1. To make it adjustable should R2, R3 be made variable with a POT or should I add a gain stage at L-IN/R-IN prior to output stage ?
2. Do I need a unity-gain buffer at input stage to increase input impedance of design ?
dc
I'm trying to build my first headphone amp from scratch and just getting familiar with Eagle. My goal is to make something small and easy with decent sound. Anyone care to critique my design ? Here are some questions I had
1. To make it adjustable should R2, R3 be made variable with a POT or should I add a gain stage at L-IN/R-IN prior to output stage ?
2. Do I need a unity-gain buffer at input stage to increase input impedance of design ?
dc
Attachments
> make it adjustable
Does it need to go louder? Or softer? Or you do not know?
The datasheet is mildly helpful..... "...it is recommended that the effective impedance seen by the inverting node of the amplifier be set between 5kOhms and 20kOhms."
Try these values for gain of 3.
Does it need to go louder? Or softer? Or you do not know?
The datasheet is mildly helpful..... "...it is recommended that the effective impedance seen by the inverting node of the amplifier be set between 5kOhms and 20kOhms."
Try these values for gain of 3.
Attachments
PRR yes C1 is wrong. It should be connected to ground. I found that out later. By adjustable I mean volume. Isnt that done by adjusting the gain of the output stage ? Alternative would be to keep the output stage as is and add a gain stage at the input.
What is the 10K resistance ? Is that the input impedance present to the line input ?
What is the 10K resistance ? Is that the input impedance present to the line input ?
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