Greetings,
I’m interested in building a headphone amplifier in a rack-mount box. The architecture would look like this:
1) A multipole switch to select one stereo pair of balanced inputs from among 3-4 choices,
2) Two balanced line receivers for the selected stereo pair,
3) A stereo volume control
4) a stereo headphone amplifier
I need to simplify the construction process, so I’d be interested in finding pre-built modules for the line receivers and power amplifiers.
I’ll look for a power supply module as well, I assume with +/- supplies.
The purpose of my post is to seek advice and/or recommendations for the components:
I’ve already got a great 4-pole multi-throw rotary switch for the selector.
I recall buying some balanced line receiver modules using THAT line receivers, but the modules are now discontinued. Any suggestions?
I see a variety of headphone amplifier modules. I’m not sure that paralleled 5534’s would meet current demands in all cases. And I need to make sure that I can drive stereo headphones that share a common ground terminal. I need to drive low-impedance as well as high-impedance headphones to a moderately high sound level (but not hearing damage levels!)
I managed to find a headphone amplifier on a board with balanced inputs, but I need to add a volume control. Putting the volume control ahead of the board would require a balanced attenuator, for which it is expensive to maintain CMRR. Affecting the gain of the amplifier with a modification (i.e., vary the gain setting resistors) could degrade CMRR and perhaps degrade the stability of the amplifier. Besides, doing two balanced channels would require a 4-gang pot.
Here is that item: https://www.mouser.com/ProductDetai...9TiaZ2VIN468UPyuaLWSlrPcRqonNVOUaAsX6EALw_wcB
Maybe I could use the board above and add a good balanced receiver and volume control in front of it? Or maybe consider a different choice for the headphone amp?
Tom
I’m interested in building a headphone amplifier in a rack-mount box. The architecture would look like this:
1) A multipole switch to select one stereo pair of balanced inputs from among 3-4 choices,
2) Two balanced line receivers for the selected stereo pair,
3) A stereo volume control
4) a stereo headphone amplifier
I need to simplify the construction process, so I’d be interested in finding pre-built modules for the line receivers and power amplifiers.
I’ll look for a power supply module as well, I assume with +/- supplies.
The purpose of my post is to seek advice and/or recommendations for the components:
I’ve already got a great 4-pole multi-throw rotary switch for the selector.
I recall buying some balanced line receiver modules using THAT line receivers, but the modules are now discontinued. Any suggestions?
I see a variety of headphone amplifier modules. I’m not sure that paralleled 5534’s would meet current demands in all cases. And I need to make sure that I can drive stereo headphones that share a common ground terminal. I need to drive low-impedance as well as high-impedance headphones to a moderately high sound level (but not hearing damage levels!)
I managed to find a headphone amplifier on a board with balanced inputs, but I need to add a volume control. Putting the volume control ahead of the board would require a balanced attenuator, for which it is expensive to maintain CMRR. Affecting the gain of the amplifier with a modification (i.e., vary the gain setting resistors) could degrade CMRR and perhaps degrade the stability of the amplifier. Besides, doing two balanced channels would require a 4-gang pot.
Here is that item: https://www.mouser.com/ProductDetai...9TiaZ2VIN468UPyuaLWSlrPcRqonNVOUaAsX6EALw_wcB
Maybe I could use the board above and add a good balanced receiver and volume control in front of it? Or maybe consider a different choice for the headphone amp?
Tom