Hi guys,
Can anyone suggest a compact, affordable line buffer for my 100as2 boards (1.8k input impedance!) To allow me to use a regular log pot volume control.
I need 8 channels worth, so something like a b1 for every channel would obliterate my bank account.
I'm pretty new to the non speaker side of DIY audio, so pre-populated pcb's would be ideal, but I can solder up some boards as long as there's no tiny surface mount bits.
Can anyone advise at things I should be looking at, matching power supplies would be awesome too!
Can anyone suggest a compact, affordable line buffer for my 100as2 boards (1.8k input impedance!) To allow me to use a regular log pot volume control.
I need 8 channels worth, so something like a b1 for every channel would obliterate my bank account.
I'm pretty new to the non speaker side of DIY audio, so pre-populated pcb's would be ideal, but I can solder up some boards as long as there's no tiny surface mount bits.
Can anyone advise at things I should be looking at, matching power supplies would be awesome too!
I would modify the 100as2 board to lower input capacitance and find the 1,8k resistor and put some higher value there. Way easier as build new boards and buffers and power supply and ...
A TL072 or better unity gain buffer per channel, to handle + and - signals.
Up to 1M input impedance if you wish (not actually needed but to show capabilities), ruler flat, vanishing distortion (certainly nothing you can hear), ruler flat from DC up to 1MHz, very low noise and even better with choice Op Amps (which still cost a couple bucks each), up to 9V RMS if fed with standard +/-15V, very low output impedance, although it´s customary to add a 100 ohm resistor in series with each for stability purposes,will EASILY drive IcePower 1k8 balanced inputs, what´s not to like?
Being very simple, if no boards available (there "should" be some), it can be built on Veroboard or stripboard (same thing).
http://www.learningaboutelectronics.com/Articles/Unity-gain-buffer
Turns THIS:
into THIS:
Up to 1M input impedance if you wish (not actually needed but to show capabilities), ruler flat, vanishing distortion (certainly nothing you can hear), ruler flat from DC up to 1MHz, very low noise and even better with choice Op Amps (which still cost a couple bucks each), up to 9V RMS if fed with standard +/-15V, very low output impedance, although it´s customary to add a 100 ohm resistor in series with each for stability purposes,will EASILY drive IcePower 1k8 balanced inputs, what´s not to like?
Being very simple, if no boards available (there "should" be some), it can be built on Veroboard or stripboard (same thing).
http://www.learningaboutelectronics.com/Articles/Unity-gain-buffer
Turns THIS:
into THIS:
I wouldn't, if bel canto decided a line buffer was the best solution when they used icepower boards, then that's probably the best solution for me too. And it's not like these come with a schematic.
I'd assume this is effectively the same as using a fet powered opamp in the little line buffer I've ordered the bits for? A Nelson b1 would be prohibitively expensive and large.
A TL072 or better unity gain buffer per channel, to handle + and - signals.
Up to 1M input impedance if you wish (not actually needed but to show capabilities), ruler flat, vanishing distortion (certainly nothing you can hear), ruler flat from DC up to 1MHz, very low noise and even better with choice Op Amps (which still cost a couple bucks each), up to 9V RMS if fed with standard +/-15V, very low output impedance, although it´s customary to add a 100 ohm resistor in series with each for stability purposes,will EASILY drive IcePower 1k8 balanced inputs, what´s not to like?
Being very simple, if no boards available (there "should" be some), it can be built on Veroboard or stripboard (same thing).
http://www.learningaboutelectronics.com/Articles/Unity-gain-buffer
Turns THIS:
into THIS:
I'm currently using an unbalanced source, but if I'm not happy with the performance with the unbalanced unity gain line buffer design I've gone for (waiting on pcb's) this might be something to look at. Thanks
this one
https://theslowdiyer.wordpress.com/2013/09/02/project-files-opamp-buffer-for-icepower-asx-modules/
It's my first ever time getting pcb's made or even populating one, so i wanted to keep it nice and simple.
