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Anyone tried to build LME49600 Headphone Amplifier Evaluation Board??
Anyone tried to build LME49600 Headphone Amplifier Evaluation Board??
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Old 13th January 2018, 09:11 AM   #11
abraxalito is offline abraxalito  United Kingdom
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You want specific components? If so then try a TDK SLF7045T-102 (1mH) and a Nichicon HZ 1000uF/16V. This combination does a great job in my circuits.
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Old 13th January 2018, 09:51 AM   #12
edwtsui is offline edwtsui  Hong Kong
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Quote:
Originally Posted by abraxalito View Post
You want specific components? If so then try a TDK SLF7045T-102 (1mH) and a Nichicon HZ 1000uF/16V. This combination does a great job in my circuits.
No. Sorry.
I mean the schematic example of the LC filter. Or simply the schematic of power supply circuit
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Old 13th January 2018, 10:13 AM   #13
abraxalito is offline abraxalito  United Kingdom
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Here's the schematic, its not that complicated - you'll normally need two of these, one for each rail.

On the left that's your input (shown as a voltage source) which is the LME supply, the output to the opamp is to the right.
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File Type: png LCfilter.png (2.4 KB, 189 views)
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Old 13th January 2018, 02:03 PM   #14
edwtsui is offline edwtsui  Hong Kong
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Quote:
Originally Posted by abraxalito View Post
Here's the schematic, its not that complicated - you'll normally need two of these, one for each rail.

On the left that's your input (shown as a voltage source) which is the LME supply, the output to the opamp is to the right.
Thanks for your help.

In my design, I planned to use two LME49710 and LME49600/BUF634 (For one channel). One LME49710 serve as voltage gain and the other one serve as DC servo, so I need to separate each one with LC filter as the schematic attached??
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File Type: jpg LC.jpg (116.9 KB, 183 views)
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Old 13th January 2018, 05:03 PM   #15
scafas is offline scafas  Italy
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Default info pcb

if interest , i have some of this pcb to buid a lm49600 headamp.
the schematic is take from original datasheet and i have add a dual voltage psu on board with 7815 and 7915.
pcb is 100x100 mm. , double layer with a stereo pot in like 2x50kohm alps.
Click the image to open in full size.
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Old 13th January 2018, 11:10 PM   #16
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by edwtsui View Post
In my design, I planned to use two LME49710 and LME49600/BUF634 (For one channel). One LME49710 serve as voltage gain and the other one serve as DC servo, so I need to separate each one with LC filter as the schematic attached??
No, you'll only need two filters (so two Ls, two Cs) unless you're adopting separate L,R channel construction (when you'll need four). Both the LME49710 on a single channel can be powered on the same rails as their outputs are barely loaded.

On the schematic you've shown you only need L1 and L4 and C1,C4. L2,L5,L3,L6 are replaced with wires and C2,C3,C5,C6 are omitted.
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Last edited by abraxalito; 13th January 2018 at 11:14 PM.
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