Hi Zang,
I love it, too.
I replaced the opamps (OPA2134) in my KR Audio Preamp with LM4562. It was an very audible improvement.
The "secret" for the use of LM4562 in a preamp is the following structure: input - 1st gain stage - pot - 2nd gain stage - output
The single use like pot + gain stage or buffer isn't satisfying (to my ears).
I love it, too.
I replaced the opamps (OPA2134) in my KR Audio Preamp with LM4562. It was an very audible improvement.
The "secret" for the use of LM4562 in a preamp is the following structure: input - 1st gain stage - pot - 2nd gain stage - output
The single use like pot + gain stage or buffer isn't satisfying (to my ears).
Hi Thomas,
Thank you for your idea🙂I will try it later.
the attached is my sch file.it is a DC amp.I keep it simple.
greetings from beijing,
Zang
Thank you for your idea🙂I will try it later.
the attached is my sch file.it is a DC amp.I keep it simple.
greetings from beijing,
Zang
The attached is my layout.
Consideration below:
1,the layout as compact as possible.
2,easy installation into a source or power amp.
3,smt & PDIP footprint.
4,simple power supply bypass.
5,big ground plate around opamp foot.
Consideration below:
1,the layout as compact as possible.
2,easy installation into a source or power amp.
3,smt & PDIP footprint.
4,simple power supply bypass.
5,big ground plate around opamp foot.
OK,
R1,3----------------1.2K
R2,4----------------100K
R5,6----------------39K
R7,8----------------415K
R9,10---------------12R
U1,2-----------------LM4562
C1,2,3,4,-----------35uf/25V
THE UNIT SHOULD RUN IN A BIT OF DAYS.
ZANG
R1,3----------------1.2K
R2,4----------------100K
R5,6----------------39K
R7,8----------------415K
R9,10---------------12R
U1,2-----------------LM4562
C1,2,3,4,-----------35uf/25V
THE UNIT SHOULD RUN IN A BIT OF DAYS.
ZANG
Hi Digi,
why run the signal through two stages of opamp?
Doing it the way you have will make conversion to Tolu's suggestion fairly easy.
Did you try a film or ceramic cap direct across V+ to V-? maybe 1uF
why run the signal through two stages of opamp?
Doing it the way you have will make conversion to Tolu's suggestion fairly easy.
Did you try a film or ceramic cap direct across V+ to V-? maybe 1uF
because i want the preamp driving lowZ headphones.this capability is very useful at live playing.
example:when i play my yamaha keyboard,i want monitoring the playback via a headphone.and the line out can work together.
as the datasheet shown,the lm4562 chip can drive complex loads,but it is no good for lowZ loading.so i do a circuit bending.
i have try a film cap direct across V+ to V- on some solid amp that is good.i will try it on this preamp later,thank you!
zang
example:when i play my yamaha keyboard,i want monitoring the playback via a headphone.and the line out can work together.
as the datasheet shown,the lm4562 chip can drive complex loads,but it is no good for lowZ loading.so i do a circuit bending.
i have try a film cap direct across V+ to V- on some solid amp that is good.i will try it on this preamp later,thank you!
zang
- Status
- Not open for further replies.