LM4562 (dual op-amp) simple preamplifier

[carlmart]

With 6k8 I would use a good 10uF electro//2.2uF metallised film. Both are cheap and fairly small. These will give F-3db @ <2Hz.

If you could afford a Solen polypropylene it wouldn't be too large or expensive. A 12uF 400v type is 1.14 x 1.5 (29x38) and costs $5.10.

In any case that input cap is where you should put your money in.

 

[anatech]

Hi Dxvideo,
Your idea of using an LT1210 is flawed. The LT1210 is a very fast current feedback power op amp. It is capable of 1.1 amperes output. I am pretty sure you would need a different layout with much more care in decoupling.

As for your power amp, install a buffer on the input to raise the input impedance and include a DC blocking cap. This would be much safer and it might even sound better.

-Chris

 

[Dxvideo]

Hi Dxv,
for low bass passing through the power amp with least attenuation and phase change go for a big DC blocking cap on the input. With 6k8 I would use a good 10uF electro//2.2uF metallised film. Both are cheap and fairly small. These will give F-3db @ <2Hz.

I have four of 10uF 63v MKT type caps. I've used 4u7 MKT type for another project and happy with them. So I can use 10uFs for amplifier input with 100n parallelled...,

What are the resistors & caps at the amp input?

This is my circuit;
http://www.diyaudio.com/forums/showthread.php?s=&postid=1301290#post1301290

Your idea of using an LT1210 is flawed. The LT1210 is a very fast current feedback power op amp. It is capable of 1.1 amperes output. I am pretty sure you would need a different layout with much more care in decoupling.

Any canditate for that posisiton?

Thx ...

 

[Dxvideo]

Not much difference, but some simplified. Is that any good?

An externally hosted image should be here but it was not working when we last tested it.

 

[Dxvideo]

And a PCB design for all;

An externally hosted image should be here but it was not working when we last tested it.

PS: Component codes not related to circuit schematics.

 

[anatech]

Hi Dxvideo,

Any canditate for that posisiton?

Well, any higher current voltage feedback op amp would work well. The NJM4556 is specifically designed for driving headphones. It would be a wise choice. If you want one, all most all Japanese CD players use one. Pull one out of a scrap unit.

-Chris