Analog Devices BUF04 Buffers

[Ajit]

I have a few of these which I picked up on eBay a while ago. Much research on Google and the Forums do not turn up too much info, especially on application. There is a data sheet here . It is pin compatible with the BUF03. Has anyone worked with these? Can I use them as buffers in the contemporary circuits on the DIY Forum or would the circuits require too many modifications? I see Tomo had made a few passing references to it a while ago. Appreciate any help. Thank you!

 

[endia]

http://headwize.com/projects/showfil...awliw1_prj.htm

 

[tangent]

Quote:

Originally Posted by Ajit Can I use them as buffers in the contemporary circuits

If you're using PCBs made for some other buffer, the pinouts will require massaging, but other than that, you should be able to drop them into anything requiring a buffer. You may have incidental problems like oscillation to deal with, so it'll be best if you have access to a scope if you're going to go modding existing circuits like this.

 

[Ajit]

Thank you Endia and Tangent! I missed that on my search. I will check the pinout compatibility. I do have a scope so I will check it out. Thanks again!

 

[amb]

The BUF04 (DIP version) has the same input, output and power supply pinout as the BUF634P. The main difference is pin 1, which is for bandwidth control on the BUF634P, but on the BUF04 it is used for an (optional) DC offset nulling trimpot. So, it is possible to use the BUF04 on a PCB made for a BUF634P if you don't connect anything to pin 1. However, since the BUF04 has lesser specs than the BUF634P, there is very little reason to actually do that.

 

[Tomo]

Hi,

I found the specs for you here.

http://www.analog.com/en/prod/0%2C28...UF04%2C00.html

Unfortunately, like its predecessor BUF03, it is obsolete. It is a real shame considering it is one of very rare buffers which needs no feedback. BUF04 is a closed loop buffer while BUF634 is an open loop buffer. This just mean you can replace BUF634 with BUF04, but NOT the other way around.

Notice that it has 3000V/us Slew Rate, but it has 60mA~100mA output current capability.

I did not have the opportunity to use one since by the time I got the money it was obsolete. Major Bummer. Please tell us how it comes out. I would definitely like to know how your project turn out.

Cheers,

Tomo

 

[rickcr42]

Quote:

I did not have the opportunity to use one since by the time I got the money it was obsolete. Major Bummer. Please tell us how it comes out. I would definitely like to know how your project turn out.

Tomo,A lot of the older buffers ran deep int the class-a region so you see mostly what are now considered low output current specs for a buffer.mostly in the 60-70 ma range.
but man,they sound better than the current breed which is really what it is all about.The spec wh*res are always looking for the most of everytthing :
Most output current
Most bandwidth
Most slew rate
highest speed

not me man.I have used the BUF-02 and BUF-04 plus I still have a couple of Ceramic package LH0033 buffers floating around wating for something special to use them in.Ii have the others in a line driver and a headphone buffer.My LH0063 whips a*s but it is mounted on a board with the huge heat sinks and barrier strip in/out/ps connections because i never had the heart to put it to a dedicated use.looks too damn cool to hide in a chassis anyway.BIG multipin TO-3 type cans on heat sinks made especially to mount then of like 4X5 inches !
All the above may not compete on paper with modern buffers but they sound great !

BTW-About as close as you can come to the old buffers are some of the current feedback opamps in the 60-70ma range but they do not have the integrated cooling options of the older buffers