looking for "ultrafast power amp"

[lumanauw]

I'm looking for schematic of "ultrafast audio amplifier (#1+#2)) and "Non slewing audio power". Both are by Giovanni Stochino, and was in Wireless world/Electronic world Mar 1996, p256, May 1996, p410, Apr 1997, p278 , Aug 1998, p633.
I dont have any of those magazine.
Could anyone tell me where I can download it?

[jan.didden]

I don't think you can download it, but you can get back=issues here: http://www.softcopy.co.uk/mag/default.asp?dir=ew . Click on "audio".

Jan Didden

[Christer]

Searching the forum for Stochino immediately resulted in the
following thread Giovanni Stochino's ultra fast amp

Although it seems not to be quite the original schematic, the
thread contains this link
http://www.soton.ac.uk/~apm3/diyaudi...no_circuit.jpg

[phase_accurate]

Selamat Malam lumanauw

If you don't succeed in finding them I can at least a part of those articles as photocopies since I have a lot of old EW&WW issues.

Regards

Charles

[peranders]

Current feedback maybe?

http://homepages.strath.ac.uk/~cnbp111/amp1.html
http://www.diymania.net/pass/project/CF-Power.htm
http://www.analog.com/UploadedFiles/...17334AN211.pdf

BTW: I have the Giovanni pages somewhere. I'm not sure if I have the article or just the schematics.

[AKSA]

Hi Lumanauw,

Saya kira amplifier ini tak terbaik; ada yg lebih jelas. Coba Pass Aleph - tak ada global feedback!

Yth,

Hugh, isterinya orang Jawa.........

[li_gangyi]

wow~!!! I didn't know a guy in Australia could do Malay...cool~!!!

[lumanauw]

Haah? Phase Accurate and AKSA can speak Indonesian? Where are you guys from? Have been here? Istrinya AKSA orang Jawa, dari mana? Thank you for the replies
The reason I'm looking for those articles is to see how can we make a fast amp. What is the key secret. Once I heard a direct comparison between Crown power amp and MC2 (MCsquare)professional power amp. MC2 gives better sound. In the spec, the MC2 is very fast, damping very high. When I took a peek inside it, the circuit is very-very simple compared to Crown. The components and output devices is not as many as first I tought will be. It is the best if I can get the MC2 schematic. But I think I will never get MC2 schematic, since it is a high price-running production amp, so I tried different schematic to study. Maybe they are using the same principle.

[lumanauw]

I think the schematic in http://www.soton.ac.uk/~apm3/diyaud...ino_circuit.jpg is not a current feedback amp. It is ordinary voltage feedback amp.
Current feedback can make fast slew rate and high damping factor. But many dont like the sound it produces.
But is it the one that Stochino refer to "Ultra Fast Power Amp"?
Is it possible to make fast amp with ordinary voltage feedback?

[AKSA]

Hi Lumanauw (or is that Pak Lumayan??)

Istri lahir di Semarang, kerja di KOWAD di Jakarta. Kita menikah di catatan sipil di sana tahun 1983.......

A very high damping factor has little influence on the sound.

Most loudspeaker drivers are designed for voltage drive; with current feedback they don't give their best.

Cheers,

Hugh