XHS - Xtra High Speed Design

[vzaichenko]

Do you have any advice on transistors heatsinking or coupling?

Marc

With +/-50V rails no heatsinks required. With +/-75V - Q29, Q30 - small local heatsinks are recommended.

It is recommended to place the transistors in the following pairs close to each other:
- Q1, Q9
- Q12, Q20
- Q2, Q7
- Q14, Q19
- Q4, Q10
- Q11, Q16
- Q24, Q26

 

[JonSnell Electronic]

We are talking audio, not video? Human ears hear up to, if one is young, 18kHZ and over 50's lucky to get to 12kHZ.
Why worry about it?

 

[jwilhelm]

We are talking audio, not video? Human ears hear up to, if one is young, 18kHZ and over 50's lucky to get to 12kHZ.
Why worry about it?

Did I miss something? Worry about what?

 

[volavola]

what luck go sleep now

We are talking audio, not video? Human ears hear up to, if one is young, 18kHZ and over 50's lucky to get to 12kHZ.
Why worry about it?

Hello JonSnell
Today I worked till 23. I can't solder SMD part. I can hear above 12KHz. But.... I feel lucky
Go ahead vzaichenko

 

[vzaichenko]

We are talking audio, not video? Human ears hear up to, if one is young, 18kHZ and over 50's lucky to get to 12kHZ.
Why worry about it?

Hi JonSnell, looks like I have also missed something

This is my rather old design yet still good. Low distortion and easily repeatable even without components matching. At that time I considered it "high-speed", although I've got a number of much higher-speed designs since then.
Saying "high-speed", I mean the slew rate, not the bandwidth (although, it's also relatively wide for the reason).

Cheers,
Valery

 

[vzaichenko]

Looks great what is the Measured slewrate?
☺

Actually, with the present compensation, which is more aggressive now, comparing to the initial setup (increasing stability margins and making the design easily repeatable), the slew rate is not that high - around 20V/uS.