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Old 11th April 2013, 12:10 PM   #61
sajti is online now sajti  Hungary
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This is my amplifier, which use bjt input stage. 110W/8ohm output, with THD:0.0008% simulated.
And it contains the protection too.


Sajti
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Last edited by sajti; 11th April 2013 at 12:15 PM.
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Old 11th April 2013, 01:34 PM   #62
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....... @Karl vd Berg for you ,and not only ,here in attachment , it's an updated PCB, rev 1.5 .....
Regards Alex.
Very nice!

The specs must outperform many stock amps??
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Old 13th April 2013, 07:14 PM   #63
400kg is offline 400kg  Turkey
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my pcb protoype
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Old 16th April 2013, 10:13 AM   #64
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Thanks for the offer but I don't have need of SOA limiters (if that's what you refer to) in domestic amplifiers. Perhaps I should say that I couldn't sell hi-fi amplifiers if I declared that they were fitted with any type of them. I would agree that PA and instrument amps such as I have also built in small numbers, do need limiters because the average output levels, operating stresses, abuse and risks are relatively much greater. I've been fitting dual and multislope SOA protection to these amps for quite some years because I have seen the damage caused by failures in them and the frequency with which it occurs. If your paper discusses something non-invasive and radically different in operating mode to dual or multislope limiters, I would be grateful to see it.

Actually, a properly designed SOA protection circuit should be inert when not invoked. Send me mail and I'll send you article on how to design them properly.
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Old 30th June 2013, 10:18 AM   #65
400kg is offline 400kg  Turkey
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Default completed module

finished module
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Last edited by 400kg; 30th June 2013 at 10:22 AM.
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Old 30th June 2013, 10:40 AM   #66
AndrewT is offline AndrewT  Scotland
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Actually, a properly designed SOA protection circuit should be inert when not invoked. Send me mail and I'll send you article on how to design them properly.
Yes.

A properly designed IV limiter or SOA protection MUST allow all valid signals to pass to all valid loads.

If one has an 8ohms speaker as the load and that particular speaker demands 30Apk on very rare occasions, then the amplifier that is used with that speaker should allow that 30Apk to pass to the speaker without the limiting interfering with the quality of the signal.
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Old 30th June 2013, 11:46 AM   #67
400kg is offline 400kg  Turkey
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Vtech audio Sapphire Amplifier - YouTube
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Old 30th June 2013, 09:17 PM   #68
Bensen is offline Bensen  Belgium
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Hi 400kg,

I see you are using 0,1R emitter resistors in the ops with three pairs of 2922/1216. I would like to use 0,1R or 0,15R for the same devices but with four pairs in parallel. With these values I can run the ops with 0,133 to 0,18bias current/device, this to achieve a nice class A output power.

But these values are looking rather small compared with other amp's using other output devices!?
Do you have any idea if the LAPT technology used in these Sanken devices are beter suited to use with rather low emitter resistors?

Any info is welcome!
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Old 1st July 2013, 08:47 AM   #69
AndrewT is offline AndrewT  Scotland
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Cordell did a piece on output device Thermal Stability.

Maybe the Cordell interviews - outputs Thread.
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Old 1st July 2013, 07:35 PM   #70
Bensen is offline Bensen  Belgium
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Thanks for the hint Andrew! We mostly forget to check the available documentation.
Douglas Self goes relative far into detail concerning the emitter resistor value in an ops.

I'll start with a 0,1R and see if I get it thermally stable.

Greetz
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