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amp 1000W/2000W, IRFP240/9240
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Old 5th July 2010, 12:42 PM   #61
XGAS is offline XGAS  Germany
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Eva:
All documantation for which are you asking for is on the web Zesilova? 1000W/2000W, HQQ-55-505W-10-1 , but in Czech language, just use Google Translator. I also highly recommend for a better "understanding" also see the following thread: Topology Federmann, HQQF-55 ...
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Old 5th July 2010, 03:33 PM   #62
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by Eva View Post
I wasn't able to find the schematic of the PCBs shown on your posts. However, I found similar schematics.

Since you seem to be aimed towards rack-mount medium-power professional audio amplifier style, I think that a few things are missing on your circuits:

- Short circuit protection (current limiting for a few sec, then mute if overcurrent condition persists)
- Protection against too low load impedance (same as above)
- Protection against RF on the output (oscillation)
- Driver transistors between the VAS and the output stage if needed. They are probably not strictly required, but are likely to result in a reduction of THD and output impedance at high frequencies (often overlooked, but high output impedance above 1khz results in speaker dependent tonal imbalance).
- Current limiting on the VAS or driver transistors to prevent damage to the VAS and drivers in case something becomes open or shorted on output stage, or in case input signal demands a too high slew rate.
- Protection against overheating (maybe fan control too). Required when using small heatsinks and relying on the low duty cycle of music signals.
Current limitation is realized Zener diode.
Current is controlled by a separate module.


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Old 5th July 2010, 03:39 PM   #63
Federmann is offline Federmann  Czech Republic
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Additional sources turn on relay K1. Relay K1 switches on the main transformer.
Failure comes to X9 ÷ X13. Relay K2 off the main transformer.
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Old 5th July 2010, 03:44 PM   #64
wahab is offline wahab  Algeria
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Quote:
Originally Posted by XGAS View Post
Eva:
All documantation for which are you asking for is on the web Zesilova? 1000W/2000W, HQQ-55-505W-10-1 , but in Czech language, just use Google Translator. I also highly recommend for a better "understanding" also see the following thread: Topology Federmann, HQQF-55 ...

Topology federmann ?...
A bit exagerated to give his name to a topology
he didn t invent at all , apart perhaps in his wildest dreams...
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Old 5th July 2010, 03:49 PM   #65
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by XGAS View Post
I also highly recommend for a better "understanding" also see the following thread: Topology Federmann, HQQF-55 ...
There are many attacks. There is no worthwhile text in Topology Federmann, HQQF-55 ...

Last edited by Federmann; 5th July 2010 at 03:51 PM.
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Old 5th July 2010, 03:55 PM   #66
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Federmann View Post
There are many attacks. There is no worthwhile text if Topology Federmann, HQQF-55 ...
Not at all...
When some people point a shortfall in one of your design,
you dissmiss them as uncompetent.

The absence of drivers after the VAS, that is a source
of (a lot of) distorsion has been pointed
many times by many people and recently by Eva,
yet , you still are doing as if it s attacks rather than
following the councel of people that did experiment
these topology long before you yourself done it.....
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Old 5th July 2010, 04:01 PM   #67
Federmann is offline Federmann  Czech Republic
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T7, LED1 and R6 is a source of constant current. VAS is a constant current flows.
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Old 5th July 2010, 04:09 PM   #68
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by wahab View Post
these topology long before you yourself done it.....
I know well.


I use overall feedback. I do not use local feedback. I use minimum transistor. This is my involvement varies.
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Old 5th July 2010, 04:12 PM   #69
Federmann is offline Federmann  Czech Republic
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I use the filter capacitors in the collector power transistors. I use the more current input differential pair.
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Old 5th July 2010, 04:20 PM   #70
Federmann is offline Federmann  Czech Republic
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Eva is good, they only attack Czech and Slovak friends.
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