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Old 1st April 2015, 09:52 PM   #1
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Default L10 amplifier need VI limiter

here is the schematic of the L10 amplifier
Google Image Result for http://img.alibaba.com/img/pb/193/955/303/303955193_686.jpg

anybody willing to help me adding a VI limiter on it ?
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Old 2nd April 2015, 12:38 AM   #2
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Default 2SC5200_VI limiter

Try this.
O/P device temp Tc = 50 degC
Vbe Q2 = 0.6V (If you need a lower Vbe, let me know)
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File Type: pdf SOAR_2SC5200_50V_0.22.pdf (36.7 KB, 75 views)
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Old 2nd April 2015, 10:11 AM   #3
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ok ...seen it

idea is like that ... convert the amp to a typical Chinese pro amp
run it of 63 v rails (may be bit more ) gain headroom and power up to a point and at easy loads and hard limit the OPS if things are turning worst for the amp like 4 ohms load or too reactive.

this is my target for the specific application .
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Old 8th April 2015, 09:54 AM   #4
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Just notice that the kit i have features TTC1943 and TTA 5200 ...i expect that these are nowhere to be trusted so i was thinking on taking them away and replace them with 21193-4

so the all think will now need to be recalculated

Kind regards
Sakis
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Old 8th April 2015, 10:55 AM   #5
Pingrs is offline Pingrs  United Kingdom
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Quote:
Originally Posted by east electronics View Post
Just notice that the kit i have features TTC1943 and TTA 5200 ...i expect that these are nowhere to be trusted so i was thinking on taking them away and replace them with 21193-4

so the all think will now need to be recalculated

Kind regards
Sakis
A much better choice for 63V. Will re-calculate, if you wish?
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Old 8th April 2015, 11:34 AM   #6
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Please i would like to ...

Would you work on the circuit as given above or you are working on something else ...

also for this schematic i noticed that there VI lim that work directly on the base of the driver where others work in the resistor behind the base

Could you comment that please ?
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Old 8th April 2015, 12:28 PM   #7
Pingrs is offline Pingrs  United Kingdom
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Download Michael Kiwanuka's article on VI limiters from Bonsai's site. His Fig 1 shows the trigger transistor feed at the driver base, after the resistor Rs.
I've created macro's for most of the VI arrangements he describes, using his analysis method. MK's preference appears to be Fig 28, the zener arrangement I offered above. For 63V, however, a triple slope might be desirable.
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Old 11th April 2015, 09:19 AM   #8
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Guys ...can i really get some help here ?

Been spending almost 3 days on MK paper and my neither my English is enough to understand it properly nor my math is to come up with usable calculation or to come up with a usable schematic since i cannot really understand why schematic B next to schematic A .

My output will be 21193-4 , my rails are 65+65 at absolutely no load conditions ( DC) and my emitter resistors are 0.22

thanks
Sakis
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Old 11th April 2015, 10:43 AM   #9
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Quote:
Originally Posted by east electronics View Post
.....why schematic B next to schematic A .

thanks
Sakis
What does this mean?

Further post to follow.
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Old 11th April 2015, 10:52 AM   #10
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in MK paper we start from the most simple version and we end up to very sophisticated circuits
How do i choose what is right for my application ??
Which circuit will behave better according to my demands ?
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