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Old 1st August 2007, 12:39 AM   #21
Bee C. is offline Bee C.  Indonesia
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Quote:
Originally posted by anatech
Hi Bee C.,

From me earlier ....


Right now your gain is attempting to be infinite, or open loop with only DC feedback in practical terms. In any event, it's not going to be a happy amp without some gain here.

I haven't looked that far into your amp. I just know there are some very basic things you need to get right first. Run at a lower voltage until it's running, then reduce the bias current and raise the voltage. Reset your bias current at this new voltage.

-Chris



Heee..he...he...
The PIC looks good.I can save to JPEG format
but How to insert thge image on to the text ?

Anatech u mind i should add the series resistor like this ?{attach image}
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Old 1st August 2007, 12:43 AM   #22
Bee C. is offline Bee C.  Indonesia
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Default Bad Picture ???

Quote:
Originally posted by Bee C.





Heee..he...he...
The PIC looks good.I can save to JPEG format
but How to insert thge image on to the text ?

Anatech u mind i should add the series resistor like this ?{attach image}
The Picture is
Too bad .....
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Old 1st August 2007, 12:50 AM   #23
anatech is offline anatech  Canada
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Hi Bee C.,
Oui!

That's what I meant. The degeneration resistors may not be required. That is fine tuning. Get it working first and only change one thing at a time (so you know what worked and what didn't).

-Chris
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Old 3rd August 2007, 02:26 PM   #24
Bee C. is offline Bee C.  Indonesia
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Default I'm SORRY.........

Quote:
Originally posted by anatech
Hi Bee C.,
Oui!

That's what I meant. The degeneration resistors may not be required. That is fine tuning. Get it working first and only change one thing at a time (so you know what worked and what didn't).

-Chris
I'm sorry anatech...
I'm on offday last two days....u know ?!
I'm only can make a connection on my workhshop at my office.....


Hee....he.....I'm not as u think.......


Thank for all you have make me up ......... The amp. under construction...I'll tell u if I had done.....soonnnnnnnnn........

btw the scheme be like this one ?!
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Old 3rd August 2007, 07:13 PM   #25
anatech is offline anatech  Canada
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Hi Bee C.,
Q5 and Q6 need to be exchanged, Q7 and Q8 should be exchanged also. They are the wrong polarity for their position. That is to say that MJ15003 and 2SD313 are NPN while MJ15004 and 2SB507 are PNP. They would surely blow if connected the way you have shown.

Use a fixed resistor for RX3. Remember this sets your amplifier's gain along with R6.

-Chris
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Old 3rd August 2007, 09:03 PM   #26
Bee C. is offline Bee C.  Indonesia
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Default Bleww up....

Quote:
Originally posted by anatech
Hi Bee C.,
Q5 and Q6 need to be exchanged, Q7 and Q8 should be exchanged also. They are the wrong polarity for their position. That is to say that MJ15003 and 2SD313 are NPN while MJ15004 and 2SB507 are PNP. They would surely blow if connected the way you have shown.

Use a fixed resistor for RX3. Remember this sets your amplifier's gain along with R6.

-Chris




You too sharp in this..........

thank's againn..again....but I'm on my office so when I come home i'l make it up....
It's good enought to have 100w at 8ohm if I give 30v ?

How exactly I can get current an or the voltage for the driver ? How if the final Tr I use TIP41C/TIP42C ?
Is the R6 as "bosstrap" ?

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Old 3rd August 2007, 09:53 PM   #27
anatech is offline anatech  Canada
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Hi Bee C.,
You need approximately 50 volt supplies to deliver 100 watts into 8 ohms. You would also require two pairs of strong output transistors such as MJ15022 and MJ15023 or MJ21193 and MJ21194 to safely deal with out of phase current and stay winthin the SOA of your outputs. Your drivers needs to be stronger. TIP41C and TIP42C are extremely borderline there, more like MJ15030 and MJ15031 for those. I have not checked your VCE specs on the rest, but they should be rated for at least 120 VDC.

R6 is the resistor that provides your feedback signal, it's a series loss element to drop the voltage along with R3.

-Chris
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Old 5th August 2007, 05:23 AM   #28
Bee C. is offline Bee C.  Indonesia
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Default crawlll....

Quote:
Originally posted by anatech
Hi Bee C.,

R6 is the resistor that provides your feedback signal, it's a series loss element to drop the voltage along with R3.

-Chris
Thanks anatech...
if the R6 is a feedback resistor and can bee losses the voltage...if it's scure to take away the RX3 ?!

Anatech...the MJ15003/15004 is too expensive for mee.... ...he...he.....I'll break my piggy bank for this one....
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Old 5th August 2007, 05:30 AM   #29
anatech is offline anatech  Canada
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Hi Bee C.,
Perhaps you should build for lower power in that case. A blown amplifier is not useful to anyone.

I can say that good quality, matched outputs and driver transistors do reduce distortion. Build within the limits of your circuit and use the best parts you can reasonably afford. That may mean a 50 watt amplifier using the original parts list. It's only 3 dB going to 100 watts, so you will not miss much at all.

-Chris
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Old 5th August 2007, 05:55 AM   #30
Bee C. is offline Bee C.  Indonesia
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Default Greattt....

Quote:
Originally posted by anatech
Hi Bee C.,
Perhaps you should build for lower power in that case. A blown amplifier is not useful to anyone.

I can say that good quality, matched outputs and driver transistors do reduce distortion. Build within the limits of your circuit and use the best parts you can reasonably afford. That may mean a 50 watt amplifier using the original parts list. It's only 3 dB going to 100 watts, so you will not miss much at all.

-Chris

Chris...
if I should say u...

I have an appetite whit BIG Power Amp. but...I have'nt much money to braek my dream come truee...
the only I can do is what like u said.....

btw...I wondering if u have suggest for software what can I use for modeling amplifier/any circuit..for knows the right or wrong whit the circuit assy ?!
is "Eagle" good enought ?
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