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diyAudio Member

Join Date: Aug 2003
Location: Gauteng
parallel output stage

Wich parallel output is better? A or B?

I think in B R1 will genarate too much heat!

circuit is still underway!
Comments and Ideas Corrections are Still Welcome!
Attached Images
 output.jpg (22.7 KB, 128 views)
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"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute—and it’s longer than any hour. That’s relativity." - Albert E

 27th August 2003, 07:13 AM #22 diyAudio Member   Join Date: Apr 2003 Location: Százhalombatta, Hungary The "B" version is the only good solution. Sajti
 27th August 2003, 07:16 AM #23 diyAudio Member   Join Date: Apr 2003 Location: Százhalombatta, Hungary And You can reduce the R1 to 0.1ohm. Due the local feedback inside the CFB the value of this resistor is not really critical. I found that some small resistors (say 1-2ohms) series with the base of the output trannies help to avoid oscillation. Sajti
diyAudio Member

Join Date: Jun 2001
Location: Flanders, Belgium
R3 en R12 must be the same value! (the whole schematic)

Quote:
 hugobross how did you calculate the output power?
it's quite easy:

Uv = supply (rail) voltage
Zl = load impedance (4 ohm, 8 ohm, ...)
Prms = continuous power

Prms = (Uv x Uv) / (Zl x 2)

actually Prms will be a little smaller, because there will always be a Uce across the transistors

best regards,

HB.

diyAudio Member

Join Date: Aug 2003
Location: Gauteng
Quote:
 R3 en R12 must be the same value! (the whole schematic)
hugobross So you mean they must be both 22K
or must they be both 27K
__________________
"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute—and it’s longer than any hour. That’s relativity." - Albert E

 27th August 2003, 04:57 PM #26 diyAudio Member     Join Date: Jul 2003 Location: Israel , haifa try also triple putput stage , its the best one but hard to stabilize
 27th August 2003, 04:59 PM #27 diyAudio Member   Join Date: Jun 2001 Location: Flanders, Belgium with 27k the gain is 27x and with 22K it's 22x, but the most important thing is that both resistors have the same value (otherwise the LTP is not balanced well). gain = R3/R2 You can also place resistors of 47ohm (more or less) in series with the emitters of Q1 and Q2 to reduce small differences between both transistors. best regards, HB

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