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Old 25th June 2009, 06:46 PM   #61
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Quote:
Originally posted by gaborbela
I can find BDW93C/94C which is equivalent to the bigger brother BDW83C /84C but with less power .Still it would be enough with 40V rail voltage , and I plan to use 2pair of course .
Unfortunately the driver BF469 /BF470 hard to find parts , also with BC414C /416C have the same issue .
BDW83C/84C are still available here. A few weeks ago they were still offering them from STM as well, but now they only have the unspecified brand version left.
BF469/470 is also available from a different manufacturer at that place.
Replacements for BC414C/416C are BC550/560, if I remember correctly.
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Old 25th June 2009, 08:18 PM   #62
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Hello
Thank you very much for the information .
I will order from Reichel .
Also today I ordered from Mouser BDW93C/94C produced by ST company . Those are good quality transistors .I did a lot of test before with different type of transistors . ST is the best for me .
Yes I plan to use BC550C/560C to replace the orig BC signal transistors .
Thanks one more time .
Greets
I post the lay out but if you want to use it you have to figure out the parts were they go .
I made the layout with out any software .
Greets
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Old 25th June 2009, 08:25 PM   #63
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I will post it one more time , may be it would be better .
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Old 26th June 2009, 05:13 AM   #64
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Quote:
Originally posted by gaborbela
I will order from Reichel .
Watch out. There is a minimum order of 150 for deliveries abroad. If Reichelt still sells those transistors, they must be available at other places as well.
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Old 26th June 2009, 02:20 PM   #65
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Thanks for the information
That is a very big problem , I'm looking for these transistors about two month now .I don't find no where .Even if I found some country the BDW84 is in TO247 case another is TO218 and no BF at all .
Finally I have a sours but to spend 150 Euro instead 10-15Euro that will be a big problem .I cant do that , and there is no good replacement for the BF drivers .I did tested a lot of different transistors .
I have no need to buy any other items .To spend 150 Euro on these transistors that is crazy .
I must fund someone in Germany to do these order to me .
I send the money in that case ahead .
I'm very upset now .
That is my luck .
Thanks for the info any way
Greets
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Old 26th June 2009, 03:08 PM   #66
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did we see a schematic of this amplifier ????

if not i will be very happy to see it

thanks
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Old 26th June 2009, 03:13 PM   #67
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Hello
The schematic is at the first post .
There is a mistake , the input resister 2.2k not 2.2R
And you can use at the input up to 4.7uF capacitor .
Regards
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Old 26th June 2009, 03:27 PM   #68
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Default as far

as i can understand there is 4 output transistors in the pcb ... did you check if this is working properly and has no oscilation and so on ????

cause if you dont then you are the first one that parallel 4 output transitors of this type

the other one who did it was the nelson pass with the A40 boards ....

keep us posted about the progres

thank you
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Old 26th June 2009, 03:41 PM   #69
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Hello
Yes I did and works better than only one pair .
Better bass , fuller mid range .More control over the speakers
It works much better , the designer told me to use 2 pair instead one pair .
I used over 50V power supply , I had that transformer in hand and it was a bit to much for 1pair darlingtons .
After I used two pairs and it sounded much better , no problem at all .
Greets
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Old 26th June 2009, 03:45 PM   #70
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Default can we have

scope readings of this device ????

tip142-147 are famous for instability

also a complete new schematic will be also usefull ////

i wonder what resisitnce you have in the out of every transistor ???? NP used 0.68 per device

then again 50 volts rails ( dc i presume ) will produce easily 120w so there is a question of soa , thermal stability . and generaly iv never seen that before and if it works it will be very fine to see the complete thing ....

120w @8R ...and then how much in 4 ???? or 4 ohms is a total NO GO ????

seen similar application before but VI limiters for base limiting was a must

i trully hope that really works very fine but since i ve never seen that before i am a bit scpetic about it

regards sakis
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