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Old 29th March 2011, 01:48 PM   #1421
viki_v2 is offline viki_v2  India
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Quote:
Originally Posted by AndrewT View Post
I think you mean 33E = 33r = 33ohm resistor.
If that is the case, then E33=0r33 = zero point three three ohm resistor.

Do not drop the leading zero. It is important to accurate transfer of information.
O O I messed up, will change to or33 and post
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Old 29th March 2011, 02:06 PM   #1422
AndrewT is offline AndrewT  Scotland
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0r33 not or33
Zero point three three.
That Zero is important. do not call it o nor O get used to Zero, that is quite different.

Notice I did not say Zero point thirty three. never join the digits after the decimal point. Always read them out separately. Only the digits before the decimal point are allowed to joined. 124 becomes one hundred and twenty four, but 0.33 never becomes: point thirty three.
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Last edited by AndrewT; 29th March 2011 at 02:08 PM.
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Old 29th March 2011, 05:10 PM   #1423
viki_v2 is offline viki_v2  India
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Originally Posted by viki_v2 View Post
O O I messed up, will change to or33 and post
i changed the resistors to 0.33 still no sound. no activity at out.
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Old 30th March 2011, 06:10 AM   #1424
mj777 is online now mj777  Philippines
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Default please help, anyone? r20 and r21 getting burned

Sir Apex, I have a problem with this B500, as soon as I switch on the circuit, the 100R resistor (R20,R21) is getting burned:
this are the specs of the circuit taken from the forum and schematics:
psu: +/- 68Vdc
transistors: 1943&5200, mje340/350,2n5401,2n5551, zeners 15Volts 1 watt, R24/25 2.2K 2watts. I attached some pictures for everyone to give me some advice, tanx in advance for any help u can give.nsl32 replace by red LED and 47K resistor.

Regards,
mj777

DSC03127.JPG

DSC03128.JPG

DSC03129.JPG

DSC03130.JPG

DSC03131.JPG

DSC03132.JPG
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Old 30th March 2011, 08:38 AM   #1425
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Default fake transistors

hi mj777
greetings i had the same problem CHECK PIN COONNECTIONS OF
2N5401 2N5551 lots of fake transistors around same make BASE PIN was at side
not middle in some base pin was in centre both transistors had these 2n5401 2n5551 HOPE this helps you out
thanking you
andrew lebon
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Old 30th March 2011, 08:54 AM   #1426
mj777 is online now mj777  Philippines
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thanks andrewlebon i will try to check those transistors.

regards,
mj777
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Old 30th March 2011, 01:19 PM   #1427
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Default ldr and led

hi mjm777
greetings why you dont use ldr and led combination instead of nsl32
easy and cheap to make
thanking you
andrew lebon
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Old 30th March 2011, 06:46 PM   #1428
viki_v2 is offline viki_v2  India
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Quote:
Originally Posted by AndrewT View Post
0r33 not or33
Zero point three three.
That Zero is important. do not call it o nor O get used to Zero, that is quite different.

Notice I did not say Zero point thirty three. never join the digits after the decimal point. Always read them out separately. Only the digits before the decimal point are allowed to joined. 124 becomes one hundred and twenty four, but 0.33 never becomes: point thirty three.
Sorry but if it isnt zero. thirty three, what will it be.
i purchased . thirty three ohm resistor for b500.
please guide.
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Old 30th March 2011, 08:34 PM   #1429
mj777 is online now mj777  Philippines
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dear andrewlebon,
i have tried to check the transistors and all seems to be working fine, to verify that it is working(the transistors) I fixed it on my other diy amp the dx blame mk2 prototype and it is working fine. so i think the problem is not in the transistors, any other ideas u can share? and in ur nsl 32 replacement what is the resistance value of the ldr u use?
regards,

mj777
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Old 31st March 2011, 10:04 AM   #1430
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Quote:
Originally Posted by mj777 View Post
dear andrewlebon,
i have tried to check the transistors and all seems to be working fine, to verify that it is working(the transistors) I fixed it on my other diy amp the dx blame mk2 prototype and it is working fine. so i think the problem is not in the transistors, any other ideas u can share? and in ur nsl 32 replacement what is the resistance value of the ldr u use?
regards,

mj777
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Last edited by jalou1995; 31st March 2011 at 10:08 AM.
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