Neumann N452 BV306 rated output voltage
- Thread starter ZHOUJUN
- Start date
Help Support GroupDIY Audio Forum:
C1's rated for 100V; RMS sine voltage before the rectifier will be under 70% of that.
R1's rated for 330mW, and that feeds a 51V Zener diode. The Zener current plus the load current (1mA?), multiplied by the voltage drop across that resistor (C1 voltage minus 51V) should work out to less than 0.3W.
"You do the math" - Ohm's law is your friend
Edit:
How does a transformer like that, meant to supply such a low power, burn out? Unless it was set for 117V AC and fed with 230V AC, through a much overrated fuse...
So you're getting no AC on the output of that transformer, if you disconnect it from the board?
On second thought, if C1 crapped out / went short-circuit internally, that could indeed have toasted the transformer seconday...
R1's rated for 330mW, and that feeds a 51V Zener diode. The Zener current plus the load current (1mA?), multiplied by the voltage drop across that resistor (C1 voltage minus 51V) should work out to less than 0.3W.
"You do the math" - Ohm's law is your friend
Edit:
How does a transformer like that, meant to supply such a low power, burn out? Unless it was set for 117V AC and fed with 230V AC, through a much overrated fuse...
So you're getting no AC on the output of that transformer, if you disconnect it from the board?
On second thought, if C1 crapped out / went short-circuit internally, that could indeed have toasted the transformer seconday...
你的猜测应该是正确的。 应该是电压选择错误造成的。 比如117V误输入220V，我猜电压大概是24-36V左右。 目前变压器接入交流电压后无电压输出。 初级绕组应完全烧毁。 。C1's rated for 100V; RMS sine voltage before the rectifier will be under 70% of that.
R1's rated for 330mW, and that feeds a 51V Zener diode. The Zener current plus the load current (1mA?), multiplied by the voltage drop across that resistor (C1 voltage minus 51V) should work out to less than 0.3W.
"You do the math" - Ohm's law is your friend
Edit:
How does a transformer like that, meant to supply such a low power, burn out? Unless it was set for 117V AC and fed with 230V AC, through a much overrated fuse...
So you're getting no AC on the output of that transformer, if you disconnect it from the board?
On second thought, if C1 crapped out / went short-circuit internally, that could indeed have toasted the transformer seconday...
Your translator only works one way(?).
And it's not like you can't measure the resistance of the primary and/or secondary winding...
Sorry for my poor English, currently the primary and secondary of the transformer are in open circuit state and cannot test its impedance， If I can't get the correct parameters here, I will have to repair the transformer with another one or disassemble the turns of the coil and find Correct answer, Khron, thank you very much for your help.
