aleph 5 - Page 3

intense-tavda · 18th August 2005, 09:18 PM

hello!
Now I get -38,4V and +36,6V left and right +36,5V and -38,1V
Its getting closer! But it did not give me an answer!
Teake.

harryeng · 18th August 2005, 09:22 PM

Teake,

Where did you exactly measure?

Harry

intense-tavda · 18th August 2005, 11:53 PM

Hi Harry
I measured on one monochannel on the + of the elco to gnd, and from - to gnd, I did the same with the other channel. I measured with an multimeter on 200DC. Teake

harryeng · 19th August 2005, 05:55 AM

Hi Teake,

How did you connect ground to zero?
I would disconnect the Elco (at least the plus side) and do the measurements I described. It can be one of the diodes in the rectifier is blown. That has happened to me.

Greetings, Harry

intense-tavda · 19th August 2005, 09:10 AM

I connected ground to zero to floating point gnd and now it looks that I'm getting the same figures. It looks like its getting stable now. I'm getting now from one channel +and- 37,1V and from the other 37,2V. For several ours. Thanks Harry.
ps But mayby the rectifiers er broken because I made some shortening in the beginning. I guy in the local elektronics shop told me that that doesn't matter. But you never know! I will measure that.

intense-tavda · 19th August 2005, 09:46 AM

He Harry I measured the rectifiers + and - to GND and measured the same voltages 24,2V on both rectifiers the same, so I don"t think they are wrong. The PSU looks stable now, so I will connect the pcb's and see what,s happening, and measure that.
Greetings teake.

intense-tavda · 20th August 2005, 07:03 PM

Hi there!
I mounted the pcb's to the psu, there are only 3 of them getting hot. I figured out that I had to put a 221K instead of a 221R on R17 on Cristijan's PCB. When I did that and connected te pcb's there was some smoke coming from one mosfet. At that moment I did not have connected the mosfets to the heatsinks, i turned the power down and cennected them to the heatsinks and put them on the psu again, but only three are getting hot, so what's happening here? Distroyed the mosfets? How can I measure that. Thanks Teake.

Netlist · 20th August 2005, 07:23 PM

A smoking mosfet? Just take it out and put a new one in.
In case you don't have a variac try adding a lightbulb (60-100W) in series with the mains wire to prevent high current running through the amp. Turn the bias pots down as well for the time being. I'm in a hurry and will provide a decent link to test transistors when I get back.

/Hugo

intense-tavda · 20th August 2005, 08:27 PM

Uh, now my 3 mosfets who went hot also cooled down and there is no temperture anymore. On the speaker terminals i got 28 and 24 V so what's going on! I am thinking of letting the projekt down, or will let the job done by a professional. But I'm not that kind of guy, I want to win! And listen! Music man, that's my life!

Netlist · 20th August 2005, 08:59 PM

Quote:

Originally posted by intense-tavda
I want to win! And listen!

Here's a good site to learn all sorts of basic things. Look under #97, Output transistor failure to learn how to test transistors.

/Hugo

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18th August 2005, 09:18 PM	#21
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	hello! Now I get -38,4V and +36,6V left and right +36,5V and -38,1V Its getting closer! But it did not give me an answer! Teake.

18th August 2005, 09:22 PM	#22
harryeng diyAudio Member Join Date: Dec 2004 Location: Roosendaal	Teake, Where did you exactly measure? Harry

18th August 2005, 11:53 PM	#23
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	Hi Harry I measured on one monochannel on the + of the elco to gnd, and from - to gnd, I did the same with the other channel. I measured with an multimeter on 200DC. Teake

19th August 2005, 05:55 AM	#24
harryeng diyAudio Member Join Date: Dec 2004 Location: Roosendaal	Hi Teake, How did you connect ground to zero? I would disconnect the Elco (at least the plus side) and do the measurements I described. It can be one of the diodes in the rectifier is blown. That has happened to me. Greetings, Harry

19th August 2005, 09:10 AM	#25
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	I connected ground to zero to floating point gnd and now it looks that I'm getting the same figures. It looks like its getting stable now. I'm getting now from one channel +and- 37,1V and from the other 37,2V. For several ours. Thanks Harry. ps But mayby the rectifiers er broken because I made some shortening in the beginning. I guy in the local elektronics shop told me that that doesn't matter. But you never know! I will measure that.

19th August 2005, 09:46 AM	#26
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	He Harry I measured the rectifiers + and - to GND and measured the same voltages 24,2V on both rectifiers the same, so I don"t think they are wrong. The PSU looks stable now, so I will connect the pcb's and see what,s happening, and measure that. Greetings teake.

20th August 2005, 07:03 PM	#27
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	Hi there! I mounted the pcb's to the psu, there are only 3 of them getting hot. I figured out that I had to put a 221K instead of a 221R on R17 on Cristijan's PCB. When I did that and connected te pcb's there was some smoke coming from one mosfet. At that moment I did not have connected the mosfets to the heatsinks, i turned the power down and cennected them to the heatsinks and put them on the psu again, but only three are getting hot, so what's happening here? Distroyed the mosfets? How can I measure that. Thanks Teake.

20th August 2005, 07:23 PM	#28
Netlist diyAudio Moderator Join Date: Jan 2003	A smoking mosfet? Just take it out and put a new one in. In case you don't have a variac try adding a lightbulb (60-100W) in series with the mains wire to prevent high current running through the amp. Turn the bias pots down as well for the time being. I'm in a hurry and will provide a decent link to test transistors when I get back. /Hugo

20th August 2005, 08:27 PM	#29
intense-tavda diyAudio Member Join Date: Jun 2005 Location: drachten	Uh, now my 3 mosfets who went hot also cooled down and there is no temperture anymore. On the speaker terminals i got 28 and 24 V so what's going on! I am thinking of letting the projekt down, or will let the job done by a professional. But I'm not that kind of guy, I want to win! And listen! Music man, that's my life!

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