Bride of Zen problem - Page 3

Kermit · 14th August 2003, 08:04 PM

Quote:

Originally posted by arold19
I need some help please !!!
At the output of the power supply of my Bridge of Zen, I have 60 V, but when I connect it to the circuit, it drop to 28 V.
Can you help me, I don't understand....
I tried it with no cd player and with no amplifier....

Hmm.. sounds like inverted emitter and base. I know cuz I did it

Looking at the tip29 from the front you should have base, collector and emitter, from left to right.
The higher value R2 and R3 shouldn’t result in this. I know cuz I tried that too

till · 14th August 2003, 08:09 PM

ok, ....

.... i thought we made this clear:
http://www.diyaudio.com/forums/showt...303#post219303

arold, did you look at the datasheet and is the tip connected right now?

arold19 · 14th August 2003, 08:22 PM

Thank you !!!
I get off the two resistor and place a wire..... now, I have 60V....
It is OK for the power supply, but I have 60V at the Drain of the mosfet to, it is suppose to be 20 V ....
The 7,5V at the gate is OK...... but how I can have 60 at the Drain ???
thank !!!

till · 14th August 2003, 08:36 PM

ok, you gate ist ok at 7,5V. The drain is at 60V instead of 20V. This means there is no current flow trough the FET and the 1k resistor, because else there would some voltage of these 60V get lost across the resistor (40 of them ). This means a) your Fet is dead because with 7,5 V over the source at the gate there should flow current or b) you wired it not the right way/ check pinout, is there a connection between source and GND.

till · 14th August 2003, 09:46 PM

arold, everything ok?

Elkaid · 14th August 2003, 10:16 PM

You probably have a short-circuit or another component connected backward.

Anorgan · 14th August 2003, 11:17 PM

In thease situations, it is best to google and download all the datasheats for all of the transistors, check everything twice, get some measured numberes from:
http://members.lycos.nl/Aren/id45.htm
and then hook your equipement as it would normaly be operating - the input and the output, and set voltage across R108 to be 2.8 - 4V (what are your values?), and get to the measured voltages. I just did this, and my boz is running OK. It is nice to know that you can make this preamp with only some fluitin, a solder iron, and a multimeter!! Happy DIY-ing.

arold19 · 15th August 2003, 03:24 PM

It is Ok for the circuit now, I forget a resistor.......
but now, I have a serius problem with the power supply, When I get off R2 of the power supply, all was Ok, The 60 V at the output was perfect, but when I get off the resistor of the other channel. the TIP29 broke in fire !!!! I realy don't understand ! Now, I change the TIP 29, this new TIP29 doesn't burn but I don't have 60V at the output, I have nothing.
All the 93 V is in R1. I have nothing in the zener.
Do you know what is happening ???

Kermit · 15th August 2003, 03:40 PM

Quote:

Originally posted by arold19

All the 93 V is in R1. I have nothing in the zener.
Do you know what is happening ???

You mean you have 93v across R1? If that’s what you mean I’m guessing something is shorted or C2 arched.

arold19 · 15th August 2003, 03:46 PM

When I look with my multimeter, the resistance between the base and the ground is 0 ohmm this is normal ??? what mean arched ???

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14th August 2003, 08:09 PM	#22
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	ok, .... .... i thought we made this clear: http://www.diyaudio.com/forums/showt...303#post219303 arold, did you look at the datasheet and is the tip connected right now?

14th August 2003, 08:22 PM	#23
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Thank you !!! I get off the two resistor and place a wire..... now, I have 60V.... It is OK for the power supply, but I have 60V at the Drain of the mosfet to, it is suppose to be 20 V .... The 7,5V at the gate is OK...... but how I can have 60 at the Drain ??? thank !!!

14th August 2003, 08:36 PM	#24
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	ok, you gate ist ok at 7,5V. The drain is at 60V instead of 20V. This means there is no current flow trough the FET and the 1k resistor, because else there would some voltage of these 60V get lost across the resistor (40 of them ). This means a) your Fet is dead because with 7,5 V over the source at the gate there should flow current or b) you wired it not the right way/ check pinout, is there a connection between source and GND.

14th August 2003, 09:46 PM	#25
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	arold, everything ok?

14th August 2003, 10:16 PM	#26
Elkaid diyAudio Member Join Date: Jan 2003 Location: Canada	You probably have a short-circuit or another component connected backward.

14th August 2003, 11:17 PM	#27
Anorgan diyAudio Member Join Date: Jul 2003 Location: Croatia	In thease situations, it is best to google and download all the datasheats for all of the transistors, check everything twice, get some measured numberes from: http://members.lycos.nl/Aren/id45.htm and then hook your equipement as it would normaly be operating - the input and the output, and set voltage across R108 to be 2.8 - 4V (what are your values?), and get to the measured voltages. I just did this, and my boz is running OK. It is nice to know that you can make this preamp with only some fluitin, a solder iron, and a multimeter!! Happy DIY-ing.

15th August 2003, 03:24 PM	#28
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	It is Ok for the circuit now, I forget a resistor....... but now, I have a serius problem with the power supply, When I get off R2 of the power supply, all was Ok, The 60 V at the output was perfect, but when I get off the resistor of the other channel. the TIP29 broke in fire !!!! I realy don't understand ! Now, I change the TIP 29, this new TIP29 doesn't burn but I don't have 60V at the output, I have nothing. All the 93 V is in R1. I have nothing in the zener. Do you know what is happening ???

15th August 2003, 03:46 PM	#30
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	When I look with my multimeter, the resistance between the base and the ground is 0 ohmm this is normal ??? what mean arched ???

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