I can not believe this! AAAAAAAHHH!

RobPhill33 · 25th January 2003, 10:54 PM

This is so frustrating, I thought I'd share.

I have built the BOZ and got everything working fine. Then I took it apart to wire it nicer. My brother-in-law was coming today and I wanted him to hear it. I worked on it all yesterday and today. Then I tested the circuit tonight when everything was in place and it worked. Then all I did was put the lid on it and hook it up to my system and the fuse blew. By this time my brother in law has shown up, so I pop in one more fuse in and it blows (whats going on!). I then begin to debug it starting at the transformer and I think the tranny is blown. Its a plitron 300VA (30-0-30) and I am getting 45Vrms on one side and 100Vrms on the other (in series). Is this what one would expect from a blown transformer? Thanks

rtirion · 25th January 2003, 11:02 PM

I am really sorry to read that you have met Mr. Demo Devil.

Please check for short circuits just behind the transformer.
Also a blown bridge rectifier could spoil everything.
Check for wiring mistakes.
Take your time, and I am shure you will solve the problem.

Regards

jam · 25th January 2003, 11:04 PM

It is unusual to have a blown secondary in a power transformer. I suspect that you have a wiring error somewhere.

Jam

kristijan-k · 26th January 2003, 12:24 AM

Hello Phill,

You should check rectifier diode bridge, zener diodes and 47.5 R
resistors in the power supply circuit.

Then check all transistors.

Also, check 22.1 R and 100 R resistors in BOZ main circuit.

It is very hard to damage the 300 VA transformer with BOZ.
It could do only damaged diode bridge.
Are you shure about the your voltage readings ?
Make shure to switch the multimeter to AC voltage.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

Nelson Pass · 26th January 2003, 12:33 AM

Did you try it again without the lid?

RobPhill33 · 26th January 2003, 12:33 AM

Thanks for the replies, I will keep trying to solve the prob. Maybe there is hope.

FrankDIY · 26th January 2003, 01:57 AM

The problem is called: Murphy's law

macka · 26th January 2003, 02:04 AM

Leave the Lid off and try again!

Ian

themadhippy · 26th January 2003, 02:05 AM

is that a torrid transformer?if so you may have formed a single secondry winding with the fixing bolt,puting the lid on completed the winding

macka · 26th January 2003, 02:07 AM

High probability mate

Ian

25th January 2003, 10:54 PM	#1
RobPhill33 diyAudio Member Join Date: Sep 2002 Location: Milton Ontario	I can not believe this! AAAAAAAHHH! This is so frustrating, I thought I'd share. I have built the BOZ and got everything working fine. Then I took it apart to wire it nicer. My brother-in-law was coming today and I wanted him to hear it. I worked on it all yesterday and today. Then I tested the circuit tonight when everything was in place and it worked. Then all I did was put the lid on it and hook it up to my system and the fuse blew. By this time my brother in law has shown up, so I pop in one more fuse in and it blows (whats going on!). I then begin to debug it starting at the transformer and I think the tranny is blown. Its a plitron 300VA (30-0-30) and I am getting 45Vrms on one side and 100Vrms on the other (in series). Is this what one would expect from a blown transformer? Thanks

26th January 2003, 01:57 AM	#7
FrankDIY diyAudio Member Join Date: Mar 2001 Location: Quebec City	The problem is called: Murphy's law __________________ Imagination is more important than knowledge. knowledge is limited, imagination encircles the world. Albert Einstein FrankDIY's Audio Corner

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25th January 2003, 11:02 PM	#2
rtirion diyAudio Member Join Date: Nov 2000	I am really sorry to read that you have met Mr. Demo Devil. Please check for short circuits just behind the transformer. Also a blown bridge rectifier could spoil everything. Check for wiring mistakes. Take your time, and I am shure you will solve the problem. Regards

25th January 2003, 11:04 PM	#3
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	It is unusual to have a blown secondary in a power transformer. I suspect that you have a wiring error somewhere. Jam

26th January 2003, 12:24 AM	#4
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	Hello Phill, You should check rectifier diode bridge, zener diodes and 47.5 R resistors in the power supply circuit. Then check all transistors. Also, check 22.1 R and 100 R resistors in BOZ main circuit. It is very hard to damage the 300 VA transformer with BOZ. It could do only damaged diode bridge. Are you shure about the your voltage readings ? Make shure to switch the multimeter to AC voltage. Best regards, Kristijan Kljucaric http://web.vip.hr/pcb-design.vip

26th January 2003, 12:33 AM	#5
Nelson Pass The one and only Join Date: Mar 2001	Did you try it again without the lid?

26th January 2003, 02:04 AM	#8
macka diyAudio Member Join Date: Dec 2001 Location: Australia	Leave the Lid off and try again! Ian

26th January 2003, 02:05 AM	#9
themadhippy diyAudio Member Join Date: Dec 2002 Location: u.k	is that a torrid transformer?if so you may have formed a single secondry winding with the fixing bolt,puting the lid on completed the winding

26th January 2003, 02:07 AM	#10
macka diyAudio Member Join Date: Dec 2001 Location: Australia	High probability mate Ian

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