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Old 30th January 2010, 07:18 AM   #1281
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by cjkpkg View Post
I went with 3.3K bleeders for R1 and R2...tonight I hooked up the PSU to my xformer on the test bench in the C-C-C setup. It is a 200VA 12VAC toroid. I measured 17.2VDC on the PSU outputs.

I have placed an order for 10 .47ohm 3W resistors with some other misc stuff I needed...The voltage drop obviously will be negligible.

My HiFi2000 chassis shipped today so it should arrive in the next week or 2...cant wait to get it all assembled.
You will like the crc
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Old 30th January 2010, 03:11 PM   #1282
udailey is offline udailey  United States
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HiFi2000..... You lucky dog!
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Old 30th January 2010, 06:01 PM   #1283
jleaman is offline jleaman  Belgium
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Originally Posted by udailey View Post
HiFi2000..... You lucky dog!
Order one then

As soon as i start making a little bit of $$ ill be ordering 2
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Old 30th January 2010, 09:49 PM   #1284
cjkpkg is offline cjkpkg  United States
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OK...I hooked everything up for a quick bench test...no inputs...

On both boards, only one of the mosfets(Q6) have voltage? normal?

Also, even the ones that have voltage are not warm at all...mounted temporarily on a sheet of aluminum...

Can someone give some guidance as to what voltages ought to be at particular critical points? I could probably stumble through but I'm sure someone has been here before...

Thanks in advance...
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Old 30th January 2010, 09:57 PM   #1285
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by cjkpkg View Post
OK...I hooked everything up for a quick bench test...no inputs...

On both boards, only one of the mosfets(Q6) have voltage? normal?

Also, even the ones that have voltage are not warm at all...mounted temporarily on a sheet of aluminum...

Can someone give some guidance as to what voltages ought to be at particular critical points? I could probably stumble through but I'm sure someone has been here before...

Thanks in advance...
can you post pictures ?

Do you have all 3 power wires connected ? Positive negitive and gnd ?

jase
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Old 31st January 2010, 07:53 PM   #1286
cjkpkg is offline cjkpkg  United States
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Yes...all power and earth ground connected from the wall to PSU board and to ch ground on the amp board.

Here are some voltage observations...
Q1: 9.2 -17.3 3.2
Q2: 0 -15.6 3.2
Q3: 13.2 3.2 16.35

Q4: -17.3 -17.3 -15.59
Q5: 17.1 17.2 17.2

Q6: -17.3 17.1 -15.6
Q7: 17.2 17.3 17.1

I hooked up an input and a small test speaker and there is no sound coming out...

I also took readings at all resistor terminals so I have those if it helps...

Carl
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Old 31st January 2010, 09:36 PM   #1287
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I dont think your source resistors are working,

What is the voltage across both sides of the resistors on Q6 and Q7, or r27 and r28.
So put volmeter positive on one side of the resistor, the other on the other side.
Should be ~.5v or 500mv.
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Old 31st January 2010, 09:41 PM   #1288
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by cjkpkg View Post
Yes...all power and earth ground connected from the wall to PSU board and to ch ground on the amp board.

Here are some voltage observations...
Q1: 9.2 -17.3 3.2
Q2: 0 -15.6 3.2
Q3: 13.2 3.2 16.35

Q4: -17.3 -17.3 -15.59
Q5: 17.1 17.2 17.2

Q6: -17.3 17.1 -15.6
Q7: 17.2 17.3 17.1

I hooked up an input and a small test speaker and there is no sound coming out...

I also took readings at all resistor terminals so I have those if it helps...

Carl

Post pictures ? Don't forget to short the input side of the balanced to gnd.
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Old 1st February 2010, 12:47 PM   #1289
cjkpkg is offline cjkpkg  United States
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R27: 17.29 / 17.29
R28: 17.06 / 17.06

I'll post pics later today...couldn't find my camera until late last night...
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Old 1st February 2010, 01:12 PM   #1290
cjkpkg is offline cjkpkg  United States
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***insert facepalm***

R13 - I ordered 47.5 ohm instead of 47.5k ohm...rookie...

who knows what else I fried as a result...
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