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Old 21st May 2013, 01:24 AM   #771
Salas is offline Salas  Greece
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Quote:
Originally Posted by Neville View Post

Output Left -> .237 & right -> .226
If those numbers are in DCVolts on the audio outputs then something's wrong.
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Old 21st May 2013, 02:16 AM   #772
Neville is offline Neville  United States
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The output readings were with multimeter set at 2M. Sorry I should have mentioned this. No pot connected and no inputs wired yet. All LED's light up and relay clicks after few seconds.

Last edited by Neville; 21st May 2013 at 02:33 AM.
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Old 21st May 2013, 02:29 AM   #773
Salas is offline Salas  Greece
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If M is for mV then its OK. What model DMM is it?
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Old 21st May 2013, 07:44 AM   #774
AndrewT is offline AndrewT  Scotland
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Originally Posted by Neville View Post
............Temps on 1st 9240 80F/27C and 2nd 9240 is 85F/30C
Temps on 1st 240 is 87F/34C and 2nd 240 is 82F/24C
Temps are without any sinks on them.

I am curious as to why the 2nd 9240 is hotter than the 1st.
the power required to be dissipated determines the temperature rise.
I*V for each should show similar since all your temps are similar.
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regards Andrew T.

Last edited by AndrewT; 21st May 2013 at 07:47 AM.
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Old 21st May 2013, 12:17 PM   #775
Neville is offline Neville  United States
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Originally Posted by Salas View Post
If M is for mV then its OK. What model DMM is it?
A very cheap Radioshack DMM that has very few scales. Waiting on a new DMM being delivered.

So from what I gather I should have textbook specs based on my readings:

2.12/68 + 2.12/68 = 31.1 + 31.1 = 62.2 mA
&
2.03/68 + 2.03/68 = 29.8 +29.8 = 59.6 mA

I have heatsinks for each mosfet rated at 7.8C/W. What calculation do I use to check how much my current setup is dissipating and also tell me how far I can go in lowering the 68r resistors without having to go to the next step of bolting mosfets to chassis? Be gentle.....

Last edited by Neville; 21st May 2013 at 12:45 PM.
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Old 21st May 2013, 01:01 PM   #776
Neville is offline Neville  United States
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I think Salas already answered my question in post #757 "They don't get that hot with 10R for going CPU sinks. 5C/W for each one would be plenty."
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Old 3rd June 2013, 06:48 PM   #777
Neville is offline Neville  United States
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Wanted to thank all who posted and especially Salas. My Mez sounds good, real good.
Going to move on to a little hotrodding now
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Old 4th June 2013, 12:11 AM   #778
kop89 is offline kop89  United States
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How do I connect the transformer secondaries to the PCB? Let's say I am using an Avel transformer with dual secondaries like pictured here:

Transformers and Power Converters From Avel Lindberg, Inc.

On the PCB, the transformer input are terminals 10, 20 (CT), and 30.

So BLACK goes to terminal 10 on PCB, Yellow goes to terminal 30, then I will tie RED and ORANGE together and connect them to terminal 20 on the PCB? Is this correct?

Thanks
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Old 4th June 2013, 05:03 AM   #779
Salas is offline Salas  Greece
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Quote:
Originally Posted by Neville View Post
Wanted to thank all who posted and especially Salas. My Mez sounds good, real good.
Going to move on to a little hotrodding now
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Old 4th June 2013, 05:09 AM   #780
Salas is offline Salas  Greece
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Quote:
Originally Posted by kop89 View Post
How do I connect the transformer secondaries to the PCB? Let's say I am using an Avel transformer with dual secondaries like pictured here:

Transformers and Power Converters From Avel Lindberg, Inc.

On the PCB, the transformer input are terminals 10, 20 (CT), and 30.

So BLACK goes to terminal 10 on PCB, Yellow goes to terminal 30, then I will tie RED and ORANGE together and connect them to terminal 20 on the PCB? Is this correct?

Thanks
Since you are in the USA you should configure the primaries for 115V as in the link's top schematic.
For the secondaries as in the 2nd from top schematic. Red & orange will go to the center screw of the board connector. You described it correctly.
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