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Fluctuating VR2 (R2) reading ????
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Audiblesoundwave  
#1 Posted : Thursday, October 7, 2010 8:58:17 PM(UTC)
Audiblesoundwave

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Help!

I am having problem with the BP power module's VR2 (20 ohm) adjustment to .25v and I have already destroyed three VR2. It seems the VR2 is difficult to adjust!

I am using the 200 ohm version (ran out of the 20 ohm version) of the VR2 at the moment; however, the reading is fluctuating (varying from .3 and .214) and not stable at all. The reading would slowly decreasing (to .214) after adjusted to .25v!

I am getting the reading of approx 212 ohm from measuring the VR2’s outer two pins (1 and 3). A reading of approx 212 ohm from pin 1 (right below the adjustment screw) and the middle pin. I don’t think this is right reading.

Could I possibly destroy other components (i.e. Bipolar Power Transistor right next to VR2)? I am running out of solutions due to not having very much of electronic experience!

Thank you for anyone’s input and helps!

Milton
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Russ White  
#2 Posted : Friday, October 8, 2010 8:38:24 AM(UTC)
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What are you measuring?
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Audiblesoundwave  
#3 Posted : Friday, October 8, 2010 9:00:40 AM(UTC)
Audiblesoundwave

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I am measuring R2 for adjusting VR2 to the .25v!

Thanks,
Milton
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Russ White  
#4 Posted : Friday, October 8, 2010 12:22:19 PM(UTC)
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Is it connected to any load?

What is the output voltage set at?
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Audiblesoundwave  
#5 Posted : Friday, October 8, 2010 9:18:59 PM(UTC)
Audiblesoundwave

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No load yet! The voltage is set at 14.99v (close enough to 15v). 7.45 is for each side.

Thanks,
Milton
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Brian Donegan  
#6 Posted : Saturday, October 9, 2010 5:04:41 AM(UTC)
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Audiblesoundwave wrote:
No load yet! The voltage is set at 14.99v (close enough to 15v). 7.45 is for each side.

Thanks,
Milton


I think you may have misunderstood the voltage recommendation. It should be +15V on one side and -15V on the other (each relative to GND). That would be 30V between + and - terminals.
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Audiblesoundwave  
#7 Posted : Saturday, October 9, 2010 6:51:44 AM(UTC)
Audiblesoundwave

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Would this misunderstanding cause the fluctuating result of the VR2 adjustment to .25v?

I will try it again with the correct voltage setting of 15v for each of the + and - sides today!

Thanks again,
Milton
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