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Old 8th October 2013, 05:07 AM   #1
eccdbb is offline eccdbb  United States
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Default wierd rectifier output

I have a problem with my rectifier output. The transformer output is:

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and after rectifying, it becomes:

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I'm using a Avel Y236653 transformer and kbpc2504 rectifier.

I have tested the rectifier with a 9v battery + DMM, and my connections should be correct, so um... what's going on?
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Old 8th October 2013, 05:16 AM   #2
kc8apf is offline kc8apf  United States
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Are you _sure_ you wired it correctly? From KBPC2504 pdf, KBPC2504 description, KBPC2504 datasheets, KBPC2504 view ::: ALLDATASHEET :::, the odd terminal is DC+. DC- is diagonal. AC go across the other diagonal.
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Old 8th October 2013, 05:53 AM   #3
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Are there connection markings on the rectifier case?
Can you check the KBPC2504 with the diode function of your DMM?
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Old 8th October 2013, 05:54 AM   #4
eccdbb is offline eccdbb  United States
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Yea, that's how I wired it.
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Old 8th October 2013, 06:02 AM   #5
brig001 is offline brig001  United Kingdom
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Your scope looks to be AC coupled, and probably a faulty diode in the bridge. What does it do under load?

HTH,
Brian
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Old 8th October 2013, 06:22 AM   #6
eccdbb is offline eccdbb  United States
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I put the DMM in diode mode unconnected, and it says 3.14v. Then:

red | black | reading
AC1|DC+ | .46
DC-|AC2 | .46
AC2|DC+ | .46
DC-|AC1 | .46
DC-|DC+ | .84

All other connections are 3.14.

Looking at the terminal side of the rectifier, if DC+ is on the bottom right corner, AC1 is the top right, and AC2 is the bottom left. DC- is the top left.

What to make of this?
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Old 8th October 2013, 06:25 AM   #7
eccdbb is offline eccdbb  United States
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The scope is DC coupled.

I have it attached to a LM7912 drawing ~70mA. After a couple seconds, the LM7912 output drops to ~5v (I forgot the exact voltage).
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Old 8th October 2013, 06:28 AM   #8
Mooly is offline Mooly  United Kingdom
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Readings look OK on the face of it. All a DVM does on diode range is display the volt drop between the meter probes (3.14 volts open circuited) and when connected to something, the volt drop that passing a small constant current between the probes develops.

As was commented on, add a load and then scope it. Also is there a reservoir cap ?
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Old 8th October 2013, 06:29 AM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by eccdbb View Post
The scope is DC coupled.

I have it attached to a LM7912 drawing ~70mA. After a couple seconds, the LM7912 output drops to ~5v (I forgot the exact voltage).
Post a photo of the set up

Does the reg hot ?
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Old 8th October 2013, 06:29 AM   #10
eccdbb is offline eccdbb  United States
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No capacitors; just scope directly connected to the rectifier.
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