- #1
kasraian
- 2
- 0
1. Quick question about Full-Wave BRs. If you have a FWBR with unmarked pins, how do you figure out the AC pins and the output DC pins?
How to Determine AC and DC Pins for a Full-Wave Bridge Rectifier?
Click For Summary
Discussion Overview
The discussion revolves around identifying the AC and DC pins of a full-wave bridge rectifier (FWBR) when the pins are unmarked. Participants explore methods for determining the correct pin configuration, including the use of a digital multimeter (DMM) in diode mode and visual inspection of the component.
Discussion Character
- Technical explanation
- Exploratory
Main Points Raised
- One participant inquires about methods to identify AC and DC pins on a FWBR with unmarked pins.
- Another participant asks whether the FWBR consists of two or four diodes, suggesting that the presence of four diodes can be confirmed by a circuit diagram.
- A participant proposes measuring the FWBR pin-to-pin using a DMM in diode mode to draw a schematic and deduce the inputs and outputs.
- It is noted that if the four diodes are visible, a silver strip indicating the cathode can help determine the orientation of the diodes.
- Participants agree that using a diode test with a DMM can provide information about the voltage drop across the diodes, which can help identify the anode and cathode.
- One participant mentions that bridge rectifiers often have a sinewave symbol on the input pins and + and - signs on the output pins, indicating the AC input and DC output, respectively.
Areas of Agreement / Disagreement
Participants generally agree on the methods for identifying the AC and DC pins, particularly the use of a DMM in diode mode and visual inspection. However, there is no consensus on the necessity of seeing the silver strip or the presence of symbols on the rectifier.
Contextual Notes
Some assumptions about the visibility of the diodes and the presence of markings on the rectifier may limit the applicability of the proposed methods. The effectiveness of using a DMM may also depend on the specific characteristics of the rectifier being tested.
- #2
- #3
kasraian
- 2
- 0
4 diodes. I was just thinking about measuring the full-wave bridge rectifier pin to pin using a DMM in diode mode. Then drawing the schematic and concluding the inputs/outputs from their. Is that a good idea?
- #4
Zryn
Gold Member
- 310
- 0
If you can see the 4 diodes, you should notice a silver strip on one side indicating the cathode (negative), and then you can compare their orientation to that picture.
If you can't see this strip, then yes, doing a diode test will tell you. You should either get the voltage drop for the diode (0.6V to 0.7V) when you have the positive lead on the anode (positive) and the negative lead on the cathode (negative), or something like OL (overload) showing a bad result.
If you can't see this strip, then yes, doing a diode test will tell you. You should either get the voltage drop for the diode (0.6V to 0.7V) when you have the positive lead on the anode (positive) and the negative lead on the cathode (negative), or something like OL (overload) showing a bad result.
- #5
vk6kro
Science Advisor
- 4,079
- 41
kasraian said:
Yes, that is an ideal way to do it.
Also, you will often notice that bridge rectifiers have a sinewave symbol on the input pins, and a + sign and a - sign on the output pins. The sinewave refers to the AC input.
If only the + and - signs are present, the other two pins are the input.
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