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Thread: Some help with FW F5 boards

  1. #1
    Join Date: Feb 2014

    Location: Surrey

    Posts: 15
    I'm Philip.

    Default Some help with FW F5 boards

    hi - could i please ask an experienced person to look over this diagram to see if the connections are correct? I bought the boards from the Diyaudio + a 500AV, 2x18v transformer. I am puzzled as to where to connect the IEC and the transformer ground? I presume i need to join 2 wires on the transformer to create centre tap. Where would this go ? do i ground this to the chassis?

    Thank you very much in advance for your help

    Philip
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  2. #2
    Join Date: Jan 2020

    Location: South Yorkshire

    Posts: 2,683
    I'm Andre.


  3. #3
    Join Date: Feb 2014

    Location: Surrey

    Posts: 15
    I'm Philip.

    Default

    thank you. Unfortunately, they provide the build with external rectifiers and a 115v transformer. I don't know why considering the rectifier is part of the psu board they sell

  4. #4
    Join Date: Jan 2020

    Location: South Yorkshire

    Posts: 2,683
    I'm Andre.

    Default

    If they did not use Bridge Rectifier Packages they might have considered putting Diodes on the PSU board. I guess its easier to design the PSU Board if they are off..

  5. #5
    Join Date: Feb 2014

    Location: Surrey

    Posts: 15
    I'm Philip.

    Default

    is it not the two black blocks? monolithic bridge rectifier?

  6. #6
    Join Date: Jan 2020

    Location: South Yorkshire

    Posts: 2,683
    I'm Andre.

    Default

    Yes they are Bridge Rectifier Packages with the four legs sticking up..

  7. #7
    Join Date: Mar 2009

    Location: South West-ish, UK

    Posts: 457
    I'm Patrick.

    Default

    Connect the transformer as per the diagram in the 240V box. The secondary connections are as per the 110V box above it. Chassis ground doesn't go anywhere near the transformer: the transformer doesn't have a ground and you should make sure that the bolt through the center of the transformer is only connected to the chassis at one end, otherwise you will create a shorted turn through the transformer (which is not a good idea). I'm assuming it's a toroidal transformer.

    The bridge rectifiers should have two terminals marked AC or ~. It doesn't matter which way around you connect these to the transformer secondaries.

    The +ve output of one bridge will connect to the -ve output of the other to give your 'centre tap' signal ground (the other ends of the bridges will be the positive and negative rails with respect to the signal ground). The signal ground then references to the chassis ground via a thermistor.

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