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Thread: SG8 Pot location

  1. #41
    the conn pads are fine....

    Move the Cap traces at the top down to the bottom, and make the Emitter traces fat and as short as possible like you did to the collector traces....

  2. #42
    Senior Member John_Koorn's Avatar
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    Hi claudio,

    I don't think 2 MOSFETS are enough for that cap bank. I think you'll burn them up pretty quick.

    I'd also avoid a double sided board, especially having the cap traces crossing each other.

    John K.

  3. #43
    Quote Originally Posted by John_Koorn View Post
    Hi claudio,

    I don't think 2 MOSFETS are enough for that cap bank. I think you'll burn them up pretty quick.

    I'd also avoid a double sided board, especially having the cap traces crossing each other.

    John K.
    Hi John, RS_,

    reorganized the PCB, 4 Mofsets on the bottom of the PCB.
    Very difficult to draw all the traces on one side.
    I will better organize the free space but I think the connections are much better now.
    Waiting for more tips..

    thank you
    regards
    claudio

    PCB_PCB-man-4Mofset-invertiti_20180509174519.pdf

  4. #44
    Senior Member Faraday88's Avatar
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    Quote Originally Posted by claudio View Post
    Hi John, RS_,

    reorganized the PCB, 4 Mofsets on the bottom of the PCB.
    Very difficult to draw all the traces on one side.
    I will better organize the free space but I think the connections are much better now.
    Waiting for more tips..

    thank you
    regards
    claudio

    PCB_PCB-man-4Mofset-invertiti_20180509174519.pdf
    Hi,

    Ideally, have the Power section completely isolated from the control section.. remember..we are using Impulse Technology(Transient)..keep EMI/EMC issues at bay you will run into both conducted and radiated emmissions and the Radiant is much more notorious!.. or it will play havoc and or total breakdown of CMOS based ICs..
    Rgds,
    Faraday88.
    'The Magnetic Field is the gatekeeper of the Wheather on the Earth'' - John Bedini.

  5. #45
    Senior Member John_Koorn's Avatar
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    Quote Originally Posted by claudio View Post
    Hi John, RS_,

    reorganized the PCB, 4 Mofsets on the bottom of the PCB.
    Very difficult to draw all the traces on one side.
    I will better organize the free space but I think the connections are much better now.
    Waiting for more tips..

    thank you
    regards
    claudio

    PCB_PCB-man-4Mofset-invertiti_20180509174519.pdf
    Hi claudio,

    It's better, but like RS_ said - BIG FAT traces on the D & S of the MOSFETS, preferably as close to the cap negatives and input/output pads as possible.

    John K.

  6. #46
    Hi,

    Go back to your caps in a sq arrangement with all the
    TOxxxx parts in a row so they fit on a single heat sink like you had it.

    Make fat traces on the bottom on both sides of the Mosfets.

    Arrange the voltage divider resistors to have that connection as close to the Gate as possible, that means using the resistor to jump over a Fat trace, or onto a Fat trace, and keeping all traces on the bottom side....
    Spread out the mosfets, (1in centers) and make that connection trace between the mosfets in a straight line to the gate.
    keep the resistors up off the PCB 1/8in or so when soldering them in

    In general, arrange all components, to keep all traces as short as possible through out the circuit...

    Make sure you have enough room for mounting holes in the corners.
    Last edited by RS_; 05-09-2018 at 09:08 PM.

  7. #47
    Quote Originally Posted by RS_ View Post
    Hi,

    Go back to your caps in a sq arrangement with all the
    TOxxxx parts in a row so they fit on a single heat sink like you had it.

    Make fat traces on the bottom on both sides of the Mosfets.

    Arrange the voltage divider resistors to have that connection as close to the Gate as possible, that means using the resistor to jump over a Fat trace, or onto a Fat trace, and keeping all traces on the bottom side....
    Spread out the mosfets, (1in centers) and make that connection trace between the mosfets in a straight line to the gate.
    keep the resistors up off the PCB 1/8in or so when soldering them in

    In general, arrange all components, to keep all traces as short as possible through out the circuit...

    Make sure you have enough room for mounting holes in the corners.
    Hi RS_, John, Faraday88,

    please just check the Mofset part, PCB is not finished, I would like to know if the traces are better now before reducing the empty space.
    Mofsets distance 1in, maybe too much ?
    Of course will put holes to mount the PCB.
    Will place the POT part on the bottom.
    I do not see how to draw everything on 1 side.
    Is this what you mean to keep traces on the bottom side of the resistors ?

    again thank you all for the help
    regards

    PCB_PCB-man-4Mofset-invertiti_20180510110250.pdf

  8. #48
    That looks better....

    move the TIP41 output trace to very bottom below the fat trace, and the resistors from that trace will jump over the fat trace to the gate

    move the other resistors so that they jump from the top fat trace, next to the Gates and the other resistor pads, and make that pad connection to the gates pad and other resistors pads.....

    move the 7812 over between the TIP42 and the mosfets....

    move the opto to right in front of the TIP42
    Last edited by RS_; 05-10-2018 at 07:42 PM.

  9. #49
    Quote Originally Posted by RS_ View Post
    That looks better....

    move the TIP41 output trace to very bottom below the fat trace, and the resistors from that trace will jump over the fat trace to the gate

    move the other resistors so that they jump from the top fat trace, next to the Gates and the other resistor pads, and make that pad connection to the gates pad and other resistors pads.....

    move the 7812 over between the TIP42 and the mosfets....

    move the opto to right in front of the TIP42
    ...like this ?
    We're getting closer...

    PCB_PCB4Mofinv2_20180511100404.pdf

  10. #50
    Yep, getting closer.....

    Make the resistors pad spacing smaller, and move the top fat trace closer to the Mosfets like the bottom fat trace is.

    move the 2 resistor pair's to right next to their mosfet gates. Adjust where the 2 V resistor divider pads land, to be just to the right of the Gate pads and make a straight connection between the 3 pads on the bottom of the PCB.
    once again move the 7812 to between the TIP42 and the mosfet.

    you might want to rotate that line of TO parts 90deg to be vertical on the right side so you have real short connections from the caps to the mosfets and connectors
    Last edited by RS_; 05-11-2018 at 05:06 PM.

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