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  • schematitics of WTATSON -5A

    From Victor Reijs@21:1/5 to All on Fri Mar 18 03:32:36 2022
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a short circuit it seems it is not regulating well anymore. I see that the circuit board has the text DAIWAN 8270 (and CHING SHENG CS-02V0) on it and I was wondering if one of you has a
    schematic overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor

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  • From Jim Stewart ...@21:1/5 to Jim Stewart ... on Fri Mar 18 16:28:08 2022
    On 18/03/2022 16:17, Jim Stewart ... wrote:
    On 18/03/2022 10:32, Victor Reijs wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a short
    circuit it seems it is not regulating well anymore. I see that the
    circuit board has the text DAIWAN 8270 (and CHING SHENG CS-02V0) on it
    and I was wondering if one of you has a schematic overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor
    bin it   they are rubbish
    had one the laminations buzzed like crazy

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jim Stewart ...@21:1/5 to Victor Reijs on Fri Mar 18 16:17:07 2022
    On 18/03/2022 10:32, Victor Reijs wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a short circuit it seems it is not regulating well anymore. I see that the circuit board has the text DAIWAN 8270 (and CHING SHENG CS-02V0) on it and I was wondering if one of you has a
    schematic overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor
    bin it they are rubbish

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Bernie@21:1/5 to Jim Stewart ... on Fri Mar 18 18:35:50 2022
    On Fri, 18 Mar 2022 16:17:07 +0000
    "Jim Stewart ..." <kinvig.netta@ntlworld.com> wrote:

    On 18/03/2022 10:32, Victor Reijs wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a
    short circuit it seems it is not regulating well anymore. I see
    that the circuit board has the text DAIWAN 8270 (and CHING SHENG
    CS-02V0) on it and I was wondering if one of you has a schematic
    overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor
    bin it they are rubbish

    Not worth the price of a 3055, or whatever, then, Jimothy?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Rambo@21:1/5 to kinvig.netta@ntlworld.com on Fri Mar 18 19:01:18 2022
    On Fri, 18 Mar 2022 16:28:08 +0000, "Jim Stewart ..." <kinvig.netta@ntlworld.com> wrote:

    On 18/03/2022 16:17, Jim Stewart ... wrote:
    On 18/03/2022 10:32, Victor Reijs wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a short
    circuit it seems it is not regulating well anymore. I see that the
    circuit board has the text DAIWAN 8270 (and CHING SHENG CS-02V0) on it
    and I was wondering if one of you has a schematic overview of this board? >>>
    I hope you can help me. THANKS in advance. All the best,

    Victor
    bin it   they are rubbish
    had one the laminations buzzed like crazy

    Nothing mole grips won't cure.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Brian@21:1/5 to Victor Reijs on Fri Mar 18 23:00:59 2022
    Victor Reijs <victor.reijs@gmail.com> wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a short
    circuit it seems it is not regulating well anymore. I see that the
    circuit board has the text DAIWAN 8270 (and CHING SHENG CS-02V0) on it
    and I was wondering if one of you has a schematic overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor


    I’ve never seen a 5A version of the Watson but I believe the others in the range are versions of the same design, obviously with more pass transistors
    and changes to accommodate them.

    I’ve repaired the 25/30A one and the smaller. 10 or perhaps 15 A one and,
    as I recall, they were similar. Certainly the faults were, bad solder
    joints.

    There are links to the circuit of the 30A one here:

    https://www.transmission1.net/viewtopic.php?t=39004

    You may find them useful as a starting point, if nothing else.

    73
    Brian

    G8OSN

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jim Stewart ...@21:1/5 to Bernie on Sun Mar 20 09:12:57 2022
    On 18/03/2022 18:35, Bernie wrote:
    On Fri, 18 Mar 2022 16:17:07 +0000
    "Jim Stewart ..." <kinvig.netta@ntlworld.com> wrote:

    On 18/03/2022 10:32, Victor Reijs wrote:
    Hello all of you,

    Ik bought many years ago a WATSON W-5A power supply and after a
    short circuit it seems it is not regulating well anymore. I see
    that the circuit board has the text DAIWAN 8270 (and CHING SHENG
    CS-02V0) on it and I was wondering if one of you has a schematic
    overview of this board?

    I hope you can help me. THANKS in advance. All the best,

    Victor
    bin it they are rubbish

    Not worth the price of a 3055, or whatever, then, Jimothy?

    no...Watson PSUs are rubbish

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)