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Burnt Board -- WWYD?

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  • #16
    Sorry, I should clarify, that's a schematic off the internet not something I drew, I'm guessing the functioning section is not wired like that (I literally cannot see well enough in all that mess to see how on earth its making connections.

    Also, I didn't scope it for ripple / noise or load it to see if it caves, I just meant that the Simpson meter said it was putting out +/- 18VDC as I think it should based on the zeners (4746).

    I apologize for not being clear.

    Thanks!
    Well, you know what they say: "One man's mojo is another man's mojo".

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    • #17
      Originally posted by tbonuss View Post
      So, I went to just rebuild the section on perfboard...this is wrong, right? Maybe I'm just confused...
      Yes, that drawing is wrong. It's at least missing a connection between the (circled) diode and the 820ohm in the LV minus side. Compare to schematic attached.
      Attached Files
      Originally posted by Enzo
      I have a sign in my shop that says, "Never think up reasons not to check something."


      ​
      • Likes 2

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      • #18
        Fiberglass Pen.....I hadn't seen this before, but found it here: https://www.amazon.com/dp/B07M94Y12J...NsaWNrPXRydWU=

        I bought the set, which bypassed the $10 shpg fee. Thanks for the tip!

        Click image for larger version Name: Fiberglass pen + others.jpeg Views: 200 Size: 14.9 KB ID: 917945
        Attached Files
        Logic is an organized way of going wrong with confidence

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        • #19
          G1--thank you--haha, I didn't even notice it was totally missing that leg-I was distracted by the diode-cap alignment. Looking at that schematic you posted, I think I can see why people might have the caps reversed. Reading the polarity on the caps is nigh on impossible. On the schematic chunk I posted, aren't the caps (or the diodes, I guess) in backwards?
          Well, you know what they say: "One man's mojo is another man's mojo".
          • Likes 2

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          • #20
            Originally posted by tbonuss View Post
            G1--thank you--haha, I didn't even notice it was totally missing that leg-I was distracted by the diode-cap alignment. Looking at that schematic you posted, I think I can see why people might have the caps reversed. Reading the polarity on the caps is nigh on impossible. On the schematic chunk I posted, aren't the caps (or the diodes, I guess) in backwards?
            Oh yeah. I missed those too. LV supply caps are wrong polarity shown (bias and HV caps seem correct).
            Originally posted by Enzo
            I have a sign in my shop that says, "Never think up reasons not to check something."


            ​
            • Likes 1

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            • #21
              Hello again fine folks of tMEF! After a brief forray into my real world responsibilties I'm back here at it--armed with a high quality solder station, and a head full of bad ideas ...I made this.

              I'm fairly almost 42% sure that its at least partially right. All available schematics suck.
              1 Photo
              Well, you know what they say: "One man's mojo is another man's mojo".

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