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  1. EEMan1972

    Power Supply Not complying with the new DOE Level VI Performance Requirements

    I'm working on a VERY custom 120VAC to 5VDC power supply and I've looked over the new DOE efficiency standards and I've noticed that they have changed the Max power in the No Load mode to 100mW for my power output. Given the complex design of the power supply I do not think that I can meet this...
  2. EEMan1972

    SMT Solder Pads Below Surface of Solder Mask?

    I'm wondering if it is possible to have a SMT solder pad sit below the surface of the solder mask. In other words, if you were to take your finger and run it along the solder pad you would catch the edge of the solder mask because it is sitting higher than the pad. Has anyone tried this or do...
  3. EEMan1972

    Calculating Flyback Transformer Core Air Gap

    Hello, I'm working on designing a very custom flyback transformer and I'm needing to have the two EE core halves machined and ground to size from solid ferrite. The last step I need is to calculate the air gap between the central core leg but I haven't found a good reference in text or online...

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