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If this is like many switching supplies there is a doubler configuration at the input so you'd expect to see about 300VDC across two series capacitors. Regardless, by applying double the input voltage …

48VDC is the voltage that the POTS (Plain Ordinary Telephone System) works on. It's high enough to allow long thin wires to be used from the CO to the subscriber, and not so high it wastes a lot of en …

You could add a 5V LDO regulator to the 5V circuit. Something like the LD2981, however it will probably appear to work and go into overtemperature protection if a 12V adapter is plugged in and there i …

The commercial unit contains a power supply, software and probably is well designed so that switching inductive loads won't cause the controlling computer to go nuts from time to time. They probably …

It's not really to do with the isolator- but you'd typically use a DC-DC converter with such an isolator, and the capacitor is usually needed to conduct switching noise from the switchmode power suppl …

Since your multimeter reads significantly differently from non-zero with a battery input, your power supply is probably okay. That's a bit of a strange voltage reading- maybe 1/2 wave rectified with D …

The loathsome and dangerous pieces of c**p that you can buy for $1 from China are always going to be cheaper than what you can assemble from safe, reliable parts purchased through distribution chains …

You can compare the approval file numbers with those listed on (say) UL's website. If there is no file number on the device it may be dangerous. If the file number is there, and matches a plausible ma …

Use a linear power supply with a screened power transformer, good filtering, followed by linear low-noise regulators (eg. TI) followed by a bit of RC+ ferrite bead filtering. Or batteries + linear reg …

You need to set the current limit(s) higher. Your power supplies are going into constant-current mode.

Your power supply design is not acceptable. You need filter capacitors from both supplies to ground or the slightest unbalance in loading will cause large amounts of ripple voltage to ground. And you …

You don't need to do anything. Normally 90VDC motors are run by unfiltered power from a phase control type speed controller, operated from 120VAC (or 180VDC from 240VDC). A properly designed driver …

If you have a split-bobbin transformer (primary and secondary on separate segments of the bobbin) you could consider removing the existing secondary and winding a new one. You would probably need some …

It's you. The 1.5uF film capacitor acts as a reactive (lossless) dropping element. D21 shunts negative current away and D22 conducts positive current to the filter capacitor C23 and it is limited by …

You can wire the 240VAC heaters in parallel through an SSR or similar. How you do it is up to you, but a terminal block, spade connectors or even individual connectors (all properly insulated and rate …