1. Baker Steve

    Basic question from one rusty on passives

    I am constructing a filter unit that is intended to allow visualisation (on a scope) and measurement of high-frequency interference on 240v UK mains by means of a high-pass filter to remove the 50 Hz component. What would be the best (and safest) circuit to isolate the unit from the mains while...
  2. manonpajamas

    How can I get 48VAC at 50Hz from mains 220 at 60Hz?

    Hi all, I'm making a custom application and I need a source for a device that takes 300mA - 48VAC at 50 Hz to power. I can easily get the 48V, but how can I get it to 50 Hz? All I've got so far is just trying to rectify it and then using a function generator, but is there another way that wont...
  3. P

    Triac Simulation Question

    Hello all, New to the forum and came here to get some more information about simulating mains voltage Triac circuits. My issue is the following; I have an opto-isolated TRIAC control circuit for a resistive load (water boiler). I know that Triacs generally have a junction voltage drop of ~1-3V...
  4. alfieropson

    Potentially dangerous Mains Power supply

    Hi, I recently had a fault occurring whilst connecting my laptop to my mixing desk whilst having multiple new DMX fixtures connected to a USB interface. Whilst checking for faults I discovered a voltage of about 80-90V between the DMX port on the fixture and the Earth Connector. Knowing that the...
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