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Type: Posts; User: Jester

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  1. Closed: MAINS transfer relat circuit: does this look safe and reliable?

    This is a AC transfer relay circuit that transfers from 120V MAINS to battery backed 120V inverter when the MAINS fail.

    Load is 0.25A
    Relay is EE2-24NU surface mount rated 2A, 240Vac (24Vdc...
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    Closed: Re: Moving from Arduino to actual C

    Software is not my strong point so I'm looking for advice.

    Option 1) On the Microchip website, it appears they offer a free IDE and compiler for the SAM MCU ...
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    Closed: Moving from Arduino to actual C

    I'm working on a project and for proof of concept I used a Cortex M0 based Arduino board (MkrZero) for the micro controller portion. I have some limited experience with C and wrote the firmware using...
  4. Closed: Altium schematic library, I lost the supplier information pane

    Version 13, I'm not sure what I did to break this?

    My component libraries have supplier links to for example Digi-Key and until today, when I selected a component in the SCH Library list, the...
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    Closed: Re: USB differential pair on 2 layer board

    This port is only used for connection to the Arduino IDE for program downloading so 2.0 speed would be more than adequate.
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    Closed: USB differential pair on 2 layer board

    I realize a 2 layer board is less than ideal for this, however that's what were stuck with for this application.

    I'm laying out a board that will make use of an open source Arduino board for the...
  7. Closed: Altium (version 13) can't move cursor left of origin

    This quirk seems to happen once in a while, and I'm not sure what the cause is or how to fix it?

    Board origin is set to 0, 0, while organizing the component placement I can no longer move the...
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    Closed: Re: Core material for current transformers

    Can you explain how you calculated 50VA?

    I’m looking for 1V @ 10Arms to the load.
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    Closed: Re: Core material for current transformers

    I'm going to keep looking for a suitable power transformer, everything I have found so far with high output current capability (10A) is well over 10VA, most of them 150VA, which is too large for the...
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    Closed: Re: Core material for current transformers

    Load is connected at CT output terminals
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    Closed: Re: Core material for current transformers

    I will try a regular power transformer, I should have a 120:24 in my transformer box.

    - - - Updated - - -




    Tha audio amplifier is configured as a current amplifier, amp -> CT ->...
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    Closed: Core material for current transformers

    Magnetics is definitely a weak point for me, I need some help, hopefully someone with expertise can offer some guidance.

    I'm using an audio amplifier configured as a current source for some...
  13. Closed: Re: High Impedance, High Voltage measuring circuit

    All good points, thank you.

    If I build it I will use 15V rails for some headroom for 1kV

    The simple voltage divider is worth a try, eliminates bias and offset errors.

    I think I will layout...
  14. Closed: High Impedance, High Voltage measuring circuit

    I was working on a circuit the other day that measures ac/dc voltage up to 1kV. The input impedance of the circuit is ~2MΩ , so simply connecting any of my DMM's (10MΩ input impedance) loads the...
  15. Closed: Question about Prepreg and high voltage on mid layers

    According to the old 1010.1 standard
    "There are no CLEARANCE or CREEPAGE DISTANCE requirements for the interior of void-free moulded
    parts, including the inner layers of multi-layer printed...
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    Closed: PCB tweak: Pollution degree 2 --> 3

    I have been asked to tweak the design of a control board used in an industrial application for use in the USA. The board was designed to meet PD2 and now they want it to meet pollution degree 3...
  17. Closed: Re: Altium schematic zooms too much when searching

    Does not work, always zooms in so the zoomed component is too close, the setting seems to have no effect.

    I did learn that doing a R-L simultaneous mouse hold enables zooming with mouse movement.
  18. Closed: Altium schematic zooms too much when searching

    I really like using Altium, however the zooming feature just does not work properly for me when searching for example for a text string in the schematic, it always zooms too much. I have played with...
  19. Closed: Re: Power-OFF Transient....... Do you think this will do any long term damage?

    That very thought went through my mind as I repeatedly captured the transient while flipping the switch on the power bar, I was even tempted to try pulling the line cord instead to see if the burst...
  20. Closed: Re: Power-OFF Transient....... Do you think this will do any long term damage?

    Thanks for the quick response. Looks like the ground bounces at the same time. I connected a second probe to ground and then did a A-B capture and it looks much better.
    143535
  21. Closed: Power-OFF Transient....... Do you think this will do any long term damage?

    I'm working on a low current 5.4V power supply based on the LM5008. It works fine on power-up and when running, however on power down there is a fairly nasty looking burst that lasts about 1.5ms (see...
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    Closed: Proximity PCB button layout question

    This will be a 2 layer PCB. Touch surface will be hatched ground except where the two touch pads are. Bottom layer will be used for signal routing and hatched ground plane in all unused areas. All...
  23. Closed: Proximity sensor anyone use MTCH101 or MTCH105

    Hi,

    I need to add two proximity switches (just on and off) to a device, to be implemented as pads on a PCB with solder mask over top (Think common on/off household light switch)

    I can use 2 x...
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    Closed: Re: Adjustable AC load 100W

    More progress, we're getting closer

    With 30nF and 220r, the ZC dropout was 32 degrees, I tried successively smaller capacitors until I reached 1000pF, at this point the ZC distortion is acceptable...
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    Closed: Re: Adjustable AC load 100W

    Klaus,

    With 1k, 15nF the system is stable, however the zero-cross drop out is quite significant, however with a 30nF and lower R, I tried 470r, and 220r the ZC glitches are almost acceptable. I...
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