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  • Users: GonzaloEE
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  1. GonzaloEE

    Electric fence line monitor

    Hi all, I'm designing a fence charger with line monitor, and it should monitor the line at all times, no matter if the fence is armed (HV pulses) or not. I've read about some systems injecting control signals between HV pulses, through isolation transformers, though line impedance and noise...
  2. GonzaloEE

    HV xformer for fence energizer

    Hi all, I'm looking for High Voltage transformer suppliers for fence energizers. I mean the standard step-up transformer whose secondary wires are connected to the fence and earth. This is close to what I'm looking for: www.mulehollow.com/retr.html Thanks in advance for any help!
  3. GonzaloEE

    HV Capacitor for fence ctrl.

    Hi all, I'm designing an electric fence controller, and currently working on the HV stage. I'm leaning for a standard appproach with a switch-mode charger for a big HV cap, and a SCR to dump the cap charge in the HV transformer, connected to the fence. I'm looking for a 1200Vdc, 20uF cap for...
  4. GonzaloEE

    I need a DC plug

    Hi all, I'm looking for a hard-to-find DC barrel plug. Their inner tip is made of 2 clamping pins instead of the usual cylinder. What's the commercial name of this plug? Thanks in advance!
  5. GonzaloEE

    Asian SMPS ICs, any opinions?

    Hi all, One of our suppliers in Asia is offering us these Chinese versions of TNY and TOP SMPS switcher ICs. Here's a pic of some samples: [http://files.engineering.com/getfile.aspx?folder=26d6a25e-bab5-41bf-84e2-28b3988fe3e2&file=IMG_2213.JPG] I'm not sure of their reliability, since...
  6. GonzaloEE

    Loads of 15W SMPS blown up: help!

    Hi all, My company sells small 15W flyback SMPS for field appliances and surveillance equipment. One customer claims these PS fail while powering their magnetic doorlocks, even after adding a protection diode in parallel with the output. Now we have dozens of failed PS for warranty repair...
  7. GonzaloEE

    Automated drawing with AutoCAD2007

    Hi all, I need to make 3d views of printed circuit boards made in Protel99SE, for enclosure manufacturing. We have AutoCAD2007 at the office, but its embedded 3D renderer doesn't give any dimensional info. I've made some programs in C to make automated blocks for typical parts like chips...
  8. GonzaloEE

    Flyback fails due to line noise: help!

    Hi, I'm charged to put a flyback SMPS to work with an alarm VHF transceiver for a surveillance system. The PS is an off-line, 40W, 230VAC/14VDC flyback with optocoupler feedback. Due to time constraints, I can't layout a new design but only change components in the current one. The transceiver...
  9. GonzaloEE

    Low EMI with TOP246Y

    Hi. I'm in charge of designing a FCC/IEC compliant flyback SMPS, using the TOP246Y switcher IC. As usual, we have a tight budget and about 5 days to deliver the layout and BOM, so we have no such time for calculations. I'd appreciate any hints on how to use this part to get a flyback with...
  10. GonzaloEE

    Random PWM for SMPS?

    Hi all, I've read some papers on certain ramdom-PWM techniques for SMPS switching drivers (Google 'random PWM'). The authors claim reaching lower noise levels at the output, because - as they say, random switching spreads noise freq. components over a wider band than the standard clocked PWM...
  11. GonzaloEE

    Flyback design question

    Hi all, I've just received this flyback SMPS schematic for a on-field power supply. Please find the link below: http://files.engineering.com/getfile.aspx?folder=b5204258-897d-4bce-879e-1b2efa7b8b6e&file=Flyback1.gif I'd appreciate any help finding any design flaws. Creative suggestions or...
  12. GonzaloEE

    Which CPU to use?

    Hi all, I'm stuck in a project where we need to build a fleet tracking device, based on some embedded processor. Briefly speaking, the device will be attached to the car's dashboard. It will keep a database with a number of geographical points, and it should play an MP3 file if the car passes...
  13. GonzaloEE

    Help on digital video project

    Hi you all, I'm new here. I'm working in a project where I need to convert an analog video signal (PAL or NTSC) to MPEG and JPEG, to either display it in a graphic screen or store files in a SD flash card. This might sound much like those digital cameras, though there's no need for CCD/CMOS...

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