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  • Users: djroseman
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  1. djroseman

    Rotating or static torque sensor

    Hello, I am specifying a sensor for measuring torque on an electric motor system, and have come across both static (reaction) sensors and rotational sensors which spin with the shaft. What would be the relative advantages of choosing one type of sensor over another ? My application has max...
  2. djroseman

    Current sense signal lags current on PWM controller

    Hi, I am using a UC2842 PWM chip to control a boost converter, boosting to 120Vdc with a 70Vdc input. The issue is that the Isense input to the PWM chip (no slope compensation fitted) seems to lag the current through the Inductor and sense resistor (0.01R fitted in -ve line)- the two opamp...
  3. djroseman

    looking for linear regulator with remote sense

    Hi, I am looking for a linear regulator with up to 15V input able to deliver 3A of current with remote sense functionality. Sounds easy, but I need remote sense in both positive and negative lines in a similar way to the way Vicor do on their Maxi and Mini modules. Any ideas, as the normal...
  4. djroseman

    RS485 communications interface with PIC

    Hi all, First off, if this is in the wrong place, then please let me know. I am very new to PIC programming, but I do know a little about writing embedded software in C and assembler. I have been asked to design an interface to send status information over an RS485 link for a power supply...
  5. djroseman

    Protect the status of "Engineer" in the UK

    Hi, A petition has been set up on the 10 Downing Street website to protect the status of Engineer in the UK. Today, car mechanics, plumbers and electricians are know known as “engineers” which is seriously eroding the status of our profession. If you are a UK professional engineer, then...
  6. djroseman

    Circuit Protection on an automotive electronics application

    Hi, I have a requirement to make a protection unit to prevent damage to our telematics system from large voltage and current spikes, both from the vehicle and attempted sabotage by operators. The normal operating voltage is 24V, but it is possible to have up to 80V or more spikes. My current...
  7. djroseman

    SMT footprint information

    Hi, I am doing some PCB design, and I have found that the information on the dimensions of various SMT footprints is quite lacking on the Web. Is there a source somewhere of footprint drawings with dimensions of the pads + spacings, so that I can design them in my CAD package? Thanks Dave
  8. djroseman

    Protel PCB ASCII file structure

    Hi, I have an ASCII file generated from a Protel PCB design, which I am trying to get through an In Circuit Test procedure, and I need to decode what the data in the file denotes, specifically the layer information for test pads. A snippet of the file is shown below: COMP TP523 PINNE PINNE...
  9. djroseman

    Power electronics resources

    Hi, I have recently come across fromt the RF Engineering field into digital electronics, and I need to look into power supply design for a project. Can anyone point me towards any useful resources on the internet showing theory, example circuits etc. Thanks Dave Roseman
  10. djroseman

    Looking for UMTS modem

    Hi, I am looking to source a modem to convert 3G (UMTS/WCDMA) signals into RS232 signals to pass into an ATMega128 microcontroller as part of the telematics solution we are developing. Does anyone know any good suppliers of these devices ? Thanks Dave Roseman

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