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    Re: Types of resistors and capacitors

    I have 10 of those 60-drawer cabinets, Resistors, capacitors, LEDs, analogue ICs, Digital ICs, Transistors (inc FETs etc), inductors, hardware etc etc etc. Plus three larger cabinets for other...
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    Re: Types of resistors and capacitors

    :biggrin: at a storage drawer per possible value? Or just a drawer per value you HAVE? Could be an AWFUL lot of drawers!!!!
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    Re: Memory Required for GPS interfacing

    To do what? If all you want to do is record the data then only a few bytes. If, however, you want to build a Plotter based on the information then considerably more!
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    Re: Mounting LEDs ideas?

    You can purchase LED spacers that are (effectively) x-shaped bottom parts with a flat disc on the top having two holes for the leads. The 'x' part is closest to the PCB/track but gives access to the...
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    Re: Metal Detector

    The single most important part of any metal detector is the coil assembly. A PIC is usally only used to make 'fancy' displays of the resultant signal but you can't make a silk purse from a sows ear...
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    Re: Computer Display?

    Parallel a 0.1uF capacitor across the 47uF. Whilst the 10k pot to derive the 3V supply is very crude you show no decoupling of the 5V supply itself or the attached ICs - all of which are required.
    ...
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    Re: Comparator question

    Providing the reference and measured voltages have a COMMON return (negative) it doesn't matter what you use for the voltages.
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    Re: PIC Input Vs Cable Length

    Use twisted pair cable. Capacitive filters and (possibly) inductors - you can get three-terminal C-L-C filter components - would be acceptable. False triggering could be catered for in programming...
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    Re: Switching between power source and battery

    :D I sympathise with the 'excuse' :p but the first two resons don't parse..... a simple capacitor will prevent the volt drop for the millisecond(s) the relay switches and relay contact reliability is...
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    Re: Switching between power source and battery

    If the device is primarily mains-powered there is no real concern for power consumption and a simple RELAY would allow switching of practically any amperage at the cost of a few 10's of mA.
    ...
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    Re: Saw my Design in a Commercial Product

    Count yourself lucky - I designed/built a 'walkman' type cassette player TWO YEARS before they became mainstream........
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    Re: Underwater speed?

    How about doppler? Modern speed instruments (for deep sea vessels where you can't get an echo back from the bottom) use doppler (iirc at around 2MHz) - you reflect off the bottom. It might work...
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    Re: Underwater speed?

    Have you considered the effect of tides/water movement?

    One method in use is to generate a magnetic field then measure the voltage induced into a pair of sensors by the water flowing through the...
  14. Re: How to display the real frequency for an AD9850

    If you are using keyboard input for frequency selection just port the keypresses directly to the display at the same time you use it in the calculation for register coding.
  15. Re: How to display the real frequency for an AD9850

    The counter content IS the frequency - unlesss the device is defective! Whilst you could use a PIC as a frequency counter you're just adding unnecessary complication and, possible accuracy errors. ...
  16. Re: can any one say reviever name which gives same output as rockwell tu00-d200-401

    AFAIK all GPS modules give out a NMEA (serial) signal - unless there is a particular NEMA sentence you can get from the Rockwell one that others don't generally support(?), practically ANY GPS module...
  17. Re: Help Identify this Display board and/or need pinouts/datasheet

    Finding the pinout would only be the start of your problems - it appears to be controlled serially by the 89C51 processor. Not too many of those pins appear to be connected so determining the serial...
  18. Re: Anyone know of source for low cost VGA displays to go under these?

    VGA refers to the resolution, not the interface. That screen IS of VGA resolution - if you are after a display with the standard 15pin hi-d analogue VGA display driver built-in then you're pretty...
  19. Re: Anyone know of source for low cost VGA displays to go under these?

    How about using a display WITH a touch-screen such as this VGA example replacement screen/digitizer for the Dell Axim X51V
    ...
  20. Re: help with 74hc595 2 ic cascaded drive 16 relay

    eh? When you are programming the output port you are writing a bit-pattern to it (8 bits = 1 word, usually a hex value but could be straight binary or even decimal depending on the method you...
  21. Re: help with 74hc595 2 ic cascaded drive 16 relay

    OR the existing port register with the bit pattern of the ports you want to change.

    i.e existing port state 01001010
    required port state 11001010

    OR-ing them results 11001010

    note...
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    Re: Question about mechanical relay

    Go with an opto-isolated triac then.
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    Re: Question about mechanical relay

    Absolutely not - you should not use relay contacts in parallel under any circumstances. Look at getting a small automotive 12V coil relay or even consider using MOSFET(s) for the switching component.
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    Re: Inverter question

    Connecting to a single battery that is part of a 'bank' will seriously affect the re-charging process and result in overcharging of other cells and their fast demise. Don't do it.

    Not a lot of...
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    Re: High power resistor

    Yes, unless you specifically WANT a heater, why would you require such a resistor? Power control is usually done using PWM these days.
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