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Type: Posts; User: betwixt

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    Closed: Re: What wire is this? Old 2009 TV

    Figure of 8 twin cable fitted with 4mm plugs.

    You can use twin power cord wire to replace the cable and the plugs are cheap and easy to find.

    Brian.
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    Closed: Re: public hex to asm possible to get

    Patching a HEX file is not something we would normally do so don't worry about learning it too much. Having said that, I think most of us 'more experienced' engineers have had to do it once or twice...
  3. Closed: Re: Baud rate limitation in PIC Microcontoller

    Your calculations are correct and you can't get closer while using a 16MHz clock. It might just work, the error is about 2% which is the 'rule of thumb' limit for serial speeds. The internal...
  4. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Fast diodes are no different for audio applications than 'slow' ones. Faster does not make them better any more than fitting a jet engine to a bicycle makes it quicker. Each type of diode has it's...
  5. Closed: Re: Baud rate limitation in PIC Microcontoller

    The maximum Bauds rate is determined entirely by the clock frequency.
    The rated maximum clock frequency is 20MHz, if pushed beyond that it might still work, and the Baud rate may be higher, but...
  6. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    ... but would there be ringing anyway in a circuit using 1N400x rectifiers?
    The implication is the PSU is using 50/60Hz from a mains transformer so ringing shouldn't be an issue.

    Brian.
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    Closed: Re: sine/cos encoder to digital

    What format is the encoder data at the moment? Presumably analog if it needs converting first.

    Brian.
  8. Closed: Re: Rectifier diodes with bypass capīs & gounding speaker basketīs

    Replacing 1N400x with BYV27 series will have ZERO effect in a standard 50Hz/60Hz power supply.
    If the power supply uses high frequency (SMPSU) it should never use a 1N400x rectifier in the first...
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    Closed: Re: instruction set translator

    ... but good luck re-writing them to work on an 8051 system!

    Brian.
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    Closed: Re: instruction set translator

    They rely heavily on look-up tables. There will be a table for each instruction that tells it whether it is a single byte or multi-byte (or multi-word) instruction and how many cycles it takes to...
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    Closed: Re: Using Linux on ARM A9 cortecx

    Sounds like VNC is missing altogether, you probably need to install it.
    Also try "localhost:1" or "localhost:5901" as the connection address.

    Brian.
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    Closed: Re: Multiplexer garbage values

    Two potential causes are:
    1. if there is any difference in ground potential between the MUX and DAC it will show as an error.
    2. If disabled (~E is high) the output will float rather than go to...
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    Closed: Re: Ask impression 960 projector

    Almost certainly this is a power supply problem. A "bridge" in a power supply usually refers to a "bridge rectifier" but they are extremely reliable and would be one of the last suspects for being...
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    [PIC]Closed: Re: PIC16F1934 Timer0 and some other stuff

    TMR0IF is a flag (a bit that signifies something happened) in the interrupt register, not the timer itself. The timer runs continuously, counting 0 -> 0xFF repeatedly as long as it is enabled.
    ...
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    [PIC]Closed: Re: PIC16F1934 Timer0 and some other stuff

    The missing link here is you are not utilizing the interrupt at all. The interrupt routine (ISR) is called automatically by the timer module, you don't have to read it or put it in your program...
  16. Closed: Re: Power handling capacity of mobile phones,small satellite subsytem andwind profier

    Femto Watts to Mega Watts. Are you talking about uplinks, downlinks, power consumption, power emission, overload capability, ERP or something else?

    Brian.
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    Closed: Re: Solar Monitor Box PCB fix

    We have no idea what is at the other end of the cable!

    If we assume (that is the best we can do) that the black wire is negative and red wire is positive, because that is a convention, from left...
  18. Closed: Re: 12v DC proximity detector for use on truck (2-3 feet range)

    Discriminating what is about to hit is very difficult but if you can live with just a short range proximity sensor, look for ultrasonic devices. They are the things usually used to beep when you get...
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    Closed: Re: instruction set translator

    The hard way I'm afraid. The codes are quite different, including that one is an 8-bit processor and the other is 16-bit.
    You need to read the EPROM byte by byte and use software to look-up the...
  20. Closed: Re: Help to build my auto disconnecting circuit.

    For WiFi or Bluetooth control from a mobile phone there is no practical alternative to commercial modules. They are both very complex systems that rely on components that cannot be hand assembled.
    ...
  21. Closed: Re: Help to build my auto disconnecting circuit.

    A simple relay and delay circuit will cut the power either by direct switching or by a relay.
    If you want to set the delay by WiFi it gets much more complicated, you can make a timer that logs in to...
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    Closed: Re: inverter output Vhigh voltage

    How do series connected buffers increase the output capability?

    Brian.
  23. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Unbalanced switching just creates distortion in the waveform and a DC offset toward the voltage you are not pulling down. In most cases it would be insignificant but for appliances at the end of a...
  24. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    "Burst firing" in this context is no different to mechanical thermostats but operating a bit faster. The alternative is phase control as in conventional lamp dimmers but for heavy loads that...
  25. Closed: Re: Regulating temperature of mains connected heating element: Skipping mains half cy

    Both are bad, especially the one in post #6. By alternating the half cycles you are creating a 25Hz (I think the fundamental is 50Hz in your diagram) offset, in truth it probably wouldn't cause too...
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