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Type: Posts; User: betwixt

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  1. Replies
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    Closed: Re: Soldering on Battery Terminals

    No, but it is an alternative that doesn't risk the danger of soldering directly to the battery.

    Spot welding is probably the best solution if you have the equipment to do it. Intense heat is...
  2. Closed: Re: LNK304 input voltage below the datasheet minimum value...damage?

    I can't see anything in the data sheet that suggests damage will occur but running it below specified input might have consequences on the regulated output.
    I assume you are using a schematic...
  3. Closed: Re: Tuning of varicap diode in a magnetic loop antenna based on modulating signal

    AFC was (until PLL came along) used extensively to keep receiver local oscillators tracking an incoming signal. For receiving, there would be little point in tuning the antenna so accurately, even...
  4. Closed: Re: Does my power converter have the correct voltages?

    The transformer (converter) should have a rating HIGHER than the console so you are OK. What Barry is saying is there is only at most 3W safety overhead so you are close to the limit. A transformer...
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    Closed: Re: Dirty circuit board causing failure

    No, the braid removes the solder by capillary action. The fine spacing between the wires in the braid causes a meniscus to form in the gaps and it's that that draws the solder into it. If you splay...
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    Closed: Re: Dirty circuit board causing failure

    I think we all know point 3 from personal experience :???:

    Well done for getting it going. If you want to replace the switch, keep the original for reference and search for a similar one. It...
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    Closed: Re: Dirty circuit board causing failure

    Desoldering wick is probably the best thing to use for that kind of component.
    The best temperature depends on the kind of solder you use. The older type which was made of lead and tin is best...
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    Closed: Re: Dirty circuit board causing failure

    You only use hot air for soldering/unsoldering surface mount components (SMD) but all the parts on that board are "through hole" so conventional soldering methods are used.

    I strongly suspect your...
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    Closed: Re: Dirty circuit board causing failure

    All that board holds is a volume control, a switch, an LED and an input jack socket. The switch sends a power signal back to the speakers and also turns the LED on or off.

    If it has stopped...
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    Closed: Re: Soldering on Battery Terminals

    Spot welding uses far less overall heating power. It is intense but only for a very short period.
    Soldering requires the surface to heat up to solder melting temperature and on a cell that might...
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    Closed: Re: copper pour in top layer with vcc net

    Technically, if you flood with VCC, as far as signals see it the situation is the same as flooding with GND as they should be at the same signal potential. I'm afraid it looks like some other error...
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    Closed: Re: copper pour in top layer with vcc net

    We have no idea of the design of your controller or the exact PCB layout but in general, there are no reasons why you can't use any layer for any connection without problems. Inner layers are...
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    Closed: Re: Coin Slot acceptor Timer using PIC16f84a

    We can't answer that without knowing how the coin acceptor identifies the kind of coin inserted. It must produce some different signal depending on which coin was used and we need to find a way the...
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    Closed: Re: copper pour in top layer with vcc net

    There are no hard rules about this as long as the pour isn't shorting anything out.
    Beware of things like metal bodied components or heat sinks that lie against the surface but must not touch VCC....
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    Closed: Re: Dirty circuit board causing failure

    Warm soapy water is probably the worst thing you could have used, it dissolves the lubricants in the controls and probably introduces new corrosion.

    Please show us the other side as well, we all...
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    Closed: Re: Diagnose circuit board issue

    I'm guessing that is the remote sender board, it appears it isn't sending any RF signal or the receiver isn't picking it up. With only two units it can be difficult to tell which end is responsible,...
  17. Closed: Re: dsPIC30F2010 - 30 I/SP restarts at interval of 20seconds for no known reason

    I'm not that familiar with dsPIC30 series code but a restart at fixed intervals regardless of the coding strongly suggests a watchdog issue. I assume the line "_FWDT(WDT_OFF);" turns it off, is there...
  18. Closed: Re: how to design a thermostat without Microcontroller?

    I agree with c_mitra, the relay isn't the problem. The chattering is because the circuit driving it is telling it to turn on and off rapidly. That is most likely because the difference between...
  19. Closed: Re: how to design a thermostat without Microcontroller?

    It could be inadequate hysteresis or it could be that the supply line voltage is dropping slightly as the relay operates because of the additional current flowing through its coil.

    First...
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    Closed: Re: HELP with Schematics for magnet launcher

    Firstly, make sure you are aware of how dangerous this thing can be. A capacitor bank charged to ~650V can kill so keep fingers well out of the way and make sure it is well enclosed in a...
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    Closed: Re: help with speed control

    Not enough information.
    What motor does the compressor use?
    How is it powered (12V DC, 12V AC or is it 12V from a power supply?)
    What kind of speed controller, what are its ratings?

    Brian.
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    Closed: Re: Ascii to BCD Conversion

    No need to convert to BCD, just create a second array containing the bit pattern of segments and drive the port with it directly.

    hint: think of the segments as bits in the port, for example...
  23. Closed: Re: [Microcontroller] Voltage Reading without ADC

    For accuracy there is no substitute for an ADC. If you have two spare digital pins you could consider adding an external I2C one.

    If you want simplicity but not accuracy, you can do it by timing...
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    Closed: Re: Booster converter Circuit

    You could argue that 9V was only necessary to power the control circuits and they are relatively low power in themselves. It is true that if you could get enough power from the tree it would be...
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    Closed: Re: Booster converter Circuit

    If you have a 9V supply you can use the MOSFET will work fine. The reason I suggested a BJT is they need a much lower voltage between base and emitter pins to make them conduct but that was before...
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