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Type: Posts; User: pjmelect

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  1. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    The pink/red bags are good enough for the M.O.D to protect their equipment. The pink/red bags are effective at protecting components from static.
  2. Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

    There are two types of anti static material, one red or pink and the other type black. The black materials are conductive and the red or pink ones are not. The red or pink material work by being a...
  3. [SOLVED]Closed: Re: Proteus ISIS Issue Buss Bits 1 and 11 are connected together but shouldn't be

    Yes I have had this problem, although I have always managed to get it to work after deleting the relevant bus connections, and often it was due to mistakes with the naming.
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    Closed: Re: HKTS 220 Power Supply board troubleshooting

    Check R3 100K to see if it is high in value, put a 1W resistor to replace it if it is. If this resistor is OK then the secondary capacitors having high leakage (and ESR) is the most likely.
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    Closed: Re: 555 and rectified ac Proteus

    Have you tried to connect an earth to the primary side of the transformer?
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    Closed: Re: Can anyone ID this sm diode

    It is not a TVS or a zener diode. An IN4007 would be good replacement or surface mounted equivalent. The IN4007 is not surface mounted but you could solder it in. If we could see more of the circuit...
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    [PIC]Closed: Re: Picstart 16B1 software needed

    These versions of MPLAB were designed to run on Windows 98, however on Windows XP you get read errors from the devices to be programmed which you can correct by deleting a running process with task...
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    [PIC]Closed: Re: Picstart 16B1 software needed

    Unfortunately Microchip no longer has the software on their web site, I have MPLAB 5.4 and 5.7 which I could email to you if you PM me. The files are 13MB or so each if your email provider allows...
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    Closed: Re: PC based Oscilloscopes

    The software for some of these PC based oscilloscopes is often not very good, as the writer of these programs have probably never actually used them in practice. I would save my money and get a good...
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    Closed: Re: HP 54520A Blown Fuse Problem

    I would give the power supply to someone who knows how to fix power supplies. If you want to try and fix it yourself, then from what you have said there maybe no fault with the power supply, rather...
  11. Closed: Re: Need of Equivalent IC for SST89E51RD-40-C-PIE

    You can still buy this chip why do you need the equivalent?
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    Closed: Re: SD card - pull-ups required?

    I have used an SD card without any pull ups. But depending on the micro used this may cause extra current to be drawn when no SD card is present. If in single bit mode (SPI) the three unused SD card...
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    Closed: Re: SD card - pull-ups required?

    The pull-up resistors are for protecting the CMD and the DAT lines against bus floating when no card is inserted. So if the SD card is permanetly fitted, pull-up resistors are not needed.
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    Closed: Re: ATX power supply switch

    On an ATX power supply connecting the PS_ON pin to ground will turn on the power supply, when the PS_ON pin is disconnected from ground the power supply goes off. Logic on the motherboard keeps the...
  15. Closed: Re: How to measure differential signals using an Oscilloscope

    On older oscilloscopes you invert one channel and sum the two channels. One problem with doing this is that the bandwidth is drastically reduced to around 1Mhz depending on the scope.
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    Closed: Re: HP 54520A Blown Fuse Problem

    It is unlikely that that part would cause the problem of the fuse blowing after a minute. It is a inrush suppressor so that after a minute its job is done and no possible fault with it will cause the...
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    Closed: Re: HP 54520A Blown Fuse Problem

    With this type of fault, you will have to reduce the circuit to find the fault. first try removing R13 and R14 and see if the fuse still blows. If not reconect R13 R14 and disconect CR24, and see if...
  18. [SOLVED]Closed: Re: [moved] How to fix Windows 10 Error? (copying files from network drive)

    This error is caused by a corrupt file system either on the networked drive or on the system drive; you should do a system file check on both drives.
    Another possibility is that you are getting...
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    Closed: Re: Low drop voltage regulator

    The AMS1117 has a dropout of 1.1V at 0.8A, at 50mA the dropout is much less.
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    Closed: Re: Low drop voltage regulator

    What about the AMS1117 3.3V ? I as well as many others sell them on eBay for not much money. As wwfeklman said it is important to use the manufacturer’s recommendations as to the input and output...
  21. [AVR]Closed: Re: Proteus: internal Exception: access Violation in module 'UNKNOWN'

    Does your school have a licence for the ATMEG CPU I am assuming that your school has a genuine version of Proteus.
    PIC and ATMEG CPU’s require different licenses which are very expensive.
  22. Closed: Re: I have problem with my proteus 8.4 simulation

    Often this type of error is caused by missing grounds, post your Proteus circuit if you want further help.
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    Closed: Re: Electroncis degree website blocked..why?

    Instead of starting the addres with https: use only http:
    This now works.
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    Closed: Re: input impedance to ADC pin on PIC16F18856

    I disagree, the 470nF capacitor effectively gives an impedance of zero ohms as far as the input to the ADC is concerned, the voltage of the 470nF capacitor voltage is reduced by the charging of the...
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    Closed: Re: input impedance to ADC pin on PIC16F18856

    If the resolution of the A-D is 12 bits then the capacitor needs to be at least 4096 X 5pf to get 1 bit resolution which is just over 20nF I would suggest the use of a 47nF capacitor. As for the...
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