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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by SocMatt

  1. SocMatt

    Electronics NOOBIE!

    The software will be stored in the PIC and will be executed when the power is turned on. Without knowing the software it will be difficult to tell you how the circuit is working
  2. SocMatt

    Current limiting resistor for LEDs.

    positive logic - if you tried running 3 LED's directly off of 6Vac without a current limiting resistor it would work. However it doesn't mean that this is a good technique to use. It is bad practice and the LED's would work for a fraction of the time compared to how long they would work with a...
  3. SocMatt

    Current limiting resistor for LEDs.

    It is always necessary to include a current limiting resistor with LED's. What LED's are you using, what is the forward voltage of the LED's. I would suggest a rectifer and smoothing capacitor with a high power rated series resistor.
  4. SocMatt

    Career Path

    Hi elMickotanko, More and more companies these days are giving staff the oppotunity to further there academic qualifications with day release schemes. I am just finishing the first year of a BEng degree, which i do on day release and my company pays for it. As far as I am concerned this is...
  5. SocMatt

    Excessive Amperage Broke My Fan !?

    Are you sure you've connected the fan the right way round? This can be a common problem when using fans
  6. SocMatt

    I need -5V for my project

    What supply to the circuit have you got? You could use something like an ICL7660 to convert +5V to -5V which would have lower power consumption compared to a 7905 but would take up more space. Up to you to decide
  7. SocMatt

    Capacitor value conversion

    Yes that is 1 nanofarad. It is written in that form to provide a less cumbersome number and to get rid of the decimal point. Similarly 2.7 nF would be noted as 2n7.
  8. SocMatt

    frequency counter

    Here is the code: #include <16F876.h> #fuses HS, NOPROTECT, NOPUT, NOWDT, NOBROWNOUT #use delay(clock=20000000) //one instruction=0.2us #use rs232(baud=57600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8) #bit t1_overflow=0x0A.4 // #bit t1_overflow=0xF9E.0 (PIC18, Reminder) void main()...
  9. SocMatt

    frequency counter

    Hi I need a frequency counter and had success using the example code ex_freqc.c, however now i need the frequency counter to work over two channels. Can i reproduce the code for two channels or is it specific to that input pin of the PIC. Any help would be most appreciated Matt
  10. SocMatt

    PIC16F876 Rom

    The compiler is the CCS PIC C compiler. How do you compress it?? Cheers Matt
  11. SocMatt

    PIC16F876 Rom

    Au revoir, I am writing a program to control timings in an oxygen sensor using interrupts. The chip I am using is a PIC16F876 and the code is written in 'C'. The code I wrote worked correctly, however, now i need to add more processing to the code and it wont compile, as it says the...
  12. SocMatt

    PIC with built in DAC

    Hi, I am using a PIC16C782 which has a built in Digital to Analog converter. However i have not been able to find any commands which refer to setting up or reading the DAC. If anyone could help it would be most appreciated. Cheers Matt
  13. SocMatt

    Urgent! PIC16F84A Help needed

    Cheers for your help but it didn't seem to work. I may have a problem with the practical circuit. Have you any suggestions of any circuit diagrams. Cheers Matt
  14. SocMatt

    Urgent! PIC16F84A Help needed

    Hello Basically, all that is necessary is for the PIC to produce the two repeating waveforms continously. It is not necessary for any specific pins to be used of anything like that. The waveforms will simply be used to drive the input of an oxygen sensor and so needn't sink/source any...
  15. SocMatt

    Urgent! PIC16F84A Help needed

    Hello, I know that this is extremely cheeky, but I desperately need assistance. I need someone to write, or help me write a program to produce what is outlined in this message's attachment. I have very little time to produce this circuit and have absolutely NO knowledge of PIC...
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