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At a first sight it could seem difficult, but you can soon realize it is a very simple procedure, in 74hc541 same time allowing you a versatile use of the board. If you wish to realize the Development Board after reading, in particular, the “Acknowledgement and disclaimers” section 74hc541, you can find here the links to save the images you need at dpireachable anyway in other points of this page. Some applications Concerning possible applications, this board allows you to have a surely working base circuit and to interface it easily, so allowing you to focus just on the program and on the crcuit being developed.

If you wish an answer, please include your address. For programming, see further. The distance between jumpers’ pins is 7. After the description on hot to set the switches concerning the LVP, we now describe how to set up the switches for the normal working. If LVP of your PIC is on, as an example when the chip is just come out of the factory, in order to have it working without any problem you should follow datasheeh instruction in the section ” normal operations “.

74HCN datasheet, Pinout ,application circuits 74HC/HCT Octal Buffer/line Driver; 3-state

See details in the section “Programming”. Functions of connectors and dip-switches If you want, instead of reading now the descriptions of the many connectors and dip. When you are in doubt, and you should use two different power supplies, it is better to replace one of them with a battery, because datashset is floating and takes the same reference of the circuit it is connected to.


The LED D2 shows the supply out of the dxtasheet If you want, instead of reading now the descriptions of the many connectors and dip. Remark on how to identify switches and connectors’ pins References to a particular switch of the dip-switch Sx will be made as Sx-n, the same convention for connectors JPx. You will not be able, of course, to measure hundredths of millimeters, and maybe not even tenths of millimeters it would not be anyway very meaningful, given the size of pads and holesbut if your measure is a little bit more than 20 mm your printing should be good.

Of course, not to make coarse mistakes, you could take as an example dwtasheet distance between the first and the ninth pin, looking if it is 2. Normal operations How to set switches to select the different working modes We will now describe hot to set up the switches in the different working modes. The fuse should stop the input voltage to the when the current sunk is higher than the nominal value of the fuse; the fuse should protect the external power supply in input to thebut has no effect on the supply connected through JP8 or 74hc541j besides, in case of short-circuit, it is not sure at all that it is able to avoid damages to the chip, the programmer, possible external circuits and to the power supply itself, whichever connector J1, JP8 or JP9 this one is connected to S7 inserts the LED D3, which shows the presence of supply to the PIC, whereever it comes from from thethrough S1, from JP9 through S5 or from JP8 through S6 The LED D4 shows the presence of a voltage between the pins 1 and 2 of the connector JP8; when S and S are closed, that supply is the one feeding also the PIC from thethrough S1, or from the programmer, through JP9 and S5, or from JP8.

The images below are at low resolution, to save download time, but, as said, links allow access to higher resolution images. As previously said, the dataasheet working mode is selected by mean of dip-switches see again figure 4 – Components placement and tracks layout. I have choosen to use a switch for each pin that sometimes has to be insulated or connected to other particular pins i.


The minimum value in the RC net is the value of R4. If you wish to contact me for informations and suggestions: As an instance, if you supply the PIC and the programmer with two different power supplies, the necessary connection between the two “common” terminals could be very dangerous for your circuit!


If you haven’t saved them yet, through the links in the beginning of this page, you can do it now. The potentiometer allow you to tune the frequency on a wide range.

Being this material at free disposal of whoever desires it, it is absolutely forbidden any form of use for commercial purposes. Back to Home Page E-mail address. Datssheet already said, take care to avoid any conflict among supply sources.

To reser the microcontroller a Reset switch S4 is available, and sometimes better. Fare click qui per la versione Italiana. This board have been designed for PIC16F and tested with it and on this page we’ll always refer to it ; the circuit should be anyway suitable for mentioned microcontrollers, too 18F4x2 and 18F4x8with the following notes: It is of course possible to mount later a part or all the components not soldered at first.

Depending on the program, it can be useful or necessary to reset the PIC by S4.

Before going on with the description of of the circuit, let’s introduce here a remark. If you wish, just send me your opinion even in an anonymous form.

Let’s now describe the main characteristics of this circuit: