Upgraded version by Puiu

    The upgraded part is only the PCB,the software remains the same as in original project which you can findat  EasyDownloader V 2.0
    Here you have a single side versionof PCB of the Easy-Downloader V2.0 (by WichitSirichote). The board is 8.5x7cm in a full size. That newPCB has some small modifications comparing to original scheme. It has anMAX232 (or similar) instead of DS275, one LED (green) for 5Vcc indicating,also one LED (red) for 12/5Vcc, one DB9F connector for serial access (canconnect here a serial DB9F to DB9M cable [3 wires, pin 2 to pin2, pin 3to pin 3, pin 5 to pin 5]. All can be easy done in ONE SIDE PCB with only1 (one) strap! I recommend to print the GIF picture (using a laser printerat least 300DPI) at right scale (you can do some experiences on normalpaper to find the correct scale for printing [you can place over the holeson the paper an 40 pins IC to see if it match over the holes, once is matching,the other parts will also do, and you can print it or use the pcb filewhich is included] and print it on a full transparent UV sheet of plastic(transparent plastic sheet for laser printers will be OK) and than, usingthe Positive spray technology (spray, UV exposure, developing, etching),to transfer the GIF on the copper side of board (the GIF is bottom sideview from top, so, turn it [mirror] before put it on board). Take carefor short circuits! A good ideea is to mount all 3 ICs on sockets (Master,Slave - of course! and MAX232), in that case if something is going wrongis very easy to replace the defective part! Also, there are some partswhich are mounted under the Master and Slave uC, so you can mount thembelow (inside) the uC socket. The power supply for the programmer is somewhereat +15Vcc and the input is via a bridge diode. Around LM317 are 3 resistorswhich require very precise values, I had not, so, I tried and combinedseveral parts until I measured right voltages (+12Vcc +/-0.5 when 2N2222is OFF and +5Vcc +/-0.1 when 2N2222 is ON), you can also put 2 pots insteadof  R12V and R5V (5k and 2.5K pots). Better disconnect power supplybefore manipulating uC!
 

Figure 1: Circuit Diagram of Easy-DownloaderV2.2
 

Figure 2:     An PCB Overviewfrom component side
(blue=bottom layer, red=top layer or strap,yellow=components[silkscreen overlay])
[click to enlarge]
 

Figure 3:   PCB bottom layer overview(from component side) and holes
[click to enlarge]
 

Figure 4:     Bottom layerin 2 colors, ready for printing
Click on image for good resolution GIF readyfor printing
Bottom layer is viewed from component side(top)
[click to enlarge]
 

Figure 5: An ready-to-run board overview
 

Also here you have the PCB (Protel 2.7.1) easy52.pcb
Here is the BIN filefor AT89C51 Master
 

---