Microcontroller Easy-Downloader v2.2 89C51/52/55

Upgrade only PCBs, the software remains the same as the original project which you can find at Easy Downloader V 2.0.Here you have a version of single side PCBs from the Easy-Downloader V2.0. PCB is 8.5x7cm in the real size of this .PCB some minor modifications compared with previous versions. This version has a MAX232 (or similar) and not the DS275, a single LED (green) to 5Vcc show, also one of the LED (red) to 12/5Vcc, a DB9F connector for serial access (can be connected in series to a cable here DB9F DB9M 3 wire, pin 2 to the PIN2, pin 3 to pin 3, pin 5 to pin 5. I recommend to print using laser printer at a minimum of 300dpi, at the appropriate scale.

"microcontroller progammer"

Be careful to short circuit, should we use all the IC sockets! (Master, Slave - of course, and MAX232)!, In case if there is something wrong is very easy to replace damaged components In addition, there are some parts that is placed under the UC Master and Slave, the UC power supply for the programmer is +15 Vcc and input through the diode bridge .. Around the LM317 is a 3 resistor values require a very precise, we measured the voltage on foot colector 2N2222 (+12 Vcc + / -0.5 when 2N2222 OFF and +5 Vcc + / -0.1 when 2N2222 is ON), you can also place 2 potentiometer for setting R12V and R5V (5k and 2.5k pot). Better to remove the power supply before manipulating the UC!