Papers & notes concerning electronics

• wireless access point hack, M25P64 flash memory programming
• [Datasheets directory](http://boris.maetech.it/docs/datasheets/)
• Slides [“elettronica open source - microcontrollers”](http://boris.maetech.it/docs/papers/opensourceelectronics-microcontrollers.pdf) : overview sui microcontroller, utilizzate in occasione del Linux Day 2011 a Pordenone
• Types of Plugs IEC standard
• Cable designations standards also pdf version

B = 0.125
C = 0.2
D = 0.25A
E = 0.375A
F = 0.5A
X = 0.68A
G = 0.75A
H = 1.0A
J = 1.25A
K = 1.5A
L = 1.75A
N = 2.0A
O = 2.5A
P = 3.0A
R = 3.5A
S = 4.0A
T = 5.0A

(thanks to Carlo Pollice)

• GY socket, one pin is bigger than the other, used for MSD discharge lamps.
• GX socket, both pins same thickness, used for PC-proj's 1000W lamps.

 numbers refer to DB9 connector pins
               IR led
 2 --------+-----|>|------+-------- 3
          |-----|<|------|
              RED led

             photodiode
 5 -------------|>|---------------- 9

 7 -------( cable main shield )

                6.0K-9.7K
 6 -------+-------/\/\/\/\---------- 1
         |
         |-------( sensor shield )

Note: Male ps/2 to PC, female PS/2 to keyboard (optional)

Note: +5Vcc line interrupted by external adaptor plug: if plug is inserted, ps/2 vcc is disconnected and external + goes to scanner

External station (portiere elettrico):

• 1 don't know, maybe not amplified output
• 1A amplified microphone output
• 2 input
• -/+ audio power supply
• L should be LED
• G/T pushbuttons common
• Ux pushbuttons

Power supply module (786/15)

• PS(2) Tone generator output
• C(2)/SN(2) Current sensing circuit (to make relay trip)
• +/- Audio power supply
• -J Amplified output for intercommunicating circuit (audio is revealed from “+” !)
• Relay contacts:
  • 2,5,8 common
  • 1,4,7 normally open
  • 3,6,9 normally closed
  • C1-SN1 makes relay trip to NO, C2-SN2 makes relay relax to NC

Internal station

Connector marked as “4” is USB device (input), optionally plus power.

P/N 14J0930, 14J0624 — FRU/SMU 42M5673, 42M5671

Referring to the image, pin 2 is D-, pin 3 is D+, pin 4&5 are GND.

A guide says pin 1 should be 5V input and pin 6 12V input, but I am not convinced about this.

mcu      DAPA      STK200=ponyprog         DASA (serial)
VCC       3          -
RST       16         9                        7 (4.7k res. series + 5.1 zener diode to gnd)
SCK       1          6 (opt. 1k r)            4 (4.7k res. series + 5.1 zener diode to gnd)
MOSI      2          7 (opt. 1k r)            3 (4.7k res. series + 5.1 zener diode to gnd)
MISO      11         10                       8 (no add'l comp)

RJ45 male (cisco)           DB9 female (PC)
RJ45    DB9
-       1
3       2
6       3
7       4
4+5     5
2       6
8       7
1       8
-       9

 ________
/       /|
|||||||| |
1      8
contact view
(hook is behind)

Dumb segnalling
UPS DB9 PC DB9
4       5
2       8
1       4
5       1
8--10k--1

Smart cable
UPS DB9 PC DB9
2       2
1       3
9       5
a version says
        1+2
        7+8
another says
        1+4
        7+8

Terminal is 2400:8n1

pin funct
1+2 gnd
3   led buffer enable #g1
5   44780 enable
6   44780 r/w
15  vcc
16  gnd
17  44780 rs + led buffer clock
18  db4
19  db5
20  db6
21  db7

     |^^^^^^^^^^^^^^^^^^^^^^|
^^^^^|                   o  |   <--- 3.3V out
     |  component        oo |   <--- GND
usb  |    side           oo |   <--- RX (from ext.device to the pc )
 A   |                   oo |   <--- TX (from the pc to the ext.device)
_____|                   o  |   <--- 5V out
     |______________________|

used for intercoms, etc.. 4 pin XLR : 1. MIC GND - 2. MIC SIGNAL - 3. EARPHONES GND - 4. EARPHONES SIGNAL