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Papers & notes concerning electronics

Papers

SMD Fuses Letter to Value Chart

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)

D-Sub connectors

Lamp sockets

  • 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.

Pinouts & Wirings

DUCATO LAMPADA VANO MERCE

Red/blue = +12V (subject to timeout) Green/black = 0V door switch Black = 0V

       +---------------------+
conn.  |                     |
| | |  | +-----(X)----+---/--+ switch 1
| | +--+ |     lamp   |
| +------+            +---/--+ switch 2
|                            |
+----------------------------+

Spencer Resusci Power Plug

The socket used is an XLR

Pin 1 = +12V

Pin 2 = GND

Nellcor(r)/Sunrom pulsioximetry sensor

 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 )

Symbol LS2106 barcode scanner ps/2 wiring / pinout

To scanner PS/2
Rj45 pin wire colour header pin function IDC pin wire col din pin
orange 1 data out 2 red 1 (male)
red 2 +5 Vcc 4 green 4 (male)
13 purple 4 (female)
yellow 3 ground 3 orange 3 (male)
10 orange 3 (female)
green 4 clock in 5 purple 5 (male)
brown 5 clock out 12 green 5 (female)
purple 6 data in 14 red 1 (female)
NC - - shield 6 shield 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

METEOR START-UNI 1ST052642 barcode scanner wiring

The handheld scanner presents a cable with a DB9 female on its ending. It has an adapter from DB9 Male to 2 x PS/2 (DIN) Male & Female. Inside the handheld scanner, the cable attaches to K2 on an aux pcb with a 232 transceiver and the pushbutton switch. K1 on this pcb goes to the real barcode scanner PCB assy. The following table represents wiring, between brackets wiring through the RS232 transceiver.

PS2 male PS2 female DB9 (scanner) wire colour K2 K1 note
4 4 9 black 1 1 VCC +5V
3 3 7 purple 2 2+3 GND
4 switch to gnd
5 4 green 5 5 ps2 clock out
1 8 grey 6 6 ps2 data in
3 yellow 8 (7) rs232 RX (from host)
5 blue 7 (8) rs232 TX (to host)
1 1 brown 3 9 ps2 data out
5 2 red 4 10 ps2 clock in

Not mentioned pins are Not Connected. The aux pcb also has a jumper and a 7805 footprint for +12V supply from the same K2 pin 1. The jumper & 7805 footprint are between K2 pin 1 and K1 pin 1.

Urmet domus power supply and peripherals

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

IBM 4820 Touch monitor (ELO 4500U)

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.

AVR simple programmers

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)

Cisco rj45 rs232 terminal console

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)

APC Smart UPS communcation rs232 cable

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

Sharp LCD module 1x16 alpha chars (taken from a laser printer)

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

Chinese PL-2303 USB to ttl serial interface

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

Professional 4-pin-XLR headsets

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

Cinema-tech

  • Dolby Sorround = fittizio, parte da una traccia stereo e ricrea il rear con un po di delay
  • Dolby Spectral Recording (per il cinema) e Dolby Pro Logic (per l'home teather) = appare il canale centrale e (opzionale) il canale LFE (low frequency effects)
  • Dolby Digital = codifica AC3 multicanale
  • DTS = più raffinato rispetto al Dolby Digital

CINEMASCOPE da pellicola [-] apre a schermo 221:100 [ – ]

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