List of Components for ReTurn v1.0 - PCB rev. r8p (all parts on single PCB)
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Semiconductors:
1x   U1         89C2051         Atmel Flash MCU, contains ReTurn firmware

1x   U2         93C46           128x8 serial EEPROM
                                ATTENTION: the EEPROM must be a 93C46 with selectable
				data organisation of 128x8 bits (Pin 6). EEPROMs with fixed
                                organisation of 64x16 bits are NOT compatible!!!
                                Please refer to datasheet of part intended for use.

1x   U3         4051            8-channel analogue multiplexer
1x   U4         ADC0804         8bit ADC
1x   U5         4021            8-stage static shift register
1x   U6         74HC02          Quad 2-input NOR gate
1x   U7         CNY17-2         Opto coupler
1x   U8         7805            +5V regulator
1x   D1         LED, red
1x   D2         1N4148
1x   D3         LED, green
1x   D4         1N4007

Resistors:
4x   R1,R8-10   4.7 k
2x   R2,R20     2.2 k
3x   R3,R5,R6   220
1x   R4         120
1x   R7         10 k
8x   R11-18     47 k            linear rotary potentiometer,
                                preferably Rohm or Alps
1x   R19        150
  
Capacitors:
1x   C1         150 pF
3x   C2,C4,C30  10 uF / 16V
1x   C3         470 uF / 25V
2x   C5-6       33 pF
1x   C8         1000 uF / 16V axial
14x  C9-13,     100 nF
     C15-23
1x   C24        330 nF

Other components:
1x   X1         Crystal 12MHz
1x   SW1        Push-button (for Snapshot function), SPST, momentary action, 
                tactile, eg microswitch
2x   J1-2       DIN 5pin PCB mount socket
2x              IC Socket 20 pin
1x              IC Socket 14 pin
2x              IC Socket 16 pin
1x              IC Socket 8 pin
1x              IC Socket 6 pin
1x   J3         Low voltage power supply socket (PCB mount),
                1.9mm-2.1mm inside diameter, DIN45323
1x              9V DC power supply unit
1x   CON1       6 pin PCB header (to connect LEDs and button)
1x              Case (eg LxWxH 12,2 x 18,4 x 5,7 cm) 
8x              Potentiometer knobs
5x              Spacer, 20mm

16x   JP1-16    Jumpers!!! (use tinned copper wire)


CON1 pinout:
------------

                     Pin
                   -------
Cathode D1         | 1 2 |    +5V (Anode D1)
Cathode D3         | 3 4 |    +5V (Anode D3)
Snapshot button    | 5 6 |    Ground (for button)
                   -------


Copyright (c) 2002 Thomas Brandl
Email: tbrandl@rocketmail.com