LPT oscilloscope

1. Introduction


For this constructions I was inspired LPTScope from Bojan Banko. I build a new hardware and modify software with permission from author.

This construction is free for personal use, for commercial use you need permission from author (from author original software too).

 


 

 
2.Technical statements

Supply voltage                                            ~9 - 15V
Input voltage DC/AC (peak to peak)          0,2V; 0,5V; 1V; 2,5V; 5V; 25V
Max. input voltage                                     100V
Input resistance                                        1MW
Maximal sample rate                                 theoretical   600kHz
                                                                  practical      300kHz
Vertical shifting of zero                             -10% to +60% input range
Setting up of trigger                                  0 to 100% input range
Connection to PC                                     bidirectional LPT port
 

3.Circuit

For A/D converter I use TLC0820 with protection resistors R1-R8. Input circuit created voltage divider 1:5 with switch PR1.
Switch PR3 set up zero for input and switch PR4 set up measure of AC/DC signal.
Input amplifier is created IO2A. Switch PR2 set up amplify 1:1, 10:1 and 25:1. Summary amplifier is created IO2B and shifting zero for measure AC signal.
Potentiometer P2 and IO2D set up trigger.
The oscilloscope use several stabilized DC voltages  +5V (IO5), +9V (IO3), -9V (IO4).
 
4. Mechanical design

For construction is used one side PCB with several connection wires (layout chart of components). For oscilloscope is used box U-KM26, see figure 1 - 2 - 3.
 
5. Setting up




First you install supply part inclusive of K3. You check on voltage +5V, +9V, -9V. Now you install IO2 and all components except IO1 and check function. If it is all right, you can install IO1 and resistors R1-R8 (SMD).
You must set LPT1 on bidirectional or ECP or EPP in BIOS and then connect oscilloscope to LPT1 port PC.
 
6. Software LPTScope

Program is freeware, included source code.
If you connect hardware for the first time, you start measurement - pres button "Run". You should to see horizontal black line. Line have vertical shifting, when you turning potentiometer P1. When line not shifting, you must set regular reading from A/D converter (press button AD on toolbar) by means of set up number waiting cycles. You turning potentiometer P1 and look at voltmeter. You must see stable data and data must react to turning potentiometer. Regular reading you check up on to signal applied to input.

One record - activate measure, after buffer is full, measure be stoped
TRG INT - internal software trigger
TRG EXT - internal hardware trigger from input signal. You can modify hardware to external trigger
Violet line - shifting zero of input signal. When is negative shifting, negative voltage not display (it display as zero).
Use mouse - when you press left button, you can movie mouse and you will see voltage (Y axis) and time and frequency (X axis)
Time base - set scale on axis X
Y base - set scale on axis Y
Oscilloscope input correction - for right display input voltage (input range)
Sampling rate - setting up when set number waiting cycles for reading from A/D converter
Sample buffer - for saving data from A/D converter. Use max 10000 for oscilloscope and max 1000000 for One record mode

You can see max 32000 points on the screen. When sample buffer is bigger and you want to see whole buffer, you must set bigger Time base = 32000/(Sampling rate * Sample buffer).
 
Download LPTScope version 1.3   
Download source code
 
7. Components list
Electrolytic capacitors
C1,C2                  220 uF/25V
C3,C4,C6,C7       47 uF/16V
C5                        100 uF/25V
C23                      22uF/16V
 
Ceramic capacitors
C8, C9,C10,C11,C12,       
C13,C14,C15,C16       100 nF
C18,C17                      22 pF               
C20                             12 pF
C21                             47 pF
 
Plastic capacitors
C19                100 nF/250V
C22                100 pF/250V
 
Diode
D2,D1           1N4005               
D3,D4,D7      BAT48               
D5,D6           1N4148
ZD1                BZX83V5,6V               
ZD2,ZD3         BZX83V10               
ZD4                BZX83V5V1               
 
Integrated circuit
IO1                TLC0820               
IO2                TL074               
IO3                78L09               
IO4                79L09               
IO5                78L05
 
 
Connectors              
K1                CAN25VP               
K2                BNC-Z 50RW               
K3                SCD-016       
 
Inductors       
L2,L1                220 uH
 
Switches
PR1,PR3,PR4        P-B143               
PR2                      P-GS373       
 
Potentiometers PC 1221N      
P2,P1                10k
 
Resistors  SMD 1206
R1,R2,R3,R4,R5,R6,R7,R8        680
 
Resistors 0,4W
R9                1k
R10,R11        100k
R12                120k
R13                680k
R15,R20,R21,R22,       
R23,R24,R25     4k7
R16                470
R17                56
R18                180
R19                15
R26,R30         10k
R27                15k
R28                22k
R29,R31,R33    10k
R32                8k2
 
Resistors 2W
R14                10k           

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