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Title: Dual Trace Oscilloscope: U5 ST7735s TFT Screen

This document describes a circuit diagram for a virtual ground system using an HT7333 voltage regulator and three MCP6L92 digital potentiometers. The circuit uses resistors, capacitors, and a lithium ion battery to regulate and distribute a 3.3V power supply to the potentiometers from the voltage regulator over two channels while allowing for reset of the system.

Uploaded by

Abdelkader Mechernene
Copyright
© © All Rights Reserved
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171 views1 page

Title: Dual Trace Oscilloscope: U5 ST7735s TFT Screen

This document describes a circuit diagram for a virtual ground system using an HT7333 voltage regulator and three MCP6L92 digital potentiometers. The circuit uses resistors, capacitors, and a lithium ion battery to regulate and distribute a 3.3V power supply to the potentiometers from the voltage regulator over two channels while allowing for reset of the system.

Uploaded by

Abdelkader Mechernene
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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1 2 3 4 5 6

VIRTUALGND
J1 U1
3.3V
INPUT HT7333
1 5 4
OUT IN
3.3V

GND
2
3 CH1
A A

2
CH2

U2A U2B
MCP6L92 MCP6L92 3.3V C1 R1 C2 C3 C4 SW1
C5 C6

8
100n 100k 100n 100n 100n power
3 5

V+

48
36
24
+ + 10u 10u

1
R2 R3
1 7 U2C

VDD
VDD
VDD
100k 100k

VDDA

VBAT
MCP6L92 7 JP1
2 6 NRST
- -

V-
GNDD boot0 BT1
R4 R5 44 GNDD

4
BOOT0
82k 82k
Lithium Ion 3.7V
5
PD0 Y1
6 GNDD
R7 R8 GNDD PD1 8MHz R6
U4C 4066 U4A 4066
82k 82k 1k
9 8 2 1 2 GNDD GNDD
PC13
3
PC14
4 C7

13
PC15
6

10u
R9 R10
U4D 4066 U4B 4066 10 18
39k 39k PA0 PB0
10 11 3 4 11 19
3.3V PA1 PB1
12 20 GNDD
14

PA2 PB2
13 39
12

PA3 PB3

5
B B
VDD

14 40
PA4 PB4
15 41
PA5 PB5
U4E 16 U3 42
PA6 PB6
4066 17 43
PA7 STM32F103C8Tx PB7 3.3V
VSS

29 45
PA8 PB8
30 46
PA9 PB9 Vcc
31 21
PA10 PB10 DC
7

32 22
PA11 PB11 RES U5
33 25
PA12 PB12 CS ST7735s TFT screen
34 26
PA13 PB13 CLK
GNDD 37 27
PA14 PB14

VSSA
3.3V 38 28

VSS
VSS
VSS
PA15 PB15 SDA
GND

47
35
23
8
SW2 R11 R12 R13
Rotary_Encoder_Switch 10k 10k 10k
GNDD
S2 B
C BLue Pill Module GNDD
S1 A

C C

C8 C9 C10
3.3V 100n 100n 100n

U6
SW3 R14 R15 R16 OPTION: LithiumIon
Rotary_Encoder_Switch 10k 10k 10k charger module
GNDD
S2 B
C
S1 A

C11 C12 C13


100n 100n 100n
GNDD
(Blue Pill)
WilkoL
Sheet: /
D GNDD D
File: dual_trace_oscilloscope.sch
Title: Dual Trace Oscilloscope
Size: A4 Date: 2020-06-17 Rev:
KiCad E.D.A. kicad (5.1.4)-1 Id: 1/1
1 2 3 4 5 6

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