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Digital Bubble Level and Active Stroboscopic Disc for Turntables

Fine-Tune Your Record Player With This All-In-One Tool

Digital Bubble Level and Active Stroboscopic Disc for Turntables
Digital Bubble Level and Active Stroboscopic Disc for Turntables
To operate at its best, a turntable must be placed in a perfectly horizontal position and spin at the correct speed. The Raspberry Pi Pico-based tool presented here performs both of these checks and, through an innovative solution, features a stroboscopic disc that does not require the usual 50 or 60 Hz pulsing strobe light.
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Materials

Component list

Component List

Resistors

R1 = 3.3  kΩ (all 1/4 W 1%)

R2 = 100 kΩ 

R3 = 470 kΩ 

R4 = 330 Ω 

R5 = 100 Ω

 

 

Capacitors

C1, C2 = 100 nF, 50 V, polyesther or ceramic multilayer

C3 = 100 µF, 10 V, electrolytic

 

Semiconductors

Q1, Q2 = FDS9435A P-Channel MOSFET

Q3 = 2N7002 N-Channel MOSFET

D1, D2, D3, D4 = BAT46W Schottky Diode, Small Signal

U1 = TP4056 Charging module, no protection

U2 = GY-521 MPU-6050 Module

U3 = Raspberry Pi Pico board

 

Miscellaneous

Display = Waveshare 1.28” 240x240 Round LCD 19192

BUZZER = SMD Buzzer

SW1, SW2 = N.O. pushbutton, PCB type

BAT1 = 3.7 V LiPo battery, 200 mAh, with protection

M/F strip connectors

Spacers

Solderable, round breadboard,  PC-15, 60 mm

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