USB Magic Eye
Valve indicates CPU load
Materials
Gerber file
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Extra info / Update
Features
- display of CPU load as a percentage (0 to 100)
- power and control over USB
- ATtiny microcontroller with software USB interface
- two variants with the same firmware
- display using moving-coil meter or EM84 ‘magic eye’ valve
- very low component count
- low-cost, readily-available indicator valve
- current consumption (moving-coil version): less than 100 mA
- current consumption (magic eye version): less than 500 mA
- freely downloadable PC software and microcontroller firmware, with source code
Component list
R1 = 1.5kOhm
R5,R6 = 15kOhm
R2 = 22kOhm
R4,R7 = 47kOhm
R3 = 330kOhm
Capacitors
C6, C7 = 22pF
C2 = 100nF
C1,C3,C4 = 100nF 250V
C2 = 100µF 25V
Inductor
L1 = transformer; coil former # B66418WL008D1 with clip # B66418B2000 and core # EFD20 B66417GX187
Semiconductors
D1 = LED, red, 20mA
D2,D3 = BY448
T1,T2 = IRLU014
T3 = MPSA42
IC1 = ATTiny2313-20PU, programmed, Elektor Shop # 090788-41
Miscellaneous
X1 = 12MHz quartz crystal
K1 = USB socket Type B
V1 = EM84 (6FG6) and 9-way (noval) valve socket
PCB, Elektor Shop # 090788-1
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