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Home › Magazines › 2010 › January › USB Magic Eye

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USB Magic Eye

Valve indicates CPU load

Published in issue 397, January 2010

USB Magic Eye

Herwe use a green glowing valve as a CPU activity meter. Power and control are both provided by the USB port. A simpler variant on the circuit, using a moving-coil meter, is also described. For the CPU meter we chose the USB stack described in application note AVR309 by Igor Cesko.

Extra info, Updates

Components

Relevant websites

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Resistors
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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Magazine January 2010
UK397 (US $ 7.50)
 

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ATtiny2313-20PU, programmed
090788-41 (US $ 16.00)
PCB, bare
090788-1 (US $ 16.00)
 

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Software

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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