- on Home & Garden
- Published in issue 5/2003 on page 0
Accurate timing from an AT90S1200 micro
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1,R12,R13,R14 = 10k?
R2,R10,R11 = 470?
R3-R9 = 100? to 150? (see text)
C1 = 1µF 16V radial
C2 = 100nF
C3 = 10µF 16V radial
C4,C5 = 22pF
D1 = LED, red, 3mm dia.
IC1 = AT90S1200-12PC, order code 020296-41
LD1,LD2 = HD1131O (see text)
T1, T2 = BC327
BT1 = two 1.5V AA or AAA batteries with holder
Bz1 = 5V DC buzzer
S1 = on/off switch
S2,S3,S4 = pushbutton with 1 make contact (see text)
X1 = 4MHz quartz crystal (lowprofile model)