Meeting Cost Timer
Hidden costs become totally transparent!
This is a MEMBER ONLY article. You need a subscription to read this article.
- Access to Elektor archive and 5,000+ Gerber files
- Receive up to 8 magazines per year (digital and/or paper)
- 10% discount in the Elektor store
Available from €4.95 per month.
What is Members Only
Elektor is committed to providing high-quality content on electronics, catering to tens of thousands of paying members. As part of this commitment, Elektor has launched Premium, an initiative that offers exclusive online articles to members sometimes even before they appear in the magazine.
Every day, members can access in-depth articles that showcase the best of Elektor's premium content.
This initiative aims to reward members with early access. Once logged in, members can easily enjoy this exclusive content and engage in discussions about featured projects. While Premium adds to the existing resources available, Elektor will continue to provide a wealth of free information.
Join the Elektor community today to take advantage of Premium and other benefits!
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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 the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
Extra info / Update
- 70 mm tall 7-segment displays
- Maximum total displayed: 9999.99
- Single switch operation using rotary encoder with press-button function
- Connections and operating control can be mounted on either the right or left-hand side of the PCB
- Controller: ATMega168-20PU
- ISP adapter for programming
- Power supply using 12 V / 800 mA mains adapter
Component list
(all 0.25W, 5%)
R1 = 220O
R2-R8 = 150O
R9 = 10kO
Capacitors
C1 = 330nF, ceramic, lead pitch 5mm
C2 = 10µF 16V
C3-C8 = 100nF, ceramic, lead pitch 5mm
Semiconductors
D1 = 1N5817 (Schottky diode, 1A)
IC1 = LM7805 (TO220 case)
IC2,IC3 = L293DNE, DIP16 case (Farnell # 1470423)
IC4 = ULN2803A, DIP18 case (Farnell # 1047761)
IC5 = 74HCT238, DIP16 case (Farnell # 382231)
IC6 = ATmega168-20PU, DIP28 case, programmed, Elektor SHOP # 080396-41
IC7 = PCF8583P, DIP8 case (Farnell # 403908)
LD1-LD6 = SA23-12SRWA (Kingbright), 7-segment LED display, red, common anode (Farnell # 1168639)
Miscellaneous
X1,X2 = 32768 Hz quartz crystal, cylindrical housing 3x8mm
K1,K2 (optional) = mains adapter connectors for PCB mounting
K3 = 6-way DIL pinheader, lead pitch 2.54 mm (Farnell # 1096984)
S1,S2 (optional) = EC11B15242 (Alps), rotary encoder for front panel mounting, 11mm (Farnell #1191733)
PCB no. 080396-1 from the Elektor SHOP
Discussion (0 comments)