R-Meter (Ohmmeter 0-1 MOhm, Wheatstone-Brücke mit 741)

The `brain` in the digital clock described in this article is the clock-IC MM5314, which needs only a few external components. The time of day is indicated by seven-segment Ga-As displays, which are now offered at quite agreeable prices. Another attractive feature is that if no seconds reading is included in the design, a considerable saving can be made, whilst seconds indication can always be added at a later stage.