Electronic Die


Posted on Feb 4, 2014

The simplicity of a traditional die makes it exceptionally difficult to create a fully equivalent electronic version, if only because an electronic version requires a power supply and a collection of electronic components that occupy a much larger volume than a normal die. This article describes an electronic die that can be built using normal com


Electronic Die
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ponents or SMDs as desired, and which comes very close to having the same format as a traditional die in the latter case. Despite its simplicity, this electronic die incorporates several interesting features. For instance, the range of spots` can be increased from 1 6 to 0 9 using a jumper, and it has standby function that disables the display approximately 8 seconds after the die has been thrown`, in order to save energy. The electronic die also uses energy efficiently by driving the display in pulsed mode. As a result of the latter two features, the current consumption of the circuit is approximately 25 mA in use and 12 mA in standby. This means that it can easily be powered by a 9-V battery. The circuit consists of the following parts: a free-running oscillator (IC1a), additional logic for driving the display (IC1c & IC1d), a timer (IC1b), a counter (IC3) and a display decoder (IC2). The oscillator is very simple. Its frequency, which is determined by R1 and C1, is approximately 225 Hz, with a duty cycle of around 50 60 percent. The signal from the oscillator acts as a clock signal for the counter (via R2) and a blanking signal for the display decoder (via IC1d). However, the counter will not count as long as the throw` switch (S1) remains closed, since the clock input of IC3 is grounded by S1. The blanking input of the display decoder is driven by a pulse waveform, so the display is in principle illuminated only around...




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