石榴姐

Pure Digital builds a random number generator with range setting

Overview

Using 4-digit digital tube,

Paired with CD4511 digital tube decoder.

The counter is a CD4518 decimal BCD counter.

Range setting uses DIP switch as input.

After the CD4077 XNOR gate and then through a series of AND gates, it is sent to the clear 0 end of the clear counter to complete a cycle.

The display range is set to 0~9999. Since it is an asynchronous reset, the actual range that can be used for lottery is 0~9998.

The top layer is not painted so that the bottom layer can be seen through the transparent FR4 front and show off my single-sided PCB technology.

The flying wires all have 30mil openings, and the top jumpers do not turn, making them very suitable for single panels.

The circuit board has a bug, requires flying wires, and is not easy to start vibrating. It needs to be modified.

Appreciation of welding finished products

Front bare board

Back bare board

Appreciation of patches

Finished product

Because the circuit board has bugs, one of the videos below is a single panel made in school. The back is not shown. It is so rusty that it turns black.

Design Files

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Update:2024-11-14 23:44:50

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