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4 ½ digit meter with LCD display

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Vermes

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The meter is based on a chip TC7129 and dedicated LCD. Scheme was taken from the layout sheet.



The board was designed in SprintLayout5. It was made for work in two different versions.



One – powered from 9V, the second version is powered from 5V (7660 system was used to supply the system from 5V voltage, also using the application from the TC7129 layout sheet).



LCD display was specialized for that system. There are two types of such a display: VIM-503 and JH63p. First of them is a product of Varitronix and the second is a Chinese product.



Link to original thread (useful attachment) – Miernik 4 1/2 cyfry z wyświetlaczem LCD
 

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