Tele-visage / Mustaqim Mustafa and Shah Rull Sulaiman

Mustafa, Mustaqim and Sulaiman, Shah Rull (2005) Tele-visage / Mustaqim Mustafa and Shah Rull Sulaiman. [Student Project] (Unpublished)


This circuit is combination between counter and opto coupler ICs, which can be used in any product, which used low voltage to light in the dark such as bell door and telephone. The low voltage from ring signal through bridge rectifier activates diode in opto coupler ICs. The pulses from opto coupler goes to SCR grounded, meanwhile the pulses signal goes to IC timer and generate loudspeaker to produce sound and in the same time turn on the SCR.. The lamp, which connected SCR. in series but in parallel with bridge rectifier, an output transform and IC timer, will turn the lamp on.


Edit Item
Edit Item


[thumbnail of 48090.PDF] Text

Download (157kB)

Digital Copy

Digital (fulltext) is available at:

Physical Copy

Physical status and holdings:
Item Status:
On Shelf

ID Number




Statistic details