**Click on the Image for its larger version
����� ��� ������� ���� ������� , ��
�� ����� �������� �� ������ ������ ��� �������
������� ���� ������ ����������� ������� ���
������ ���������. �� ������� ���� ������,
������������� �� ������� ���������� 400 �� ��� ��
IC2, ���� ����� 3. ������� ���� ��� IC4, ����
���������� ���� ��� �����, ������� �� ���������
���� ������ ���� �������� ��� ��� ��������, ����
�� ������ ��� �����, �� ����� ������ �������. �
��������� ������ ���� ���������� ��� �� �������
TR1 �� ����� ��� ������� ������ �� ��������������
�� ��� ������������. �� ��� ����� Led LD1 ������
������ �������, ��� �������. ���������� ���� ���
IC3 ������ �� ����� �������, ���������� ����������
,������������� ���� ������� ��� ���� ������.
It is a relatively
simple circuit, with which we can have optical and sound clue, when we have telephone ring
in the line of telephone. The calls in the line, are changed in pulses of frequency 400 HZ
from the IC2, in exit 3. Then via the IC4, after they are strengthened at two times, they
can be drive to the entry of amplifier and a loudspeaker, so that we hear the ring, in
what level we want. The desirable level of sound is regulated by the trimmer TR1 that if
we want can be replaced with pontesometer. With the led LD1 we have optical clue, of
rings. Simultaneously via the IC3 it can become control, exterior circuit, adapted in the
needs each virtuous.
|
