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$ j�, Geneva
( %Use appropriate
*connectors, circuit *plugs into host *computer end, loopback
*on user end. Diodes
*are in loopback.� �
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""� "� iӡ � � � ��
|� ��+]"LEDs� �� � � �
�� ��( ��CMOS
*4051� �� � � �
� �9( �CMOS
*4024� �� � � �
� n � �( � o NE or LM
* 555� �� � � � ��
4( + 9V� �� � � � ��
Y� i�( e�+ 9V� �
(�"R� 8!�0# � �0� ""� � �"� " "� "� "� " z* �" 2� H� � � � ��
^ , n D( j -22k� �� � � � ��
� ( � H( � )180k� �� � � � ��
, /< T+h0.5 uf� �� � � � ^
� � �(� Exact values are NOT critical,
* larger cap or resistors slow
* LED sequencing. These values
* give 4 LEDs in about 2 seconds� �� � � � ��
n � ~ �( z �4,8� �� � � � ��
�( �($ �1� �� � � � ��
d3 tD( p414� �� � � � ��
d� t�)�16� �� � � � ��
T7dL(`82,7� �� � � � ��
T�d
)�3,6,7,8� �� � � � ��
� � � �( � �3� �� � � � ��
� � � �)%1� �� � � � ��
�i �r( �j9� �� � � � ��
�� ��)(9� �� � � � ��
�g �x( �h11� �� � � � ��
�� ��)"10� �� � � � ��
�g
x(h12� �� � � � ��
��
�)"11� �� � � � ��
� �%( �12� �� � � � ��
� �'+/15� �� � � � ��
� '*-14� �� � � � ��
(8)+/13� �� � � � E
G6��+ Any rectifier
*type diode that
*can handle LED
*current (10-25 ma)� �� � � � ��
� D � M( � E7� �� � � � ��
� 7 L( � 82,6� �� � � � U
���+�� A 16 pin socket can be used
* for the 555, leaving empty
*places to insert resistors
*
and capacitor� �� � � � c
����(�� Circuit can be built into a
* small box with modular jack (or * other connector) plate on front.� �
(�" jb�#" kb
"� �" ����" ����#� " ��� #��#� #��#�� �" �� � �" ����" ����#� " ��� #��#� #��#�� �" �� � �" ����" ����#� " ��� #��#� #��" ���� �" �� � �"'���"#���#� "�� #��#� #��"��� �"#� � � � � ��
�� ��( ��300�� �� � � � a
� '�( f-----------------------------------------------------------------------------------------------------
*rThis circuit is shareware: If you build it and find it useful and want to express your gratitude (or assuage your
*oguilt :-) then send $5 to John A. Daspit, Univ. Of Colorado LASP, C.B. 392, Boulder, Colo, 80309 3/22/93� �� � � � �� �
\ �
( ] LED Line/Jack Continuity Tester� �� � � �
��
(�$The upper 4 MSB of the 4051 are not
*)being used so 4 more LEDs could be added
*for other applications.� �� ��
