e02ch08.pdf

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008

Modiﬁed Time Clock Switch

H. Steffes

switching off. Set the time ring to the Zero position and ﬁt the

tab at the desired switch-off time. A mechanical on/off switch

is used to start the time switch. After the set interval has

expired, the motor is de-energised and the time switch is thus

stopped.

Please bear in mind that you are working with the mains volt-

age. The device must still be safe to touch after the modiﬁca-

tion, and the switch must be a type that is suitable for use with

the mains voltage.

It doesn’t take a lot of effort to convert an electromechanical

time clock switch into a simple time switch, and it can be done

quite simply. All you have to do is open the case and discon-

nect the series resistor for the motor from the switch contact.

Next, use a length of insulated wire to reconnect it to the other

side of the switch contact. The difference between the two

versions is shown in the ﬁgure.

To operate the time switch, all that you need is a tab for

(024038-1)

26

Elektor Electronics

12/2002

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SMALL CIRCUITS COLLECTION

M

M

024038- 11

009

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