A connection block carrying binding posts is used at each point where the cable connects to the push button wires or to the annunciator. This may be home-made or purchased ready made, as desired.
Burglar Alarm Annunciators.
Although almost any annunciator may be used for open circuit burglar alarm work, they usually do not contain certain devices which are desirable in burglar alarm work.
In [Fig. 62] is shown a diagram of a burglar alarm annunciator, the view being schematic of the back board.
The references are as follows: A is the main alarm bell situated wherever desired and connected to the binding posts BB. The battery connection leading directly to the battery K is marked C and that leading to the contact spring is marked D. The cut-off switch E cuts off the battery while F is the constant ring switch. G is the upper bar and H the lower bar, while the letters JJ denote the indicating drops. The door and window springs are lettered S. At L is a switch which may be used to disconnect the entire burglar alarm system. Where it is desired to disconnect only a section at a time, the switch corresponding to the section is turned off the upper bar G and on to the lower bar H.
Fig. 62
Clock Alarm Circuit.
A diagram of the wiring and connections on the back board of all clock alarms is illustrated in [Fig. 63]. This diagram embodies the principles of the last described circuit, but includes the circuit of a clock-operated alarm.