Radio - Improved Caller ID.

                                          
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 | Refinement of Caller ID on the Z-80 | #           
  +-----------------------+ #           
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With all the undoubted conveniences of Caller ID on     
Z-80 has a significant drawback:   
with sharp fluctuations and voltage supply 
The processor does not reset the mains supply -   
is, as a result often on     
electronic dialing key or sub-  
When the handset is turned on, the logical level is supplied 
coy 1, and the telephone line turns out      
closed. And this, in turn, will entail   
disabling the subscriber's telephone line on   
PBX.                                      
 The described device (SEE FIGURE), made -  
in the form of a prefix, allows you to resolve -  
solve this problem. The principle of operation is -  
rates are based on the following feature    
Caller ID: if the finger processor fails -  
no need to regenerate the display (this is   
visible by appearing in the first digit    
digits 8) and at the outputs of the decoder         
K555IDH display pulses disappear. Because of  
their absence is no longer reset      
DD2 counter. To the counting input of the counter     
pulses are received from the generator, assembled -  
on elements DD1.1 and DD1.2.         
 After a whiletime depending on the capacitance 
capacitor C2 resistance and resistance 
side R2, at the output of element DD1.3 appears -  
is the level of logical 0, which     
resets the processor. Starts to work    
display, and the DD2 counter is set to    
initial state until the next failure.    
The optimal counting time is 10 ... 15 s.    
 The set-top box microcircuits receive power from 
Caller ID. Diode VD1 can be any silicon  
vy, for example, the KDS21 or KD5OZ series.     
Capacitors - KM, resistors - MLT-0.125. 
Pins 12, 1З, and 14 of the DD1 microcircuit are as follows: 
cannot be connected to each other. circuit board 
with the details, the attachments are placed in their  
free place inside the telephone set.