Radio - Code lock.

                                          
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| CODE LOCK WITH CAPACITIVE MEMORY | #  
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For making a combination lock (SEE FIGURE) 
it will take a little                       
details. Electrolytic capacitors    
С1-СЗ can be type                     
K50-6, resistors R1-RZ-MLT-0.5, diodes       
D1-D4 - any silicon,                   
designed for a current of at least 3OmA and       
voltage of at least 40 V.                 
Kn1-Kn7 buttons and G1-G7 connectors - any, even 
model.Electro-                       
magnet (solenoid) Em1 must be with        
winding resistance                    
20-25 Ohm. It can be manufactured according to the description,
placed in the magazine                     
<> (197З,N8,с.ЗЗ). Electromagnet   
mechanically connected to                    
with the bolt of the lock or with the handle of its bolt.  
SCR D5 can be                   
type KU201V-KU201L or KU202V-KU202N.     
 <> of the lock are sequential
but connected capacitors C1-СЗ. Conclusions  
positive capacitor plates      
connected to coding sockets        
G1-GZ connectors to which it is supplied          
constant voltage from the divider R2RЗ.    
The <> voltage is supplied through     
diode D1 and contacts of the button included in   
G4 connector socket, to the control        
SCR electrode.                      
 The code is four-digit, and in this case    
it corresponds to the number 12З4, but maybe 
and others, 526З or З152. First digit of the code 
must match the button number,     
connected to the socket of connector G1, second  
G2, third GZ, etc. To open the door  
you need to press the buttons in the order installed - 
nom code. So, for shown in the diagram  
code first you need to press the button Kn1.      
A current pulse will pass through the capacitors  
and capacitor C1 will be charged to   
voltage approximately equal to 80-85%        
voltage taken from resistor RЗ.     
When you press the Kn2 button to this          
voltage will be charged and the capacitor    
C2, and when you press the button KnZ will charge     
capacitor SZ. Charged capacitors    
are original sources        
voltages connected in series,    
therefore the total voltage measured       
between the positive condenser plate -   
torus C1 and negative facing         
The capacitor SZ will be approximately 2.7      
times more than the voltage removed from       
resistor RЗ. When the last one is pressed      
code buttons (CNC) this voltage will be    
attached to the control electrode        
SCR D5. It will open and connect    
electromagnet winding Em1 k              
power supply. The door lock will be       
open.                                   
When opening the door, I open-      
existent contacts of switch B1,         
installed on it will relieve tension  
power supply from the code device, and the circuit-     
penitent contacts will discharge the capacitors   
C1-SZ through diodes D2-D4 and resistor R1.    
When closing the door, code device   
will take its original position.                
 If the sequence of pressing the code is    
the output buttons were broken, capacitors     
will charge up tovoltage, insufficient      
to open the SCR, and the door         
will remain closed. When typing      
code press one of the non-code buttons    
(in this case KhS-Kn7), capacitors    
<> will be discharged through diodes D2-D4   
both resistor R1 and the lock will not work.       
 To power the encoding device, you can    
use any rectifier,           
providing a voltage of 40V at current    
up to 2 A.                                   
 Setting up the device comes down to        
selection of resistor R2. Temporarily instead of non-  
connect a variable resistor         
resistance 1 OkOhm. Rotation of the slider     
resistor sets this voltage  
on resistor RЗ, so that the total voltage -  
on capacitors C1-SZ with correct 
typing the code was a little more stressful -  
opening the SCR. At the same time   
when you press only two buttons, the code for this 
the voltage should not be enough for   
opening the trinistor. Having selected the required one - 
Xia mode, measure the resulting resistance   
installation of a variable resistor and installation -  
insert a constant resistor into the device with   
with the same resistance.                  

















                                          
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             |                    |       
             | Автор:В.Сокольский |       
             | Текст писали:      |       
             | Алимов             |       
             |       Роман        |       
             | Юдин               |       
             |     Алексей        |       
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 ZX<Ьеst> company LTD.AiRSoft.            
                                          
                          In 2З.11.96.