Radio pemancar empat transistor

The series follows below can be used as a transmitter to transmit power switch 5km. This circuit can radiate in a circular wave 5 km.

Transmission distance are excluded from this series because there are four types of PNP transistors and megaphones.To extend the transmission distance of more than 5km we can use the antenna as high as 20m.

In order to obtain satisfactory results of transmission, it must be careful in installing components and adjusted to the symbols.specifically for the transistors should be attached with a metal material so as not to burn.

Information:

• R1   :  Fixed restan 3K ohm
• R2   :  Fixed restan 500 Ohm 
• R3   :  Fixed restan 100 Ohm 
• Tr1  :  Transistor PNP Type 2SA 70
• Tr2  :  Transistor PNP Type 2SA 70
• Tr3  :  Transistor PNP Type OC70 
• Tr4  :  Transistor PNP Type OC71
• C1   :  Ceramic condenser 0,001 pF
• C2   :  Elektrolit Condenser 0,01 upF
• C3   ;  Trimer Condenser  200 pF
• C4   :  Variable condenser
• C5   :  Ceramic condenser 0,001 pF
• C6  :   Ceramic condenser 0,01 pF
• C7   :  Ceramic condenser 0,01 pF
• S     :  Switch
• B    :   Voltage 12V
• C    :   Spull oscilator
• T1   :  OT with 70 winding transformer with kokr 3cm, thickness 0.3mm wire
• M    :   Speaker

 After the series finished, prepare a radio receiver.