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RK Education 4 Siren Sound Generator Kit

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This project PCB has been specifically designed to use the UM3561 siren generator chip and is great for integrating into models.

  • A low cost method of producing emergency vehicle siren sounds
  • Perfect for models
  • Produces 4 different siren sounds
  • The siren sounds are selected by moving a PCB jumper
  • The pitch of the siren can be varied
  • Battery powered
  • Uses a high quality speaker
  • Manufactured using a double-sided professional PCB
  • The PCB has mounting holes
  • The PCB has a clear white silkscreen layer
  • Compact design

Component List
PWR – for battery clip, ensure correct polarity, the holes either side can be used to thread the battery clip leads
J1 - 2 way header (SEL2)
J2 - 3 way header (SEL1)
C2 – 10μF electrolytic capacitor
C4 – 100nF multilayer ceramic capacitor
D1 – 1N400x diode
D2 – 3.3V zener diode
LS1 – Speaker, attached using flying leads
R1 – 100kΩ resistor (brown, black, yellow)
R2, R3 – 1kΩ resistor (brown, black, red)
R4 – 47Ω (yellow, violet, black)
RV1 – Variable resistor
SW1 – Ultra miniature slide switch
T1 – MPSA13 transistor
U1 – 8 way DIP socket with UM3561
When constructing PCBs it is advisable to start with the components with the lowest profile, for example resistors, and end with the components with the highest profile, for example capacitors.
It will be necessary to attach wires or speaker cables to the speaker. The speaker should be connected to the PCB by soldering the speaker wires to LS1. Extra pads have been included for greater flexibility. Normally the 2 pads in the centre should be used.
Connecting Power
The power is connected to the PCB pads marked PWR. The 0V input, usually black, is put in the right hand terminal and the +VE, usually red, is put in the left hand terminal. A 9V battery should be used. A power switch is included and is labelled SW1. Alternative switches can be used. If a switch is not needed, a shorting link will need to be used in place of the switch.
Using the PCB
When powered, and if the PCB has been constructed correctly, the siren will sound. By changing the position of the jumpers the sound of the siren will change, there are 4 different sirens.
The pitch of the siren can be varied by adjusting the variable resistor RV1.

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