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Runs on 6 to 12 volts.
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Drives any speaker.
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Two volume levels, 250 mW and
5 Watts.
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Easy to build two transistor circuit
teaches too!
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Kids love it!
Duplicates the upward and downward wail of a police siren. Great for
alarms, kids toys, bikes, go-karts, etc. Easily built by all ages!
Realistic
POLICE
SIREN
KIT
Kit No. SM3
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Summary of Contents for Ramsey Electronics SM3
- Page 1 SIREN • Easy to build two transistor circuit teaches too! • Kids love it! Duplicates the upward and downward wail of a police siren. Great for alarms, kids toys, bikes, go-karts, etc. Easily built by all ages! Kit No. SM3...
- Page 2 INTRODUCTION TO THE SM3 The Ramsey SM3 will duplicate the sound of a police siren at a low (200 mw) or high (2 watts) volume depending upon construction. Closing a pushbutton switch will cause the siren to "wail" up in frequency and opening the button will cause it to "coast"...
- Page 3 ASSEMBLING THE SM3 Installing and soldering six parts on a small PC board doesn't seem like much of a task, but there is still the possibility for error, so follow our step-by-step directions and you'll be "wailing" real soon! When we say to install a part, we mean: •...
- Page 4 7. Install Q2, the black NPN transistor. Transistors always have to be installed in a certain way. Be sure you position the flat side as shown. 8. Check your work - especially the soldering. Let's hook it up! SM3—4...
- Page 5 TESTING THE SM3 For testing your SM3 you'll need: • A speaker with an impedance from 3 to 45 ohms. Any style will do, but a horn type will give the most volume. • Power source from 9 to 12 volts DC. A 9 volt battery will suffice for now.
- Page 6 C2 from 47 uF to a smaller value such as 5 or 10 uF. Experiment with different values for the right rate. You may find extra capacitors in old radios or other devices. If need be, you can even buy them new at Radio Shack for about 69 cents a pair! SM3—6...
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Page 7: Finishing Touches
• COUPLING THE AUDIO OUT TO A MICROPHONE INPUT: The SM3's audio can be easily coupled into a microphone input for a PA system or radio. You only need to simulate a speaker connected and add an audio coupling capacitor. Both parts are available at Radio Shack. - Page 8 SM3—8...
- Page 9 1. DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit, Before you conclude that a part may be bad, thoroughly check your work. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced promptly at our expense.
- Page 10 REQUIRED TOOLS • Soldering Iron Ramsey WLC100 • Thin Rosin Core Solder Ramsey RTS12 RAMSEY TRANSMITTER KITS TOTAL SOLDER POINTS • FM10A FM Stereo Transmitter • Needle Nose Pliers Ramsey MPP4 or • TV6 Television Transmitter RTS05 ESTIMATED ASSEMBLY RAMSEY RECEIVER KITS •...