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Realistic POLICE SIREN KIT Runs on 6 to 12 volts. Drives any speaker. Two volume levels, 250 mW and 5 Watts. 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 Realistic POLICE SIREN KIT Runs on 6 to 12 volts. Drives any speaker. Two volume levels, 250 mW and 5 Watts. 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, ...

SM3 2 SM3 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" down in frequency. You'll find plenty of uses for the SM3. Kids love to play fire truck or ambulance on their bikes and wagons (Mom will appreciate the low volume setting here!) and there are the obvious uses for alarms and alerting. PARTS LIST FOR THE SM3 1 .01 or .02 uf disc capacitor [if .01: marked ...

SM3 3 SM3 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: Carefully select the right part and insert it in the PC board. Gently press it fully down to the board surface. Solder the lead wires and don't be afraid of using too much heat for a good solid connection. Clip or trim off the excess component lead wire. SM3 parts layout ASSEMBLING THE SM3 Installing and soldering ...

SM3 4 SM3 4 1. Orient the PC board as shown in the parts layout diagram with the five larger "pad" areas in a row along the bottom. 2. Install C2, 47 uF. Observe polarity. Electrolytic capacitors have polarity markings. Generally, capacitors will indicate the with a black stripe or arrow, while PC boards will usually show the hole. 3. Install R2, 47K (yellow-violet-orange). 4. Install C1, .01 or .02 uF. The holes for C2 are spaced far apart (you'll see why later) so just stretch C1's leads to fit. 5. Install R1, 47K (yellow-violet-orange). 6. Install Q1, green power transistor. The metal back-side ...

SM3 5 SM3 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. Pushbutton switch. A doorbell button works well, but simply touching two wires together will do. 1. Connect up the speaker to points 1 and 2. 2. Connect your pushbutton (or wires to touch) between point 4 and point 3 (the power connection). 3. Connect power to point 3 and ground to point 5. 4. Depress the button and you'll hear the characteristic upward ...

SM3 6 SM3 6 MODIFICATIONS HIGHER VOLUME: To increase the volume level, we add a resistor in series with C1 (that's why we have the holes spaced farther apart!) Simply unsolder one end of C1 and connect to R3, 1.5K (brown-green-red) as shown: YELPING SIREN: To make your siren sound like the yelping type (and get a tired pushbutton finger, too!), change 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 a pair! ...

Our catalog is loaded with lots of fun kits that you can build, from FM Stereo ... Our catalog is loaded with lots of fun kits that you can build, from FM Stereo ...

BEFORE assembling your kit. All Ramsey kits will work if assembled properly. The ... . All our kit parts carry the Ramsey Electronics Warranty that they are free from ... . 3. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics ... factory repair, kits MUST: 1. NOT be assembled with acid ... battery packs and the like. Ramsey Electronics, Inc., reserves the right to refuse ... customers in such situations, Ramsey Electronics, Inc., reserves the right to solve their ... BEFORE assembling your kit. All Ramsey kits will work if assembled properly. The ... . All our kit parts carry the Ramsey Electronics Warranty that they are free from ... . 3. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics ... factory repair, kits MUST: 1. NOT be assembled with acid ... battery packs and the like. Ramsey Electronics, Inc., reserves the right to refuse ...

Published by Ramsey Electronics, Inc. Copyright 1994 All rights ... reserved. Ramsey Electronics, Inc. 793 Canning Parkway Victor, NY ... full line catalog! RAMSEY TRANSMITTER KITS FM-10A FM Stereo Transmitter FM-1,2,4,5 ... Telephone Transmitter RAMSEY RECEIVER KITS FR-1 FM Broadcast Receiver AR-1 ... Converter RAMSEY AMATEUR RADIO KITS FX Series VHF and UHF Transceivers HR ... QRP Power Amplifiers RAMSEY HOBBY KITS SG-7 Personal Speed Radar SS-70 Speech ... full line catalog! RAMSEY TRANSMITTER KITS FM-10A FM Stereo Transmitter FM-1,2,4,5 ... Telephone Transmitter RAMSEY RECEIVER KITS FR-1 FM Broadcast Receiver AR-1 ... SC-1 Shortwave Converter RAMSEY HOBBY KITS SG-7 Personal Speed Radar SS-70 Speech ... DTMF Tone Grabber RAMSEY AMATEUR RADIO KITS FX Series VHF and UHF Transceivers HR ... 0.3 hrs Published by Ramsey Electronics, Inc. Copyright 1994 All rights ...