I need someone to make a ultrasonic dog barking machine. the joined leads of the pot can go to the positive line or to the 10k that's not critical…because pots don't have polarity. It is simply based on using the echo. BC547 can be used in place of 2907 but for the output transistor you will have to employ a power transistor such as D313, D1315 or TIP31, TIP122 etc. The whole unit must be installed inside a plastic enclosure made by fabricating plastic pipes in such away that it resembles a pistol kind of appearance with S4 positioned at the trigger button position. Without the base connected I get a very slow freq. The above integration results in an high frequency sweeping voltage at pin#3 of the right hand IC which is fed to the transistor current amplifier stage consisting of the power transistor  D40D5 or any other similar NPN equivalent. sorry, presently I do not have it, will update it whenever I happen to find it. Dear Stan, the circuit will produce a sharp penetrating noise which will cause a painful irritation to the ears. Or to increase the area, the same plot is connected to a stronger amplifier. Simple Ultrasonic Wave Generator. The ultrasonic receiver is a device that can detect sound waves that are normally beyond the range of human hearing, and then translate this signal to audible frequencies. The supply voltage is 15VDC I have swapped the 555 numerous times with other IC’s, but symptoms are identical. When I connect the base the base voltage falls to zero. Hi …the transistor is not critical, you can try any suitable 2 to 5 amp NPN transistor such as BD139, TIP31, D1351, D880 etc. The IC 555 at the right is wired up as a high frequency generator determined by the 1.5k resistor, P2 and the 0.01uF capacitor. Sorry I do not have anybody in Philippines who can provide you the kits. Advise which transmitter and receiver I should purchase for your LONG RANGE USW project, I have all the rest of the components except he TRANSMITTER and RECEIVER Modules. what are the specifications? I have all the components on a bread board and I have a feeling that this is where I've made fault. If you have any circuit related query, you may interact through comments, I'll be most happy to help! During their two Wireless Discovery Days, Avnet Silica would like to give you an update on the lates, Altium is pleased to offer free weekly webinars that cover basic and advanced challenges that design. Last Updated on November 7, 2019 by Swagatam 80 Comments. the distance will depend on the transmitter/receiver power and range, Sir, would increasing the number of these increase the range to say 300 ft for a defense also is the output below the human hearing range and if it hits an obstruction would it neutralize the effect. how many amps?how many watts? On the R/H 555 PIN 3 the frequency is 11-17 kHz & switches on/off as per the timing on L/H IC PIN 3 signal. Regards Jan. Hi Jan, I had referred this diagram from another site, and it seems the left side astable is incorrectly shown with pin6/2 connected with the base of 2N2222. This is to use it to chase away rats (and the occasional dog) which come in from the fields, so the frequency should also be above the human threshold of say 17kHz. make sure they are capable of handling upto 500mA current, JC, I WILL LIKE U TO SHARE IDEAS WITH US ABOUT SELF DEFENCE TOOLS THAT WILL BE LEGAL TO CARRY AROUND OR KEEP AT HOME IN THIS UNSAVE WORLD.THANKS. cause that's what the salesgirl keep asking me!!! Ultrasonic Sensor HC-SR04 with Arduino Code for Ranging TestC/C++ Write your code in Arduino IDE Software, save it. It sends an ultrasonic wave (sound … Another answer to generating ultrasonic frequencies is to ditch the Arduino altogether - use a 555 timer circuit (for lower range frequency, probably up to low mHz), or a resonator. An ultrasonic distance measurement is a non-contact distance ranging technique. The Ultrasonic Sensor is able of transmitting and receiving ultrasonic waves. Since we humans cannot hear whether the circuit is active, an LED makes the operation of the circuit visible. Please enter your email address. The inductor is 1000 micro Henrys right? Dear Sir If I want to use this circuit to drive a, say 4 or 8 Ohm speaker, can I just use the the BD139 to do so and use a 12V supply? It is very common to find this type of sensor in today’s cars. alternating between 2 & 3V from the IC. which is 8 ohms, the primary or the secondary? Does a free compiler have the guarantee and techni... i would guess there will be some projects comming... Toochain uses a GCC, so it is free and has all opt... Elektor is a great international source of essential electronic engineering information and innovative solutions for engineers, pro makers, startups, and the companies seeking to engage them. you can buy an ordinary audio transformer and use its output winding (speaker side) with the above circuit….the winding which has higher number of turns. (in case its a transformer) how many volts is the primary? What kind of sound are you getting presently? Explore 69 projects tagged with 'ultrasonic'. So we added a BS170 MOSFET as a driver stage for the MPT-001 tweeter from Monacor. Hi sir! The length of the pulse is proportional to the time it took for the transmitted signal to be detected. A battery pack made from chargeable Ni-Cd cells suits good enough for this ultrasonic weapon application. A simple version can be witnessed below which incorporates a couple IC 555s for the intended actions. the piezo which am referring to should look like this: 4.bp.blogspot.com/-MlUEEIZ2MDw/T5zHauzOS1I/AAAAAAAABNE/IsnTWGcUfkE/s1600/piezo+transducer+element.png, Can I use a 12v piezo buzzer which looks a lot like encased in black circle thing? when targeted toward the human attacker or an animal. It consists of two ultrasonic transducers: one that transmits 40 kHz ultrasonic sound … In this study, a design and implementation of a frequency generator … Got it working in the end, I disassembled it and rebuilt it again and managed to get it working.. must have missed something along the way. The piezo will need a special inductor and the piezo will need to be mounted or fixed over a specially design plastic enclosure, for generating a loud noise. Find these and other hardware projects on Arduino Project Hub. Dear Husmukh, yes you can try that, BD139 will work with a 8 ohm speaker at the mentioned frequency. A great option which can be as effective in such cases yet won't cross dangerous limits can be in the form of a USW or an ultrasonic weapon. If you continue to use this site we will assume that you are happy with it. Maxbotix produces MaxSonar-UT - unique ultrasonic generators in a pint-size plastic casing designated for use in sonars of 38-42kHz. For the two parallel inductors, here we incorporate the primaries of an ordinary radio audio output driver transformers and the series inductor can be any type having the value of around 1000uH.