The second method is to record (realtime) the actual bark in an analog CCD delay line (~100 msec FIFO) and upon recognition that the sound is a bark, the device plays back-through a loudspeaker-that last recorded 100 msec of bark. It really confuses them; they start shortening the number of their barks, until they often give up. It is funny t
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o watch/hear their initial confusion! 3) The third approach works well on cold winter nights when you can hear every dog in town, and so can your neighbors` dogs! It is continuous white noise played through a loudspeaker, toward the offending dog(s). This seems to "mask" the sounds that trigger the dog`s barking. Be careful however, because you could run afoul of your local noise ordinance-especially if your neighboring dog owner is "gunning" for you! * What type of pot core and winding -Actually, I used several pot cores stacked, such that the primaries were driven in parallel and the secondaries were connected in series-all phased correctly. This was done as a quick & dirty way of achieving a "step up" and allow for enough power-before core saturation. The specific pot core specs are only important relative to optimum operating frequency: ~10 kHz to ~40 Khz, peaking at ~ 20 kHz. However, this is not critical due to the broadband nature of ferrite transformers. One could use alternate transformer technology: single large ferrite torrid. * What is the freq range of the circuit (and a dogs ultrasonic hearing range, for that matter) -I have typically used a frequency above the human range ~ 20 kHz. Dogs seem to respond to almost any frequency up to 30 kHz (and maybe above). My main intent was to not attract the owner`s attention, but use enough power & directivity to get the animal`s attention!
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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