fig1 depicts the sonic collar sheep protector 10 , having a bright colored ( i . e . orange ) collar section with audio openings 11 , capable of emitting at least one of five different audio sounds from five different alarm patterns . the bright color of the collar serves as a marker and allows the herdsmen to reduce the cost of marker sheep ( black sheep ) needed in the flock . the inner surface 12 of the collar or neck bend is flat and engages the area of the sheep &# 39 ; s neck where a predator is likely to attack . one or more strobe lights 13 may be recessed , even with or protrude slightly from a visible section of the collar , which is sewn or otherwise attached to the collar , so as to allow the inclusion of a control circuit , strobe light circuit and audio alarm circuit . the u - shaped device is placed about the sheep &# 39 ; s neck and fastened by a nylon strap 14 . the unit is powered by a primary battery pack 6 to 12 volts ( v ) and a 3 volt flash battery pack . diode d2 prevents reverse polarity damage . the light sensor section serves as the power switch for the control circuitry . this consists of a low power , high output , comparator ic ( integrated circuit ), texas instruments tlc3702 . with this chip a reference voltage is applied to the plus input . a voltage divider circuit consisting of r4 , r5 gives us a reference voltage of when the voltage applied to the minus input is less then the reference at the plus input , the output is switched to ground . when the minus input voltage rises above the reference voltage ( plus input ), the output is switched to v +- 0 . 6 volts . it is important to note here that the voltage at the minus input is also a voltage divider circuit consisting of r3 , and a photo resistor in series with r2 . r2 serves to increase the resistance from supply to ground in order to reduce the current draw . as the light changes so does the resistance of the photo resistor and therefore the voltage at the minus input . with the circuit as described , there would be an oscillation problem at the switching point since the light change is not a linear curve , therefore , r1 is added for hysteresis . when the switching occurs , the value of the reference now changes and this prevents switching back due to minor changes in light . the shock sensor includes a piezo ceramic bender , such as part number db - 20pb by project unlimited or other suitable motion detectors , a 1 / 2 &# 34 ; pvc pipe cap , a 3 / 8 &# 34 ; stainless steel ball and resistors r7 and r8 . when the ceramic resonator is struck by the ball it induces a voltage across r7 and r8 . the ratio of these two resistors sets the sensitivity voltage . r6 is used for current limiting while di protects the transistors from reverse voltage breakdown . q1 will sort the shock sensor signal to ground during the 10 minute shut - down period . q2 with r10 ( pull - up resistor ) form an inverter for the 10 second timer input . the two timers consist of a 7556 ic ( a cmos version of a dual 555 timer ), r9 and c5 set the time constant for the 10 second timer , r17 and c4 set the time constant for the 10 minute timer , r19 and c9 set the time constant for the reset delay , this allows the circuitry to stabilize during turn - on at dusk before the timer is activated ( i . e . prevents false turn on ). to operate the timer , q2 ( normally high ) is pulled low by the signal from the shock sensor , this turns on the ten second timer ( i . e . pin 5 goes high ) which in turn turns on q9 and q3 which powers the alarm circuits . when q9 turns on , it pulls pins 8 ( 10 minute timer input ) low , and this turns on the 10 minute timer , which turns on q1 , thereby preventing another trigger for 10 minutes . resistors r11 , r20 , r22 , r21 , r16 are bias resistors for q1 , q9 , q3 respectively . r18 is a pull - up resistor for q9 and the 10 minute timer trigger . d3 prevents any current flow to the trigger during the shut - down period ( day light ). c14 helps to stabilize the power supply line during switching activity . the strobe circuit is switched by a relay since the high power draw ( 1 to 3 amps ) drops excessive power across a transistor or fet . a 6 to 1400 turn ratio transformer is used in a switching power supply made up by q15 , c16 , r40 , d6 , the transformer and a 330 volt , 120 uf electrolytic capacitor . this converts the 3 volt supply to 300 volts to drive the flash circuit . for a flash , c18 charges to 180 volts , though r41 ( time delay ) and the trigger coil ( this limited current is not enough to trigger the flash ). at 180 volts , q14 the sidac or a triac q14 ( triggered by a diac d8 and a zenor diode d7 as shown in fig4 ) turns on , this shorts the c18 charge through the trigger primary coil , yielding 1400 volts out of the secondary to trigger the exon bulb . once triggered the flash bulb will discharge the supply capacitor down to approximately 15 volts , at which time the process repeats . it is important to note here that the voltage converter is not perfect and cannot maintain a regulated 300 volts , and that the delay between flashes is do to the recovery time needed for the switching supply to bring the supply capacitor back up to about 200 volts needed to trigger the flash . the separate supply for the flash is due to the high power draw of the flash . if the flash pulls the batteries down too soon the rest of the unit including the audio alarm will still function . multiple alarms can be configured by minor part changes here . the basic blocks here are a vco ( voltage controlled oscillator ) consisting of q6 , q7 , r27 , r29 , r23 , r24 , r28 , d4 , c11 , c12 where c11 and c12 allow easy modification of frequency range . r32 prevents excessive loading of the oscillator from the amp . for the amplifier , a standard inverter ic is used to drive a push - pull transistor amplifier . for the vco input there is a saw tooth generator , consisting of q4 , q5 , r25 , r26 , r30 , r31 , c6 , c8 and c10 . r25 can be varied for frequency control . an alternative vco input is a square waver generator consisting of u1 , r12 , r13 , r14 , r15 and c2 . r12 and c2 set up the time constant to control the frequency . a voltage divider can also be used as the vco input , yielding a single frequency output . the pcb ( printed circuit board ) is laid out with jumpers to allow the various configurations . by inserting a jumper in the block marked &# 34 ; dc &# 34 ; the voltage divider input to the vco will be used , similarly for &# 34 ; saw &# 34 ; for the saw tooth generator , or &# 34 ; sq &# 34 ; for the square wave generator . also three different variations of the vco are available , use jumper block labeled 1 2 3 ; no jumper yields one sound , a jumper across 1 and 2 yields another , and a jumper across 2 and 3 yields yet another . this last sound is similar to a wolf call and is never used at this time . another option , the audio circuits is to use a complete dc audio alarm tied between the collector of q3 and ground . two such alarms have been approved so far , they are a xl - 980 or xl - 960 by project unlimited . the components used in the sonic collar sheep protector have been chosen with consideration to low power and low cost while yielding high performance , and this is to be borne in mind if substituting parts . the rc time constant parts for the 7556 should be low leakage and tight tolerance since this is stretching the timing limits of this chip . the light sensor is set to turn the power on at a lower light level than where it turns the power off , and this spread in light level is adjustable by changing r1 . the light trigger level is adjustable by changing the voltage divider to the minus input . the shock sensor sensitivity can be changed by adjusting the voltage divider consisting of r7 and r8 . d5 is necessary to short the voltage kick back form the relay coil and c15 is a filter capacitor . the battery ( s ) 15 , are enclosed in a mold hard plastic case 16 , that protrudes slightly outward from the collar in a manner so that it does not interfere with the sheep &# 39 ; s comfort when the collar is around its neck . a contact plate 17 , in each end of the case , and the plates are soldered to conductor wires while they frictionally engage the battery terminals so as to allow ease of battery replacement . while the invention has been described with reference to a u - shaped design , it is important to note that many changes in the design configuration can be made without departing from the scope and spirit of the invention , which is defined by the appended claims .
predator control sonic collar unit for protecting livestock when placed around the neck , comprising means for detecting startled motion , means for transforming the startled motion into an electrical impulse , and means for converting the electrical impulse into an audio alarm sound and / or visual alarm which repels an attacking predator .