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Beeper & Buzzer Circuits

 HIGH SOUND OUTPUT BEEPER CIRCUIT (7)   (beeper) I you need a real loud beeper, this circuit delivers about 110db (12 inches away) from a 9v battery using a single inexpensive C-MOS IC. An off-the-shelf piezoelectric beeping device is driven at resonance to insure maximum efficiency. By changing the control IC to a 74AC14, the same circuit can operate from 3v and 1.5v batteries. Published in Electronic Design, Aug 5, 1993 POWER REMINDER BEEPER:  (20) (beeper2) This circuit produces a short beep once each minute. It is powered directly off the 120vac power line to remind you that a device connected to the circuit is turned on. It is simple enough to be packaged inside a small plastic box. It might be ideal for computers, printers or some test equipment that shouldn't be left on all night. BASEMENT DOORBELL BEEPER (39)  (doorbell) If you can't hear your doorbell when you are in your basement try this circuit. This circuit takes advantage of the 24vac power source located near the furnace. Using a simple current transformer technique, the circuit sounds a beeper whenever the main door chime is activated. MACHINE POWER LOSS BEEPER: (40)  (powerlos) For some medical equipment it is important for an operator when power is lost to the machine. The beeper is powered from a 9v battery and requires the machine to have a power switch with a third set of contacts. VERY LOUD BEEPER CIRCUIT (51) (beeper3) This circuit is similar to circuit number 7, but generates a continuous tone instead of a pulsing one. The circuit delivers about 110db (12 inches away) from a 9v battery using a single inexpensive C-MOS IC. An off-the-shelf piezoelectric beeping device is driven at resonance to insure maximum efficiency. ANOTHER VERY LOUD PIEZO ALARM BEEPER (67) (beeper4) This is yet another beeper circuit that really draws attention. It sweeps the drive frequency slightly to produce a very annoying sound. It uses a transformer to increase the drive voltage across the piezoelectric device to more than 200 volts peak to peak. It cranks out an ear splitting 120db when measured at 12 inches.
 3 Tone Gong: Suitable for use as a door bell Bells Ring Generator: 3-Circuit options Can be synchronized to Christmas tree flashing lights Personal Alarm: Small portable, anti-bag-snatching unit.  Also suitable for Doors and windows control Police Siren: This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as astable multi vibrators. Speaking Doorbell: SpeDoB was designed and built to gain experience with the PIC microcontroller. This doorbell uses a speech recorder integrated circuit (ISD series) to play back3 pre-recorded "there's someone knocking on the door" messages. Its a very easy and simple project to build, ideal for beginners! Timed Beeper: Beeps 7.5 seconds after a preset Time Adjustable Time settings:15 sec.30 sec.1 min.2 min. & others Two Tone Generator: This two-tone generator includes 3 ICs - NE555 Astable Multi vibrators. You can vary the duration of each tone by changing the 10k resistor or 100MF capacitor at IC1 or changing resistors and capacitors at IC1/2 for higher or lower tone. You've got Mail Many e-mail programs provide a "beep" or a pop-up message box signaling the user that a new e-mail message has arrived. If you are too far from the computer to hear the audible signal or if the monitor is turned off, then you miss the new-mail audible and visual signals. The simple circuit in Figure1 latches on an LED and an audio sounder when an appropriate new audible e-mail signal occurs. The method replaces the normal e-mail sound. wave file with a .wav file of any valid recorded dual-tone multi frequency (DTMF) sound

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