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Here is electronic project of Simple Electronic Door Buzzer has a very simple function and is very easy to build.  This door buzzer circuit use a LF351 operational amplifier and other few common electronic components.  When the S1 push-button is depressed an initial positive voltage is placed on the C2 and the non-inverting terminal of the LF351 operational amplifier and the circuit will oscillate at a low frequency. Simple Electronic Door Buzzer Circuit Diagram: The used speaker for this project must have a impedance between 40 -80 ohms.  The door buzzer electronic circuit needs to be powered using a 9 volts DC power supply.

If you want to make a flasher unit for you motorbike then this circuit is just for you. This simple turn signal flasher circuit can be  easily built and installed in any two wheelers for the desired actions. The circuit employs just two 2-pins instead of 3 as found in other flasher circuits. Once installed, the circuit will faithfully flash the side indicator lights whenever the intended function is switched ON. The circuit also incorporates an optional buzzer circuit which can be also included for getting a beeping sound in response to the flashing of the lamps. . Parts List R1, R2, R3 = 10K R4= 33K T1 = D1351, T2 = BC547, T3 = BC557, C1, C2 = 33uF.25V L1 = Buzzer Coil

If you want to make a flasher unit for you motorbike then this circuit is just for you. This simple turn signal flasher circuit can be  easily built and installed in any two wheelers for the desired actions. The circuit employs just two 2-pins instead of 3 as found in other flasher circuits. Once installed, the circuit will faithfully flash the side indicator lights whenever the intended function is switched ON. The circuit also incorporates an optional buzzer circuit which can be also included for getting a beeping sound in response to the flashing of the lamps. Parts List R1, R2, R3 = 10K R4= 33K T1 = D1351, T2 = BC547, T3 = BC557, C1, C2 = 33uF.25V L1 = Buzzer Coil