Timer with buzzer and optocoupler circuit


Posted on Feb 7, 2014

A small circuit that can find a lot applications of measurement time. She has the possibility us inform with sound signal from the BZ1. At the same time, exist the possibility drive a external circuit via the optocoupler IC2, after we connect the applicable circuit in contacts [ A ] and [ B ]. The circuit is based on IC1 (4060), which include in h


Timer with buzzer and optocoupler circuit
Click here to download the full size of the above Circuit.

is inside, oscillator and a binary divider of 14 stage. The frequency operation of oscillator is determined by a circuit R-C that connected in pins 9, 10, 11 of IC1. We give supply in the circuit, with switch S1, is presented a pulse in 12 [ RESET ] via C1 and R3, null him counter, require the measurement of pulses to begin from the zero. Than the count get at in 14th digit then exit Q14 in the pin 3, acquire high logic level. This voltage drive the base the Q1-2, the transistors turn on, thus buzzer BZ1 sound, also the IC2 is ready to drive, via contacts [ A][B ], any suitable external circuit. The time delay is regulated with the potesometer RV1, in time delay that begin from 1 minute up to 2 hours, proportionally with the combination of prices that they will have the RV1 and C2. [ see Table ]. The circuit can be supplied from a battery 9V or from external supply. Led D1 and R4, we can him cut out, they do not affect the circuit, simply us it show that the circuit work. The requirement in current when the circuit make time count, are not big (1mA roughly), with the D1 in circuit, on the contrary when activated output Q14, then the requirements in current boost, proportionally the materials that are activated [ D1, BZ1, IC1 ], reaching roughly 40mA.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Transformerless PSU
    Digital Up / Down Counter
    Active Power Factor Correction Circuit
    Light control system of traffic of double mode of infrared remote-control on the basis of 89C52 one-chip computer
    UC3906 battery charger controller circuit
    LM3551 LM3552 led driver schematic circuit design
    SPI-Flash Programmer 3.7
    TDS9092 TDS971 IEEE-488/RS232C
    Four-Digit Keypad-Operated Switch
    Amplifier Timer Circuit Schematic
    EMF sensor circuit diagram
    4 ~ 20mA transmitter circuit diagram TMP35 temperature
    Adjustable output MAX761 boost power supply
    555 direct reading frequency meter schematic



    Top