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  • 21 x 4093 Circuit Projects

    Browse through a total of 21 4093 Circuit Projects.

    Opened Window or Door Alarm Economical circuit of an electronic alarm, notifies you when your door or window is open, is presented here. This circuit wired around the Quad 2-input NAND Schmitt trigger IC 4093 (IC1) can be powered from a standard 9V battery. Here, a normally-closed (N/C) push switch (S1) is used to monitor the door/window activity. For...
    Low Cost Door Sensor This compact and affordable door sensor mechanism uses a Hall-effect sensor fixed at the corner of the door frame and a standard bar magnet fixed on the door panel close to the Hall-effect sensor. When the door is opened, the magnet moves away from the sensor to generate a wake-up signal to the rest of the electronics. This...
    Flashing Lights Circuit This flashing lights circuit can be used as beacon. The assembly consists basically of two blinking steps that commands two light bulbs. With the help of P1 you can adjust the flashing frequency between some limits. There are 2 parts for the circuit, the second one works the same way as the other but with the help of a wire...
    Simple Water Detector Circuit This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes. It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for example an aqueous solution, then because of the rectification action of D1...
    IC 4093 Datasheet The CD4093B consists of four Schmitt-trigger circuits. Each circuit functions as a 2-input NAND gate with Schmitt-trigger action on both inputs. The gate switches at different points for positive and negative-going signals. The difference between the positive (VTa) and the negative voltage (VTb) isdefined as hysteresis voltage...
    Light Fence Security Beeper General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit. Working of this circuit is straight forward. In standby mode photo transistor T1 receives light from the...
    Low Current Flasher Circuit This is a low current flasher consumes only a few Micro amperes current and lights a high bright LED day and night for more than one year. This can be used in switch boards, key stand etc to locate them easily. Unlike other LED flashers, it uses the current from the capacitor to light the LED. With a 9 volt battery, the LED...
    Refrigerator Alarm Circuit Use this refrigerator alarm circuit to prevent leaving the fridge door open by sending out an alarm signal every time the door is left open for some time. The sensor of the alarm is an LDR. After a short delay, it triggers an alarm signal and keep the signal on until the door is shut close. When the light falls on the LDR, it...
    Plant Watering Monitor Circuit This plant watering monitor circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the moisture level is increasing. Adjusting R2 will allow the user to adapt the sensitivity of the circuit for different grounds, pots and probe types....
    Electronic Bicycle Horn Circuit This simple electronic bicycle horn circuit uses only one gate of a 4093 quad 2-input NAND Schmitt trigger, U1, conected in a simple, low frequency, square-wave oscillator circuit. The oscillator’s output, at pin 3, drives the gate of Q1. The drain of that FET drives a small horn speaker. Potentiometer R1 can be adjusted...
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