Cheap siren with nand gate IC
This is a siren sound generator circuit. Which is less expensive and can create simple. The IC1 is using CD4011 (Digital Nand Gate) and the IC2 is CD4046. Operation of the circuit, IC1 is a clock frequency 1 Hz.(Frequency adjusted by the value of R1 and C1.) Then it pluse IC1 regtifier through diode D1 to charge slowly with the C2 control of R3. Then the C2 signal sends to IC2 at pin 9 (Control voltage input). For IC2, which acts VCO (Voltage Conrolled Oscillator).The frequency of the output voltage control. The frequency is changed by voltage and out to …
Two LED Flasher using Gate of IC 4011
IF you want the small circuit two LED Flasher, I show this circuit. The important part of the circuit is IC 4011 again, I used gate of IC 4011 (see image). IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 1Hz frequency. Two LEDs are flasher to alternate. To change value C1 and C2 for other flasher ratio. Detail more, Please read in this image circuit. See video to test this circuit on breadboard. From circuit below it lower light LED I think this circuit better. This simple circuit uses NAND Gates to alternately flash …