Timers & Controllers




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Two Digit 99 Seconds Count Down Switch

2 Digit 99 Seconds Count-down Timer circuit is based on PIC micro-controller, Projects has Relay on board to provide NO/NC contacts,time settings with help of on board push switches. Circuit work on 12V DC , it has on board 5V regulator. On board power led and timer output LED.


Classic Timer Using 555 and Solid State Relay

Classic Timer project can be used in all application requiring a timer of up-to 3 Minutes to operate or control any AC mains load of up-to 200 Watts.  This project is based on the Classic 555 Timer IC, triggering a TRIAC.  Input and Output is Optically Isolated.


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Long Duration Timer 

The  timer project can be used to switched ON/OFF any device after set time, this circuit can be used in lots of application like  switched ON/OFF Radio, TV, Fan, Pump, kitchen timer, the circuit describe here its unique in its own. Project has been designed around two CMOS IC CD4001 and CD4020.  Two gates of CD4001 make the oscillator and rest has been configured as flip-flop, BC547 transistor is to drive the Relay. Circuit is pretty simple, has jumpers to set the required time duration, Preset is to set the 1Hz oscillator. SW1 is to start the timer, SW2 Power on/off project. Relay output switch contacts can handle 230V AC @ 5Amps


Electronic Toggle Switch 

The Project works as electronic toggle switch. The circuit is based on CMOS CD4013 Flip Flop IC,The circuit has two stable states, ON and OFF. Once it is ON, it remains ON till you press the switch again. A short button press of a tactile switch SW1 latches the circuit ON and another toggles it back OFF.Relay switch contacts can handle high AC Voltage as well as High DC current, this makes the project suitable for application like ON/OFF Fan, Light, TV, Pump, DC Motor, any electronic project required electronic toggle operations and few other devices work on AC voltage up to 250V AC or DC current up to 5Amps.


Heat Activated Fan Controller Using LM35 & LM358 Op-Amp

Heat Activated Cooling Fan Controller Circuit: Heat activated cooling fan controller is a simple project which operates a Brush-less fan when the temperature in a particular area goes above a set point, when temperature return normal, fan automatically turns off. The project is built using LM358 Op-amp and LM35 temperature Sensor. Project required 12V DC supply and can drive 12V Fan. This project is useful in application like Heat sink temperature controller, PC, heat sensitive equipment, Power supply, Audio Amplifiers, Battery chargers, Oven.


LIGHT SENSITIVE SWITCH SINGAL TRANSISTOR (1)

Light Sensitive Switch Based On Single Transistor

Light Sensitive Switch is a simple project which operates a relay when light falls on the LDR.


Clap Switch (1)

Clap Switch ( Sound Activated Switch)

Clap switch/voice activated switch designed around op-amp,flip-flop, and popular 555 IC. switch is free from false triggering to turn on/off any appliance, you just have to clap twice. The sound of clap received by microphone, microphone changes the sound wave in electrical wave which is further amplify by op-amp. 555 timer IC act as mono stable multi vibrator then flip flop changes the state of output relay on every two clap.


10 EVENT PROGRAMABLE TIMER (2)

10 Event Programmable Timer , 10 Alarm In A Day Programmable Timer


Temperature Sensitive Switch (2)

Temperature Sensitive Switch

Temperature Sensitive Switch is a simple project which operates a relay when the temperature in a particular area goes above a set point.  This circuit is built using CA3140 Op-amp and NTC temperature Sensor.


DARK SENSITIVE SWITCH (2)

Dark Sensitive Switch Using CA3140 & Relay

Dark Sensitive Switch is a simple project which operates a relay when the light falling on the LDR goes below a set point.  This circuit is built using CA3140 Op-amp and can also be considered for use in energy saving application.


Light Sensitive Switch Using CA3140 (1)

Light Sensitive Switch Using CA3140 OP-AMP

Light Sensitive Switch is a simple project which operates a relay when the light falling on the LDR goes above a set point.


CYCLIC TIMER USING 555 (1)

Cyclic Timer Using 555  Timer IC & Relay

Cyclic Timer project can be used in all applications requiring a cyclic On/Off condition of the relay.  This circuit is ideal for use in flashing of a light bulb, buzzer or siren application.


DELAY ON TIMER USING BC547 TRANSITOR (1) 

Power On Delay Using BC547 Transistor

Power-ON Delay Switch which can be used in all applications requiring a delay during power-on from 10 seconds onwards.


60 Seconds Timer (2)

60 Seconds Timer Using 555 Timer Ic and Relay

60 Sec Timer kit can be used in all application requiring a delay of upto 60 Seconds.  The project is based on the Classic 555 Timer IC.


LIGHT OR DARK SENSITIVE SWITCH (1)

Light Or Dark Sensitive Switch Using OP Amp CA741

Light Or Dark Sensitive Switch circuit is a simple project which operates a relay when the light falling on the LDR goes below or goes above a set point.


1 to 100 Seconds Adjustable Timer (2)

1 To 100 Seconds Adjustable Timer Using 555 Timer with Reset Switch

1 Sec To 100 Sec Timer project can be used for all application requiring a delay of up to 100 Seconds.  The project is built around the popular 555 timer IC.


DIGITAL TOGGLE SWITCH (1)

Electronic Toggle ( Latch) Switch

Electronic Toggle Switch project can be used for switching On/Off application of home appliances like fan, light etc.