RS-232 POWER TEMPERATURE SENSOR CIRCUIT DIAGRAM

RS-232 POWER TEMPERATURE SENSOR CIRCUIT DIAGRAMThe temperature sensor converts this temperature into a square wave with a frequency proportional to the absolute temperature of its package, while drawing little supply current from the power source. The amplitude of the output signal is equal to the power supply of the chip, and must be sent over a cable to the host system. The use of a RS-232 interface, low-power dedicated chip enables the communication, while providing power to the sens [...]

ROOM TEMPERATURE CONTROLLER USING LM35 SCHEMATIC DIAGRAM

ROOM TEMPERATURE CONTROLLER USING LM35 SCHEMATIC DIAGRAMWhen the temperature on IC LM35 is low, the output voltage also low. If the electric voltage of the transistor is below the transistor active area, the voltage will be blocked, LED will off, relay for the fan circuit in open condition, thus the fan is off.When the temperature of LM35 is high, the output voltage is also high. If the transistor electric voltage in the transistor’s active area, the LED will on, relay on the fan in close condition, [...]

PHONE CONVERSATION RECORDER SCHEMATIC DIAGRAM

PHONE CONVERSATION RECORDER SCHEMATIC DIAGRAMD1-D4 diodes serves as a device to convert the alternating current from the telephone line to become direct current in order to be used as a voltage activator. 12V zener diode lowers the voltage to 12V. When the phone receiver has not been appointed, the T1 voltage value will be low. This causes the transistor T2 on its cut off state and deactivate the relay. If the phone receiver is picked up, the voltage flows from T1 to T2. This activates the relay [...]

MAGNETIC SENSOR SCHEMATIC CIRCUIT DIAGRAM

MAGNETIC SENSOR SCHEMATIC CIRCUIT DIAGRAMThe principle of this circuit is, whenever a magnet comes close to the sensor, then the sensor will flow the output voltage to IC1. The output voltage will activate the timer which will then activate the relay controlled by IC2.Component List :Diode D1 : 1N4001Resistor R1 : 10k ohmResistor R2 : 470k ohmResistor R3 : 1k ohmResistor R4 : 47k ohmPolar capacitor C1 : 2.2 uF/16VPolar capacitor C2 : 470 uF/16VTransistor T1 : SL100IC1 : NE555IC2 : CD4013Relay RL1 [...]

LOCAL TELEPHONE LINE WITH DIVERTING SWITCH CIRCUIT SCHEMATIC DIAGRAM

LOCAL TELEPHONE LINE WITH DIVERTING SWITCH CIRCUIT SCHEMATIC DIAGRAMIn normal state, telephone no.1 and telephone no.2 can be used as an intercom when telephone no.3 is connected with the phone cable. To be used as an intercom, pick up telephone no.1 and push switch S1, then piezo buzzer 2 will sound, and so on.Components :Resistor R1 : 4.7k ohmPolar capacitor C1 : 2.2uF/100VPZ1-PZ3 : Piezo buzzerS1-S2 : Push buttonS3 : ON/OFF stereo switch12V DC/200 mA power sup [...]

HEADPHONE CIRCUIT FOR FIXED TELEPHONE LINE SCHEMATIC DIAGRAM

HEADPHONE CIRCUIT FOR FIXED TELEPHONE LINE SCHEMATIC DIAGRAMThis circuit requires low power, therefore can be installed parallel with the telephone. Transistor T1, Resistor R2,R3, and Zener diode are used to lower the input voltage become 5V. Transistor T2, resistor R6,R7, and capacitor C5 are used as the sound amplifier. This circuit is equipped with condenser microphone to speak and earphone to he [...]

DIGITAL VOLUME CONTROL SCHEMATIC DIAGRAM

DIGITAL VOLUME CONTROL SCHEMATIC DIAGRAMIt uses one IC DS1669 and some additional components. S1 works as an addition to audio volume, S2 works as audio volume subtractor.Components list :Capacitor C1 : 0.1 uFSwitch S1-S2 : Push buttonIC : DS16695V DC power sup [...]