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 [...]

DIGITAL COMBINATION LOCK CIRCUIT DIAGRAM

DIGITAL COMBINATION LOCK CIRCUIT DIAGRAMThe output of this circuit can be connected with relay as an ON/OFF control to the electronic devices. This circuit works with 5-12V power supply. To store the combination, connect the IC push button switch with the pin 3,4,5, and 6. For an example, S1 with pin 3, S2 to pin 4, S3 to pin 5, and S4 to pin 6. This will result 1234 combination. Connect S5-S8 with pin 2. This will cause to reset the IC if the combination is wrong. Relay will turn to active when [...]

DAILY WAKE UP CALL ALARM CIRCUIT SCHEMATIC DIAGRAM

DAILY WAKE UP CALL ALARM CIRCUIT SCHEMATIC DIAGRAMWhen the sensor doesn’t receive any light (night time), the transistor basis would have 1 (high) value, so the emitor value is 0 (low). The low value in the emitor would reset the IC timer. The circuit’s value would change when the sensor exposed by morning light. This condition would turn on the IC555 and produce sound on the speaker. Sensor sensitivity can be adjusted by turning the variable resistor to find the proper value.Components :Resistor [...]

CHRISTMAS STAR LAMP SCHEMATIC DIAGRAM

CHRISTMAS STAR LAMP SCHEMATIC DIAGRAMThe lamp will turn on from darkness into its maximum brightness and then goes back to dim. The lamp intensity is influenced by C3 capacitor. IC2 is an optoisolator, and IC1 acts as astable multivibrator. IC1 frequency can be changed by changing the values of R2 and C1.Components list :Diode D1-D5 : 1N4007DIAC : DB3Resistor R1 : 1k ohmR2 : 100k ohmR3-R4 : 10k ohmR5 : 270k ohmResistor variable VR1 : 1M ohmPolar capacitor C1 : 47uF/25 VCapacitor C2 : 0.01 uFPolar [...]

CHRISTMAS FLASHING LIGHT CIRCUIT

CHRISTMAS FLASHING LIGHT CIRCUITTriggering control of the SCR done by Q1, Q2, and related resistors. Timing depends on R1, R2, and C1. If you want to change the frequency, set the C1 value from 100uF to 2200uF instead of modifying the values of R1 and R2, because they already set for the proper current and voltage point. Best performances can be achieved with C1=470 or 1000µF and R4=12K or 10K. A number of 10 to 20 lamp in series for Christmas trees (60mA @ 220V typical for a 20 lamp series-loop) [...]

AUTOMATIC TRAFFIC CONTROL LDR SCHEMATIC DIAGRAM

AUTOMATIC TRAFFIC CONTROL LDR SCHEMATIC DIAGRAMWhen the light is dark (high resistance value of LDR), electric current is small. Since the electric current is small and it value less than the transistor’s active voltage, the electric current will be blocked, AC lamp circuit closes, and the light turns on. When the light is bright (low resistance LDR value), electric current is high. Since the electric current is high and its value is larger than the transistor’s active voltage, the electric current [...]

AUTOMATIC ROOM LIGHT SCHEMATIC DIAGRAM

AUTOMATIC ROOM LIGHT SCHEMATIC DIAGRAMThis circuit uses two LDR sensors put separately with 0.5m distance. Make sure to shut the LDR sensor tightly, in order not to be influenced by the light from outside. The output for this circuit is a 220V AC bulb lamp.Components :Diode D1-D4 : 1N4001Diode D5-D8 : 1N4007Diode D9-D10 : 1N4148Resistor R1,R3 : 33k ohmResistor R2,R4-R8,R10-R13,R15 : 10k ohmResistor R9 : 100 ohmResistor R14 : 470 ohmResistor variable VR1 : 100k ohmCapacitor C3-C4 : 0.01 uFPolar capacitor [...]

AUTOMATIC LDR LIGHT SCHEMATIC DIAGRAM

AUTOMATIC LDR LIGHT SCHEMATIC DIAGRAMSince the non-inverting reference frequency is higher than the inverting input voltage, the IC ouput value is ’1'. Transistor in ‘ON’ state, relay is also ‘ON’, thus the AC light will be close and the light turns on.When it’s bright or the resistor value of LDR is low, the current is high. Since the inverting input voltage is higher than the non inverting reference voltage, the IC output is ’0', transistor in ‘OFF’ state, thus the AC open and the light turns [...]

AUDIO FREQUENCY LIGHT MODULATOR SCHEMATIC DIAGRAM

AUDIO FREQUENCY LIGHT MODULATOR SCHEMATIC DIAGRAMThe distance between receiver and transmitter circuit depends on the environment. Light has function to replace cable from audio source to speaker. Transformer X2 is utilized to lock the audio signal. VR1 works as the amplitudo modulator from the T1 signal output.Parts list : Resistor R1: 47k ohm Resistor R2 : 22k ohm Resistor R3 : 220 ohm Diode D1-D7 : 1N4001 VR1 : 1k ohm Polar capacitor C1 : 470 uF/25V Polar capacitor C2 : [...]

METAL DETECTOR SCHEMATIC USING BEAT FREQUENCY OSCILLATOR CIRCUIT DIAGRAM

METAL DETECTOR SCHEMATIC USING BEAT FREQUENCY OSCILLATOR CIRCUIT DIAGRAMSchematic Diagram of The Metal Detector Circuit,Metal detecting with beat frequency oscillator is one of the simplest method. The circuit basically have two balanced oscillators. The first provides the reference signal, and the other acts as the detector element. The frequency for the reference is fix, and the other one varies depending on the presence of a metal. This reference oscillator can be built using various circuit [...]

SCANTOOL OBD-II INTREPRETER MODULE

ScanTool OBD-II Intrepreter Module in a DIP-24 PackagemicroOBD 200 (#440101) is a complete OBD?II interface in a vibration-resistant DIP-24 module. The only product of its kind, it offers engineers a simple and inexpensive way to add OBD-II support to any embedded project and tap into the wealth of information available on the vehicle’s communication bus. The interface is fully compatible with the popular ELM327 command set and supports all legislated OBD-II communication protocols, as well as the [...]

POWER INTEGRATION ICS AUTOMATIC AND SAFETY

Power Integration ICs Automatically and Safely Discharge X CapacitorsCAPZero acts as a smart high-voltage switch when placed in series with discharge resistors. When AC voltage is applied, CAPZero blocks current flow in the X capacitor safety discharge resistors, reducing the power wasted in these components to zero at 230 VAC. When the AC voltage is disconnected, CAPZero automatically and safely discharges the X capacitor by closing the circuit through the bleed resistors and directing the energy [...]

POWER CONVERTER TOPOLOGY AND MOSFET SELECTION FOR 48V TELECOM APPLICATIONS SCHEMATIC

POWER CONVERTER TOPOLOGY AND MOSFET SELECTION FOR 48V TELECOM APPLICATIONS SCHEMATICA typical specification can range from a low of 36V to a high of 72- with a 48-V nominal. In some designs, transients in excess of 100V need to be considered. Most of these designs will require input to output isolation of up to 1500V.Output voltages are frequently 5V and below with 3.3V probably the most common requirement, and 2.5V gaining in popularity. If a processor is on the card, voltages as low as 1.3V are [...]

PHONE BROADCASTER CIRCUIT SCHEMATIC DIAGRAM

PHONE BROADCASTER CIRCUIT SCHEMATIC DIAGRAMcircuit diagram of phone broadcaster is useful to hear the conversation between persons who use the telephone. This circuit doesn’t need additional power supply, as it is only need the power from the telephone line. The circuit has two sections, the automatic switching, and the FM transmitter.The automatic switching consists of resistors R1-R3, variable resistor VR1 as the regulator, transistor T1 and T2, zener diode D2, and diode D1. R1 and VR1 is useful [...]

MOUSE REPELLENT CIRCUIT SCHEMATIC DIAGRAM

MOUSE REPELLENT CIRCUIT SCHEMATIC DIAGRAMIt uses IC timer NE555. When the circuit at its close state, the IC will control the buzzer time using the resistor and capacitor. The buzzer sounds like alarm in the different frequencies. Resistor R1 : 1.8k ohm Resistor R2 : 1k ohm Resistor R3 : 5.6k ohm Resistor R4 : 480 ohm Capacitor C1 : 2.2 nF Polar Capacitor C2 : 0.022uF/6V IC1 timer : NE555 Speaker SP1 : Tweeter 8 ohm Power supply : [...]

MOSQUITO REPELLENT CIRCUIT SCHEMATIC DIAGRAM

MOSQUITO REPELLENT CIRCUIT SCHEMATIC DIAGRAMmosquitos coming to you. It uses IC CD4047 to control the buzzer timing utilizing resistor and capacitor. When the voltage passing through the transistor, the buzzer would sound. Variable resistor R1 : 10K ohm Polar capacitor C2 : 4.7 nF/16V Capacitor C3 : 22uF IC1 : CD4047 NPN transistor Q1-Q2 BC547 PNP transistor Q3-Q4 BC557 Buzzer K1 : Tweeter 8 ohm Power supply : [...]

CAR EXTERIOR LIGHTS CIRCUIT DIAGRAM

Mitsubishi Montero Exterior Lights Circuit Schematic DiagramMitsubishi Montero 1994 is shown in the following figure. It shows the connection and wiring between each parts and component of exterior lights system of the vehicle such as the fusible link, junction block, tail light relay, cruise control, stop light switch, relay box, column switch, rear combination light, front combination light, license light, hazard light switch, turn-signal and hazard flasher unit, park/neutral position switch, [...]

MINI AUDIO AMPLIFIER SCHEMATIC DIAGRAM

MINI AUDIO AMPLIFIER SCHEMATIC DIAGRAM“mini” audio amplifier referring to its small dimension and small output. It is intended for earpiece/earphone use. The characteristics are consume power less than 3mA, using push-pull output which can drive the earpiece to very loud level when audio is detected, whole circuit DC coupled, therefore makes it difficult to set up. Due to its size, be careful when assemble the circuit.The 8k2 across the 47u sets the emitter voltage on the BC 547 and this turns it [...]

LOW NOISE WHITE LED DRIVER SYSTEM SCHEMATIC DIAGRAM

LOW NOISE WHITE LED DRIVER SYSTEM SCHEMATIC DIAGRAMLM3570 is a parallel white LED driver capable of running directly off of a lithium-ion battery. The LM3570 has three parallel white-led drivers and a regulated VOUT pin (4.35V) capable of driving keypad or caller id display (CLI) diodes through the use of ballast resistors. The LM3570 evaluation board has a chip enable pin (active high logic) as well as a PWM (active high logic) pin which allows current sources to be turned on and off without completely [...]