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Saturday, April 13, 2013

Temperature warning indicator circuit

The circuit is a low temperature regulator, supervisor, warns us about international warming. Temperature control is completed by the thermistor TH1, which is a negative issue. The resistance varies between 10KO at 25 ° C and about 1KO at ninety four ° C. The trimmer TR1 keep watch over the precise temperature at which the Q1-2, related as a Darlington, lead me, making the relay K1 to close and IZ, sound.

The alarm is activated when the temperature is better than the default. The thermistor must be positioned far from the remainder of the circuit, in order not to possibility from the warmth. The power circuit is battery 9V, but whether it is established in a exhausting and fast position, then we can provide with a relentless voltage power supply. The relay contacts might be linked load which we, as a bulb, another circuit, and many others. It may also add an LED, if we're to sign and visual stimulation.

The adjustment is done by using immersing the thermistor TH1, within the water which we all know the temperature (contacts should be neatly insulated so we don't have brief circuit) and adjusting the trimmer except the circuit is happy. The cable connecting the circuit with the TH1 have to be shielded.

Part List
R1= 820 ohm
R2-3= 1Kohm
C1= 220uF 16V
TR1= 2.2Kohm Trimmer D1= 5.6V 0.5W Zener
D2-3= 1N4148
Q1-2= BC550C
TH1= Thermistor 10Kohm at 25° C
K1= 6V 200 ohm Relay
BZ1= Buzzer
S1= 1×2 Switch
BATT= Battery 9V or exterior supply

Application
This circuit is designed not only putting a become aware ofion of high temperatures, however can also be modified to be set on the detection of low temperatures in some houses. It can be utilized for refrigeration, walk-in fridge or freezer and other environments which can be sensitive to temperature. Some built-in circuits excessive-temperature alarm modules might be used in motor autos to the occupation through which the temperature component experiences a temperature very dangerous in the inside of a motor automobile, and motivates the employment sensor realizes the presence or resolve the absence of an occupant. In the absence of the inhabitants, the sensor is that after a length during which an audible alarm is activated to offer the attention to the motor car within the presence of an occupant. This kind of alarm will be reset with a key.

Take a temperature alarm could be advantages this form ofs give safety toion of valuable equipment by way of high temperature, low temperature, high humidity or every so often equipped. Other packages of excessive temperature can be utilized to offer protection to against loss of or against the air conditioning machine for heating off. Instead, this machine for low-temperature failure of the heating machine be used to forestall frozen pipes. The alarm may additionally scale back downtime, get a telephone call and the now notification of a conceivable power failure or failure before damage occurs in one unit

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Thursday, April 4, 2013

How to Make Simple Low Battery Voltage Indicator Using IC 741

removed by request.

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Sunday, March 24, 2013

Six LED Bar Audio Power Indicator

Useful to monitor audio power delivered to loudspeakers No power supply no setup required

This device, connected to the loudspeaker output of an audio amplifier, will indicate the instantaneous output power delivered to the loudspeaker(s) by means of six LEDs illuminating one after another by voltage values increasing little by little, providing the visual impression of a luminous bar or column, increasing and decreasing in height following the increase and decrease of the signals level.

The input signal is first rectified by D1 and then sent to six different voltage dividers, one for each LED. In this way, the indication provided by the LEDs illumination of this "Power Display", will be related to the instantaneous power sunk by the whole loudspeaker cabinet.

Six output power levels are displayed by the LEDs in a 2W - 80W range (no setup required). Each nominal power level indication into 8 Ohms load is reached when the respective LED illuminates at full brightness.

Circuit Diagram:

Six-LED Bar Power Indicator Circuit diagram Six-LED Bar Audio Power Indicator Circuit Diagram

Parts	Description
R1	220R 1/2W Resistor
R2,R5,R6,R8	100R 1/4W Resistors
R10,R12,R14	100R 1/4W Resistors
R3	220R 1/4W Resistor
R4,R7	330R 1/2W Resistors
R9	560R 1/2W Resistor
R11	820R 1/2W Resistor
R13	1K2 1/2W Resistor
D1	1N4004 400V 1A Diode
D2,D4,D6	BZX79C2V7 2.7V 500mW Zener Diodes
D3,D5,D7,D8,D9,D10	Red LEDs (Any dimension and shape) (See Notes)

Notes:

The output power indicated by each LED must be doubled when 4 Ohms loads are driven.
The circuit can be adapted to suit less powerful amplifiers by reducing the number of LEDs and related voltage dividers.
LEDs of any dimension can be used, but rectangular shaped devices will be more suitable to be compacted in bars or columns.
For a stereo amplifier, two identical circuits are required.

Source : www.redcircuits.com

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