Do-it-your-self Projects

The circuit uses popular timer IC NE555 as a Schmitt trigger to give the bistable action. The set and reset functions of the comparators within the NE555 are used to give the instantaneous action. The upper threshold comparator of IC1 trips at 2/3Vcc, while the lower trigger comparator trips at 1/3Vcc.The inputs of both the threshold and the trigger of NE555 are tied together and connected to the voltage divider formed by LDR1 and
VR1. The voltage across LDR1 depends on the light intensity.
In daylight, LDR1 has low resistance and the input voltage to the threshold comparator goes above 2/3Vcc and its output becomes zero, and the lamp remains off.
At sunset, the resistance of LDR1 increases, and the voltage at the input of the threshold comparator decreases below 2/3Vcc and that of the trigger comparator goes below 1/3Vcc. As a result, the outputs of threshold and trigger comparators go high. Thus it completes the power supply to the lamp through triac1. LED1 glows to indicate the high output state.

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• Item Code: BE10054
• Minimum Order Quantity: 1 Piece

The circuit described here is of an electronic combination lock for daily use. It responds only to the right sequence of four digits that are keyed in remotely.

The circuit uses IC4013.
Operating voltage - 12V DC

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• Item Code: BE10043
• Minimum Order Quantity: 1 Piece(s)

Specifications:

• Input sensitivity: 25 nVram (-20 dBm)
• Max. input level: 1 Vrms (+13dBm)
• Damage level: 3 Vram (+23dBm)

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• Item Code: BE10031
• Minimum Order Quantity: 1 Piece

Specifications:

• Static Current: ≤15 uA
• Weight: 2 KG
• Alarm sound: 117 dB

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• Item Code: BE10024
• Minimum Order Quantity: 1 Piece

Specifications:

• Applicable Temperature: 20-50
• Power Support: 4AA alkaline batteries

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• Item Code: BE10057
• Minimum Order Quantity: 1 Piece

Specifications:

• Size: L37.5 X W 38.5 X H 27 CM
• Weight: 0.06 kg

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Additional Information:

• Item Code: BE10010
• Minimum Order Quantity: 1 Piece

Specifications:

• Min. Hole Size: 0.1 mm
• Min. Line Width: 3 Mil
• Min. Line Spacing: 3 Mil

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• Item Code: BE10006
• Minimum Order Quantity: 1 Piece

We are engaged in offering Musical Door Bells, these musical door bells are available in different tunes for our valuable clients to meet the demands of clients. These musical bells are made of higher quality bronze alloys.

Specifications:
                                               

• Power Output: 18 V
• Resolution: 420 TVL
• Temperature: 20-70 °C  

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• Item Code: BE10002
• Minimum Order Quantity: 1 Piece

Specifications:

• Frequency: 433 Mhz
• Distance: 0-25 m

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• Item Code: BE10017
• Minimum Order Quantity: 1 Piece

We are manufacture and exporter of Fire Alarm Systems, a higher grade raw material used in this alarm. The fire alarm systems sense if there are any dust or smoke in environment and ring. We offer it on market leading prices.

Specifications:

• Wireless frequency: 315 MHz/433 MHz
• Power Requirements: AC 220V 50Hz/60 Hz
• GSM Frequency: 900/1800 MHz (standard)

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• Item Code: BE10029
• Minimum Order Quantity: 1 Piece

Here is a musical call bell that can be operated by just bridging the gap between the touchplateswith one’s fingertips. Thus there is no need for a mechanical ‘on’/‘off’ switch because the touch-plates act as a switch. Other features include low cost and low power consumption. The bellcan work on 1.5V or 3V, using one or two pencil cells, and can be used in homes and offices.Two transistors

The circuit uses ICUM66. 

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• Item Code: BE10037
• Minimum Order Quantity: 1 Piece

This is a simple circuit to build a traffic signal using an IC 555 - Timer and IC CD4017 – Decade Counter. In a Traffic light there are three different color LED which are Green (Go), Yellow (Caution) and Red (Stop). Here IC 555 is used in Astable Multivibrator Mode. The timing of signal can be adjusted by varying potentiometer.

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• Item Code: BE10127
• Minimum Order Quantity: 1 Piece
• Port of Dispatch: coimbatore

This is a simple circuit to build a Electronic Candle using a transistor and condenser mic. A condenser mic is used to sense puff. An E-Candle simulates a candle lit. To light the candle you have to press a button and to blow it off you have to puff over the mic

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• Item Code: BE10128
• Minimum Order Quantity: 1 Piece

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• Item Code: BE60185
• Minimum Order Quantity: 1 Piece

Here’s the circuit of a multi-switch input musical doorbell (shown in Fig.1). The circuit is built around the popular and less expensive quad D-latch CD4042B (IC1).

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• Item Code: BE10035
• Minimum Order Quantity: 1 Piece

This is an easy to use fire alarm. The circuit uses an NTC as a temperature sensor. As this temperature around NTC increases its resistance decreases. A potentiometer is used to provide a reference voltage. As the temperature around NTC increases, a voltage drop occurs which drives a transistor in turn activating the buzzer & glowing the LED.

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Additional Information:

• Item Code: BE10130

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• Minimum Order Quantity: 1 Piece