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.

Additional Information:

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

Specifications:

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

Additional Information:

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

Specifications:

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

Additional Information:

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

Specifications:

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

Additional Information:

• Item Code: BE10057
• 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)

Additional Information:

• Item Code: BE10029
• 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.

Additional Information:

• 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

Additional Information:

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

Additional Information:

• 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).

Additional Information:

• 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.

Additional Information:

• Item Code: BE10130

Additional Information:

• Minimum Order Quantity: 1 Piece