Phone busy pointer circuits

Phone circuits are busy pointer. A busy signal is a signal that indicates that someone is trying to call a phone number but could not be contacted because the phone if it is not involved, or because the circuits are busy, calls are impossible to solve.

On many phones, busy signals take the form of a distinctive tone, but a busy signal can also be visual, as in the case yanga phone designed for users of deafness or hearing impairment. Many people are familiar with a busy signal sounds, because significantly different from the dial tone, a tone that indicates that the phone line is open and ready to be called.

In most cases, only a busy signal indicates that the person you are calling is a call. A busy signal will also sound when the phone is turned off. In this case, the signal indicates that there are no technical obstacles to placing the call, but calls can not be completed because the phone is in use.

In some cases, you can ask the operator to enter, if you call in an emergency, in this case the operator will interrupt the call and inquire whether the subject is willing to take your call.

Have you ever use a modem or fax and someone else pick up the phone, disconnect? Phone circuits are busy these simple pointers that will end all that. Menunjukkam phone signal is being used then the red LED. When the phone is not used, the green LED lights up. It does not require external power and can be connected anywhere on the phone line, even mounted inside the phone.

Phone busy pointer circuits 

List of Components:

R1 = 3.3K 1/4 W Resistor

R2 = 33K 1/4 W Resistor

R3 = 56K 1/4 W Resistor

R4 = 22K 1/4 W Resistor

R5 = 4.7K 1/4 W Resistor

Q1, Q2 = 2N3392 NPN Transistor

BR1      = 1.5 Amp 250 PIV Bridge Rectifier

LED1   = LED red

LED2   = LED green

Others  = Wire, Containers, Telephone Cable

This circuit is very simple and easy to make on the board and installed on the phone. Try a series of telephone busy pointer

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50W Circuits Car Subwoofer Amplifier

The Car Subwoofer Amplifier 50W Circuit was posted by the side of trendy kind Amplifier. Please examine carefully and look on circuit design pictures of Car Subwoofer Amplifier 50W Circuit to catch aspect in sequence.

50W Circuits Car Subwoofer Amplifier 

This car stereo amplifier with TDA1562Q so as to can output 50W of audio power. at this time’s the complete incline :

2 resistors 1 KOhms

2 resistors 4,7 KOhms

2 resistors 100 KOhms

2 resistors 1 MOhms

4 capacitors 470 nF LCC 63V

4 capacitors 10 µF 63V radiaux

6 capacitors 4 700 µF 25V radiaux

2 capacitors 100 nF LCC

1 capacitor 10.000µF 25V radial

2 x LED

2 x TDA1562Q

2 switches unipolaires

2 heatsink (Rth <2.5°c/w) (+ pasta termica)

Wire Break Alarm With Delay Circuits Diagram

Simple Wire-Break Alarm With Delay  Alarm and Security Here is a simple circuit of wire-break alarm that activates after a delay of 15 to 30 seconds. When the thin-wire loop running across the entrance door is broken, the alarm sounds after a delay of 15 to 30 seconds, the time period set through VR1. Thus the occupants get sufficient time to lock the room from the outside and catch the thief. 

 The circuit uses CD4060, which is a 14-stage ripple-carry binary counter/divider and oscillator. It is wired as a timer here and does not need input pulse for trigger. CD4060 gets activated as soon as the power supply is switched on. Output O13 of CD4060 goes high after the lapse of preset delay set through VR1. Transistor SL100 (T2) is wired as a switch to power the timer section built around CD4060. When the wire loop is closed, transistor T2 does not conduct. So power to the timer circuit is not available and the piezobuzzer does not sound. 

Wire-Break Alarm With Delay Circuit Schematic

On the other hand, when the wire loop is broken by some intruder, transistor T2 conducts to power the circuit and the piezobuzzer sounds after 15 to 30 seconds. IC1 can be reset by connecting the wire loop or interrupting the supply. The circuit works off regulated 9V-12V. Assemble it on a general-purpose PCB and enclose in a metallic or plastic box of appropriate size. Connect piezobuzzer PZ1 through external wires and complete the installation. Link

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The Nite Rider Lights Circuits Diagram

As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my fellow cyclists rear lights, I came up with the idea of NITE-RIDER. NINE extra bright LEDs running from left to right and right to left continuously.

It could be constructed with red LEDs for use on the rear of the bike or white LEDs for an extra eye catcher on the front of the bike. All ICs are CMOS devices so that a 9V PP3 battery can be used, and the current drawn is very low so that it will last as long as possible.

Nite Rider Lights Circuits Diagram

Parts

1 555 timer IC4.

1 4027 flip flop IC1.

2 4017 Decade Counter IC2 and IC3.

3 4071 OR gate IC5, IC6 and IC7.

1 470 Ohm resistor 1/4 watt R3.

2 10K resistors 1/4 watt R1 and R2.

1 6.8UF Capasitor 16V C1.

9 Super brght LEDs 1 to 9.

1 9V PP3 Battery.

1 single pole switch SW1.

1 Box.

How This Circuit Works.

IC4, C1, R1 and R2 are used for the clock pulse which is fed to both the counters IC2 and IC3 Pin 14. IC1 is a Flip Flop and is used as a switch to enable ether IC2 or IC3 at pin 13. IC7a detects when ether IC2 or IC3 has reached Q9 of the counter pin 11. IC5, IC6 and IC7a protects the outputs of the counters IC2 and IC3 using OR gates which is then fed to the Anodes of the LEDs 1 to 9.

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