Schematic Rise

Sunday, August 24, 2014

Simple Sound Activated Switch

Simple Sound Activated Switch Circuit diagram : Control by sound may be very useful, not just on a robot but also for a bit of home automation, for example a sound activated light responding to a knock on the door or a hand clap. The light will be automatically switched off after a few seconds. An alternative use is burglar protection — if someone wants to open the door or break some-thing the light will come on, suggesting that someone’s at home. The schema can work from any 5– 12 VDC regulated power supply pro-vided a relay with the suitable coil voltage is used.

Simple Sound Activated Switch Circuit diagram :

Sound Activated Switch Circuit Diagram

When you first connect the supply voltage to the schema, the relay will be energised because of the effect of capacitor C2. Allow a few seconds for the relay to be switched off. You can increase or decrease the ‘on’ period by changing the value of C2. A higher value results in a longer ‘on’ period, and vice versa. Do not use a value greater than 47 µF. Biasing resistor R1 determines to a large extent the microphone sensitivity. An electret microphone usually has one internal FET inside which requires a bias voltage to operate. The optimum bias level for response to sound has to be found by trial and error.

All relevant electrical safety precautions should be observed when connecting mains powered loads to the relay contacts.

Process formation of RGB signal on TV

Basically the UOC is equipped with RGB or YUV input from external, so it is possible to use the DVD input. Selection of these inputs can be done internally within the IC. But in the G7 and G7A chassis input YUV signal is not used, so in the ground.

Simple Audio Booster

This is a simple and low-cost audio booster schema design. The schema is based on general purpose amplifier and switches, 2N3392 transistor packed in TO-92. This schema should be installed before power amplifier module.

To get the maximum audio performance, use metalfilm resistors, MKM and tantalum capacitors which have small tolerance of its value. Also, use stabilized and regulated 9V power supply for better result. You can simply use LM7809 IC regulator on 12V power supply to get stabilized 9V output. The 100K variable resistor is used to adjust the volume, you may remove this component and use main volume in your audio system.

TBA611 amplifier schematic

This amplifier circuit requires voltage ranging from 4Volt to 12Volt, a relatively low voltage. And strong currents needed to obtain a good sound is not too big. This amplifier circuit has a power output or speakers 1W. The output is very small when compared with the voltage amplifiers high. To use it can be used in radio tuner or radio receiver. The series of schemes can be seen below.

Technical information

Vcc = 4,5-15 V

Pout = 1 W

RL = 8 Ohm

Ft = 50-15 Khz

Icco = 10 mA

Package = TABS4-14

Manufactered = RFT

27MHz Walkie Talkie Wiring diagram Schematic

This is a schema of a Walkie Talkie operating frequency of 27MHz, citizens band or PX. Its operation is simple when the walkie-talkie is in the receive mode, the first transistor is configured as a receiver and audio then passes through a volume control and the three transistor amplifier.

When the Walkie-talkie is in the transmit mode, the speaker is placed at the input of audio amplifier functioning as mic.The audio is then amplified and reaches the transmitter. The crystal is connected to the first phase and gain of the transistor. The transmitter will operate up to 20m.

27MHz Walkie Talkie Circuit Diagram

Saturday, August 23, 2014

2006 Lincoln Audio Wiring Diagram

The part of 2006 Lincoln Audio Wiring Diagram: central junction block, hot in run, hot in start, speaker, module communication network, audio unit, electronic hidden antenna module, auxiliary junction box, antenna.

Mobile Car Stereo Player TDA1554

Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music player with the help of a stereo power amplifier. This does away with the need of a sophisticated in-dash car music system. Most mobile phones have a music player that offers a number of features including preset/manual sound equalisers. They have standard 3.5mm stereo sockets that allow music to be played through standard stereo headphones/sound amplifiers. Nokia 2700 classic is an example.

Mobile Car Stereo Player Circuit Diagram

A car audio amplifier with 3.5mm socket can be designed and simply connected to the mobile phone output via a shielded cable with suitable connectors/jacks (readymade 3.5mm male-to-male connector cable is a good alternative). Fig. 1 shows the circuit of car stereo player. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). The TDA1554Q is an integrated class-B power amplifier in a 17-lead single-in-line (SIL) plastic power package.

IC TDA1554Q contains four 11W identical amplifiers with differential input stages (two inverting and two non-inverting) and can be used for single-ended or bridge applications. The gain of each amplifier is fixed at 20 dB. Here it is configured as two 22W stereo bridge amplifiers. The amplifier is powered from the 12V car battery through RCA socket J2. Diode D1 protects against wrong-polarity connection. LED1 indicates the power status.

Stereo Jack :

(a) 3.5mm stereo socket and (b) 3.5mm Stereo Jack

Connect stereo sound signal from the 3.5mm headset socket of the mobile phone to audio input socket J1. When you play the music from your mobile, IC1 amplifies the input. The output of IC1 is fed to speakers LS1 and LS2 fitted at a suitable place in your car. Electrolytic capacitor C5 connected between pin 4 of IC1 and GND improves the supply-voltage ripple rejection. Components R2 and C4 connected at mute/standby pin (pin 14) of IC1 eliminate the switch on/off plop. The circuit is quite compact. A good-quality heat-sink assembly is crucial for IC1. Fig. 2 shows the stereo socket and stereo jack.

Proposed enclosure

Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. Small dimensions of the power amplifier make it suitable for being enclosed in a plastic (ABS) case with vent holes. Signal input socket, speaker output terminals, on/off switch, indicator, fuse holder and power supply socket are best located on the front panel of the enclosure as shown in Fig. 3.
Author : T.K. Hareendran - Copyright : EFY