Circuit diagram

Friday, November 22, 2013

LM1800 FM Stereo Demodulator

This FM Stereo Demodulator circuit that use phased lock loop techniques to regenerate the 38kHz subcarrier is designed using the LM1800 integrated circuit .The LM1800 integrated FM stereo demodulator has numerous features like :automatic stereo/monaural switching , 45 dB power supply rejection ,wide operating supply voltage range ,excellent channel separation .As you can see in the circuit diagram this lm1800 fm stereo demodulator has a 100mA stereo indicator lamp driver.

LM1800 FM Stereo Demodulator Circuit diagram

For this LM1800 Phase-Locked Loop FM Stereo Demodulator circuit , you will need an dc power supply that can provide an output voltage between 10 and 18 volts .Also if you can not find the LM1800 Phase-Locked Loop FM Stereo Demodulator circuit on the market you can use the UA758 ic which is pin-to-pin compatible with LM1800 .

Amplifier Circuit with IC AN7143

On this Integrated circuit power amplifier use IC AN7143 but you can use this following IC :

AN7147	HA1377
AN7149N	HA1377A
AN7168	HA1392
AN7169	HA1398

AN7176	HA13102
AN7178	HA13108
M5160L	ULX3777

You can use all the IC above on this circuit below :

This Circuit require minimum voltage 9 volt , and Maximum voltage 24 volt. Supply voltage with dual voltage not triple voltage. Maximum Output power 2 X 20 watt , with minimum impedance 4 Ohm. This is a stereo power amplifier Circuit. Notif the similiar IC have each distinct power.

Thursday, November 21, 2013

USB Car Charger Adapter

This USB car charger adapter project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This USB car charger circuit can be used to supply power from a car cigar lighter socket to a portable device that require a 5 volts . This circuit makes it possible to power/recharge any USB power-operated device, using in-dash board cigar lighter socket of your car.

USB Car Charger Adapter Circuit diagram

The DC supply available from the cigar lighter socket is fed to an adjustable, three-pin regulator LM317L (IC1). R1 and R2 resistors regulate the output of IC1 to steady 5V, which is available at the ‘A’ type female USB socket. Red LED1 indicates the output status and zener diode ZD1 acts as a protector against high voltage.As you can see in the circuit diagram , the circuit is very simple and require just few common cheap components .Because this circuit not require many components , you can put all components in the cigar plug socket .

450W audio power amplifier circuit

Below it is a circuit of power amplifiers with power output of 450 watts mono , amplifiers are also frequently used in the amplifier a high-power amplifier, which used in an event, in the field and the placed closed. Because this amplifier suitable for the woofer, fullrange speaker, and can also be fixed for the subwoofer speaker.

To further strengthen and maximize the amplifier ,its power supply circuit also must be accurate, for electrolytic capacitors in power supply ,voltage capacitors use 80V or more, and a capcity 20000uF upwards, so when the bass amplifier is high , the voltage is not lot of experience dropping. Diode bridge use a minimum of 35A, or adjust the current input voltage. If the power supply has fulfilled the desire, the supply to the power amplifier.

Schematic Audio Power Amplifier with IC AN7110 AN7130

Description Schematic :

Minimum Voltage for this Circuit is 6 Volt , and Maximum voltage is 18 Volt . To recomended circuit working use voltage 12 Volt. Its not So much and less , its good. Output speaker is Mono with power 1,2 watt and Impedance 8 Ohm. IC equal with AN7130.

See schematic circuit audio power amplifier AN7110 or AN7111 :

Click to view Enlarge

Wednesday, November 20, 2013

Rapid battery charger schematic

The First ac voltage from tranformator will be rectified and filtered to the LM723 voltage regulator and the NPN pass transistors setup for constant current supply. The 470 Ohm resistor is limit trickle current the momentary pushbutton (S2) is depressed, the SCR turn on , and the current flows through previously determined resistor network.SCR will be turn off if thermal cutout inside the battery pack opens up.

Digital Radar Speedometer Schematic

This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser reflexion. It sends laser radiation to the object and this object reflects the laser radiation to the radar. To evaluate the speed of a vehicle, we must be in front of it. In other words, the vehicle must come in our direction. The front of the radar must point the front of the vehicle. The radar has the shape of a pistol. In this radar, it has a laser LED and a laser diode. Both have a lens.

Digital Radar Speedometer Circuit Diagram

The laser LED can send a spot of light to a distance of 90 m (295 ft). Its very important that the distance range of the laser LED is 90 m, if not, the speed will not be calculated properly. The laser diode, which receives the light signal by the laser LED, must be able to detect the light which is same color as that emitted by the laser LED. The laser diode and the laser LED must be placed one beside the other. They are protected by a tinted pane. They must be placed at the front of the radar and point the outside. The radar is powered by a 9V battery and it has a SPST switch to control its power state.

The display, or the speed indicator, is placed at the rear of the radar, just on the right of the overload LED indicator. All the logic components of the circuit must be of the 74AS series and TTL type. Because they have short time of response (less than 1.7 ns) and have high frequency supports (more than 200 MHz). The radar can evaluate the speed of an object moving between 0 to 999 km/h. After this speed, the overload LED indicator will turn on and the "999" will still displayed. The radar displays the speed during 3 seconds, after this time, it displays "zero" (0).