Showing posts with label schematic. Show all posts
Showing posts with label schematic. Show all posts
Tuesday, December 24, 2013
TV audio video transmitter Schematic Diagram
This is a simple TV audio video transmitter circuit can be constructed using this schematic diagram . This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable .
Video signals input at jack J1 are first terminated by resistor R6 and coupled through capacitor C1 to clamping-diode D1. Potentiometer R3 is used to set the gain of the video signal; its effect is similar to that of the contrast control on a TV set.
TV audio video transmitter Schematic Diagram
Bias-control R7 can be used to adjust the black level of the picture so that some level of signal is transmitted, even for a totally dark picture.
RF-transformer T1 and its internal capacitor form the tank circuit of a Hartley oscillator thats tuned to 4.5 megahertz. Audio signals input at J2 are coupled to the base of Q3 via C2 and R4: the audio signal modulates the base signal of Q3 to form an audio subcarrier that‚s 4.5-megahertz higher than the video-carrier frequency.
The FM modulated subcarrier is applied to the modulator section through C5 and R9.
Resistor R9 adjusts the level of the subcarrier with respect to the video signal.
Resistor R9 adjusts the level of the subcarrier with respect to the video signal.
Transistors Q1 and Q2 amplitude modulate the video and audio signals onto an RF-carrier signal. The operating frequency is set by coil L4, which is 3.5 turns of 24- gauge enameled wire on a form containing a standard ferrite slug.
The RF output from the oscillator (L4, C7 and C9 ) section is amplified by Q5 and Q6, whose supply voltage comes from the modulator . Antenna matching and low-pass filtering is performed by C12, C13, and L1.
Resistor R12 is optional; it is added to help match the output signal to any kind of antenna.
To align this audio video transmitter you need to tune a TV receiver to an unused channel between 2 and 6. The TV must have an indoor antenna connected directly to it; an outdoor antenna or cable wont work. Make sure both potentiometers (R3, R7) are in middle position and apply power to the transmitter. Adjust L4 with a nonmetallic tool until the TV screen goes blank ,then fine-adjust L4 for the "most-blank" picture.
Connect the video and audio outputs from a VCR(AV source) to jacks J1 and J2 (respectively) of the transmitter .
After that you should see a picture on the TV screen: if you do, readjust L4 for the best picture; if you dont, check the board for any bad connections. Next, adjust R3 for the best picture brightness and R7 for the best overall picture.
Finally, adjust T1 with a nonmetallic tool for the best sound .
The TV transmitter combines line level audio and video signals, and transmits the resulting signal up to 300 feet. The circuit can be powered from a 9-12V power supply circuit .
Wednesday, June 5, 2013
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Tuesday, June 4, 2013
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Friday, May 31, 2013
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Tuesday, May 14, 2013
IC LM72 latest Peak Level Indicator Schematic
Circuit Peak Level Indicator by LM723
This the circuit checks signal sound level or Circuit Peak Level Indicator by LM723. Usual we often lead IC LM723 or UA723 come to use do , DC voltage Regulator. But for this circuit , build the circuit can check signal sound level with. When see the structure changes the integrated circuit. As a result participate of check volage with then bring apply for this not difficult work extremely. As a result request friends study the work has of the circuit follows a picture
Friday, April 12, 2013
2V to 25V Power Supply Schematic Rise
2V to 25 Power supply
This project makes use of a LM338 adjustable three terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC. It will come in handy to power up lots of electronic circuits when you are assembling or building any electronic devices. The schematic and parts list are designed for a power supply input of 240VAC. Change the ratings of the parts if 110VAC power supply input is necessary.
As shown in the figure above, the mains input is applied to the circuit through fuse F1. The fuse will blow if a current greater than 8A is applied to the method. Varistor V1 is used to clamp down any surge of voltage from the mains to protect the parts from breakdown. Transformer T1 is used to step down the incoming voltage to 24V AC where it is rectified by the diodes D1, D2, D3 & D4. Electrolytic capacitor E1 is used to smoothen the ripple of the rectified DC voltage.
Diodes D5 & D6 are used as a protection devices to prevent capacitors E2 & E3 from discharging through low current points in to the regulator. Capacitor C1 is used to bypass high frequency part from the circuit. Make definite that a large heat sink is mounted to LM338 to transfer the heat generated to the atmosphere.
Monday, March 25, 2013
Typical Trailer Wiring Diagramcircuit Schematic
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Sunday, March 24, 2013
Daewoo Korando Back Up and Stop Lamp Schematic and Routing Diagrams
Back up and stop lamp schematic of Daewoo Korando shown in the following figure. It shows the connection and wiring between each parts and component of back up and stop lamp system of the vehicle such as alternator, ignition switch, stop switch, b/o switch, antilock brake system, back up switch, back up lamp, and many others. Here is the schematic :
Continue reading...
Friday, March 22, 2013
FM Radio Transmitter schematic with pcb
For those of you like / love to talk in the air can assemble this simple circuit that can be received by the radio receiver to within a few hundred feet. The voice that issues by this circuit at all clear without rustling. Can also be used to link communications over the air using this radio transmitter, provided that other person also had the same circuit.
This PCB design :
Description :
Resistor
R1__________________1K
R2__________________18K
R3__________________82K
R4__________________1K2
R5__________________5K6
R6__________________39K
R7__________________18K
R8__________________68K
R9__________________470R
R10_________________100R
R11_________________50K
XTal
Q1__________________ Crystal according to the desired frequency
Inductor
L1__________________10uH
Capacitor
C1__________________10uF
C2__________________30uF
C3__________________20uF
C4__________________47uF
Transistor
Tr1_________________2SB175
Tr2_________________2SB175
Tr3_________________2SB178
Antenna
X1-1________________10-20 meters
Connector
X2-1________________Ground
X2-2________________VCC 9-12 Volts DC
X3-1________________Input
X3-2________________Ground
LM390 power amplifier schematic
Circuit schematic above is / include power amplifiers that have low power output. 1 Watt output power is only based on the IC , and ic used LM390 , manufactered by NS and ic packaged in DIP-14. For output impedance have 4 OHm. Requires a minimum voltage 4 Volt and Maximum voltage is only 9Volt.
Resistor
R1________33K
R2________510R
R3________510R
R4________2.7R
Capacitor
C1________100uF 16V
C2________100uF 16V
C3________10uF 16V
C4________220uF 35V
C5________10uF 16V
C6________100n
IC
IC1_______LM390
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