Circuit panel

If you want to send video and audio signals are spread to multiple televisions simultaneously.
You may use a Video amplifier splitter by transistor BD137-BC547-BC557 circuits.
But it is limited. The need for wiring and is only about 4 set only.

Let’s try this circuit is DIY The wireless video & audio signal
sender. Can be used with a television receiver is not limited. And
wireless systems. Distance is about 40 feet. And important this circuit
small device. So is not difficult to create.
The working principle
??Block diagram of wireless audio video sender consists of as follows.
1.
A main frequency generator acts to produced the signal carrier of the
television signal. And is the main frequency of this project.
2. A
signal amplifier will amplify signal come from the frequency generator
circuit to up enough to can drive a power amplifier circuit.
3. A
frequency generator in VCO form, will produce a center frequency 5.5
MHz. Which this frequency will change by a input signal, contributes
to the FM modulated by a television signal system.
4. This power
amplifiers in addition to the high-power amplifier is the last time
before it was broadcast. Also acts as a modulated video signal and
audio. (Through the FM modulation) mixes with Signal carrier frequency
of the video signal in the AM as well.


The wireless audio video sender circuit is shown in figure 1. The
main frequency generator circuit in form of LC in a ground-base
configure type. By has L1 and trimmer C4(3-12pF) together to into a
tuning circuit at output.

For adjust the video signal
carrier frequency as you need in range of 450MHz-550MHz. The R1, R2, R3
are a bias circuits to Q1(C1674). By has C1 cut a high frequency at
pin base. Both capacitors C2 and C3 are connected as divider circuit
to determine rate of signal that feed back from collector to emitter.
The C3 so is not the bypass signal capacitor as general case.
This
frequency is send to amplify up by through coupling capacitor C5 to
transistor Q2(C1674) that is the signal amplifier circuit, The
resistors R4,R5,R6 are set to the bias circuit to Q2, a capacitor C6 is
capacitor bypass frequency to the ground, to protect the loss of power
at the R6.
The inductor L2 send the DC voltage to Q2 At the same
time, it was a RF Shock, prevent visual Signal carrier frequency,
output to supply it.
Since we want to have a frequency stability
over power. We make regulation the power supply circuit to this the
second input sector. With zener diode ZD1 by has value R9 is limit
current and filter to smooth with two capacitors C8 and C9, The signal
is amplified through the link on the capacitor C7 ,to Q4 that is power
amplifier circuit and AM modulation circuit with the same time, by
will be reduce by the resistor R8 to the appropriate size for the audio
signal to pass through the base pin of Q4. The same R7 and R8 are the
bias resistors to Q4 . The inductor L3 act same as L2 and because this
sector we want the best power than others , The power supply for this
,so come direct from the main power supply. By have capacitors C10,C11
and C23 are filter current for the signal that is modulated with the
video carrier wave, ready with the sound signal in AM form that will be
coupling and adjust the amplitude of signal suitably with C13,C14,C15
and R10, by has the VR1 is used to adjust percentage of modulation. The
audio signal will be coupling through C14 and C17 go to the Q3, by has
VR2 adjust the range frequency deviation
Both R11,R12 are the bias
resistors. The C18 is cut off high frequency on pin base. C19 and
C20 are the divider capacitors as same C2,C3, that is set as the
generator circuit on LC ground, base and configure same with Q1. But
the circuit is determined as VCO(voltage control oscillator) to
modulated the audio signal that into the FM input, by Center frequency
of 5.5MHz, which is the frequency difference between the Signal carrier
frequency video signal with audio carrier signal. The set of values of
T1 and C21.
The audio signals through the FM modulation through T1
and C12 are the coupling pin to the base of Q4. The power supply that
entered to this section will be regulaed as 5 volts by zener diode
ZD2, has R3 is limiter current and filter to smoothed do not the high
frequency within by C22. The television signal is completed form outout
of Q4 will be sened Will be spread broadcast antenna, the capacitors
C24 and C25 act as the matching circuits. For the status of the device
is indicated by LED1, with limit current by R14.

AUDIO SCHEMATIC AND ROUTING ELECTRONIC DIAGRAM

It has explode rainbow light voguish the front panel and very beautiful by night. Light & set Aluminum alloy pencil case on behalf of distribution of roast without doubt RCA Input , can be real used such as Ipod,MP3/MP4 headset amplifier Mini size calm to installation by DIY, especially talented fit for car, motor bike and other audio DIY device.

• P.M.P.O,: 2 x 180W, R.M.S.: 2 x 20W
• Input power: 12V 6A DC, (power supply included)
• Input sensitivity: 200mv
• Speaker impedance : 4 - 8ohm

The existence of the peak indicator (Audio Peak Indicator) in an audio device is needed. Audio Peak indicator is a simple circuit to detect the peak level of audio signal. Audio Peak indicator circuit is built with duabuah transistor and LED indicator as peak level detection of audio signals. 

The main function of a series of Audio Peak indicator is to determine the occurrence of the peak level of audio signal which is more than +4 dB, equivalent to 1.25 V rms. If the received audio signal Audio Peak Indicator more than +4 dB was the LEDs in series Peak Audio This indicator will light. Audio Peak indicator circuit is mounted on the output audio system.