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Video amplifier splitter by transistor BD137-BC547-BC557
is designed to take video signal is stronger. Compensate for the loss
of signal, and is video splitter video, which can connect up to three
outputs. so is suitable for display on several television screens, or
video tapes recording at the same time too. (Now may will no video
tape.)
The advantage of this circuit is cheap, easy and the results are detailed in the circuit below.
How it works
Technical specifications
- Increasing rate Typically, the circuit video amplifier is
designed to have low amplifier rates. (it different with the common
pre-amp circuit) For our the circuit has the maximum gain ratio is only 4
times.
- Impedance is 75 ohms on both the input and output.
- Bandwidth of this circuit wide is 5 Mhz.
It can be seen that the circuit contains only three transistors. By Q1
(BC547), Q2 (BC557) acts as a signal amplifier, and Q3 (BD139 or BD137)
serves as the output circuit of common emitter follower.
The input impedance of circuit is determined by the value of
R1. The input signal entered through C2 to the base of Q1. By the VR1 is
the set the level of the signal swing.
The output of Q1 is connected directly to the base of
Q2. The amplified gain of the circuit is determined by adjusting VR2.
Which is in the feedback circuit, between collector pin of Q2 and
emitter pin of Q1.
However rate of increase depends on the ratio between the
resistance of R5 and R6, R8, VR2, C3. The based on the components used
in the circuit is 1.95 to 8.7 times the rate of increase. Thus, the
output 75 ohm load to the rate of increase of the last, reduce the
signal to half will be output signal is only 1-4 times.
The R9 that may change to suit the application. For
example, if only a single channel networks that use the 150 ohm. If the
second channel is used for network 82 ohms, the current in the circuit
will decrease.
and The LM7812 is main of Dc voltage Regulator circuit in this project
that I think you still to know about it very well for popular ICs.
The building
All equipment can be assembled on a PCB as shown in the figure below.
You should put the device in the circuit to be completed. Points of
caution is that capacitors, diodes and transistors put always the
correct way. Otherwise, the circuit does not work. And damage.
Video amplifier splitter by transistor BD137-BC547-BC557
This is the video amplifier circuit or the video splitter circuit, it
is designed to take video signal is stronger. Compensate for the loss
of signal, and is video splitter video, which can connect up to three
outputs. so is suitable for display on several television screens, or
video tapes recording at the same time too. (Now may will no video
tape.)
The advantage of this circuit is cheap, easy and the results are detailed in the circuit below.
How it works
Technical specifications
- Increasing rate Typically, the circuit video amplifier is
designed to have low amplifier rates. (it different with the common
pre-amp circuit) For our the circuit has the maximum gain ratio is only 4
times.
- Impedance is 75 ohms on both the input and output.
- Bandwidth of this circuit wide is 5 Mhz.
It can be seen that the circuit contains only three transistors. By Q1
(BC547), Q2 (BC557) acts as a signal amplifier, and Q3 (BD139 or BD137)
serves as the output circuit of common emitter follower.
The input impedance of circuit is determined by the value of
R1. The input signal entered through C2 to the base of Q1. By the VR1 is
the set the level of the signal swing.
The output of Q1 is connected directly to the base of
Q2. The amplified gain of the circuit is determined by adjusting VR2.
Which is in the feedback circuit, between collector pin of Q2 and
emitter pin of Q1.
However rate of increase depends on the ratio between the
resistance of R5 and R6, R8, VR2, C3. The based on the components used
in the circuit is 1.95 to 8.7 times the rate of increase. Thus, the
output 75 ohm load to the rate of increase of the last, reduce the
signal to half will be output signal is only 1-4 times.
The R9 that may change to suit the application. For
example, if only a single channel networks that use the 150 ohm. If the
second channel is used for network 82 ohms, the current in the circuit
will decrease.
and The LM7812 is main of Dc voltage Regulator circuit in this project
that I think you still to know about it very well for popular ICs.
The building
All equipment can be assembled on a PCB as shown in the figure below.
You should put the device in the circuit to be completed. Points of
caution is that capacitors, diodes and transistors put always the
correct way. Otherwise, the circuit does not work. And damage.
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