now did not experience any changes. Some say this series is good, but
the series was good fitting assembly and tested the results are not as
The problem is usually treble is
less subtle, less sound, sound breaking, buzz, middle of the field
tested the bass sound is lost. so you do not have to believe what people
100%. The quality amplifier built-up would differ greatly with the
amplifier assembly, a series can be the same but the quality will depend
on who manufacture it.
Here are a few tricks to try
How to cope with a buzzing sound
amplifiers are often used in the field blazer. This circuit is said
said person is a bell assembly. But you do not immediately interested in
this power, the circuit rather complicated and difficult to understand
reflect the intelligence of people who first mendisainnya. In my opinion
a great power is the power of simple, inexpensive, easily assembled and
rational. You do not need to use expensive components such as the price
of tantalum capacitors, power mosfet and the other expensive. This does
not determine the quality of the power amp so that we raft. Power of
sometimes causing buzzing, to overcome that is by holding the line input
jack ground to the ground with 10-22 ohm resistors. So do not just take
the ground input from the ground but held first with the R 10 ohms.
How to setting bias trimpot
the trimpot bias (if any) until the drain current of 50-100mA on each
power transistor, in order to avoid defects treble in volume in the top
position at 10. The risks are so panassss heatsink! (This setting marks
on plate A-AB)
Offset trimpot setting
the time of input without a signal, turn the trimpot so that the
voltage on the speaker offsets actually read 0 volts. If you do not want
to bother, use and entrust it with ic type series from Hitachi HA17741
IC brand quality or other! This is the heart of the series, 90-95% of
quality is determined from the IC circuit this!
Overcoming the voice
pre-amp circuit to increase the signal of at least 2 times. normally
and should pre-amp circuit uses IC op-amps with 12 V minimum
supply-12V. Raise his mid tone!
If hard you do not want to just use the tone control circuit IC is his mid!
The secret is not in his mid tone alone, but the signal output from the IC op-amps are usually large.
treble will damage the power amp, power rather than out even ngedrop.
Handle, attach the filter capacitor on the input 1NF power amp to ground
to ensure the signal is not disabled. Always use a quality active
components such as ICs and transistors, 500 price difference will also
be different results.
Use a large cable and
short as possible, especially for leg power transistor, and this
transistor should be directly soldered to the pcb.
Missing bass in field
power for field use supplay CT 50V 50V transformer, or at least 42V 42V
ct. The greater the greater the supply voltage watt channeled though
the series is written only 300-400 Watts only. This course uses Elko
capacitors with voltage 80-100V. 10.000uF/100V capacitor will be equal
to 4X10.000uF/50V and of course voltage capacitor is filled with full /
Try to use a strong Elko at
temperatures of 105 'C. Capacitors are strong in supply of more than
nominal voltage is written on his body. For example 4700uF/50V 85'C
capacitor will quickly explode in voltage 51V 85'C. And Elko will be
strong 105'C 4700uF/50V voltage supplied more than 50V at a temperature
of 85'C. Elco so that it does not quickly explode if given the full
voltage, keep its temperature as cold as possible, fan with the cool
using a driver speakers that have a large spool diameter fitted with a
suitable size bok. Usually included examples of the parameters /
dimensions bok. Size bok bok2 usually larger than that sold in the
market. if you force using bok that from this market, use driver type
G12-80 (sorry no fear brand called promotion) speakers with bass tones
to wall size small. Bok wall should be thick, strong and do not forget
glued! Bok who will not be glued with a different sound, especially bass
tones, prove it!
form of transistor, the transistor is usually type BD139 MJE340 or it
could be located in the center, flanked by a pair of transistors having a
certain equal. These transistors must be mounted on the main heatsink
to detect the heat generated by power transistors. It acts to lower bias
currents at the hot heatsink. So what heatsink and power transistors
must be set diposisi hot? Yes objectives nothing to prevent the signal
from the defect (in class A or AB), with consequent heat. This class is
not necessary and will not be felt if you only want the bass tones only.
Goal setting on. AB grade is still crystal clear sound even though the
maximum volume positioned rotated (in the middle of the field).
It is unlikely, but it's closer.
only electrolytic capacitors are more explosive at high temperatures,
power transistors can also break away under stress break the original.
For example 2SC5200 transistors have the break voltage of 230Vdc, but if
temperaturya high voltage values will break his fall well below this
value, resulting in faster transistor is damaged. Use of heatsink and
cooling fan is very important not only to reduce the heat, more than it
can prevent the transistor from break / damaged and weakened output.
Increasingly hot temperatures will be more or less ability. Use of this
cooling is expected for the components remain fresh, fit and durability.
are so many types and models of these transistors, for example MJ15003
MJ15024-4 and-5 from Motorola, but unfortunately these components are
not manufactured by Motorola again but from ON semiconductor. Transistor
model jengkol usually stronger in the high temperature, probably due to
more airtight. 2SC5200 from Toshiba, this transistor is equal
dalamannya Sanken 2SC2922 Korea, and both will break if the temperature
is too hot. 2SC2922 Sanken issued tin granules when heated, this
weakness, the Japanese technology is better than Korean technology.
2SC3281, this transistor is the most popular and frequently used in
professional amplifier, but Toshiba does not produce much, if still
there in the market, then it most likely is fake!
are two models of the transformer which is often used, namely EI model
(box / conventional) and the model toroid (ring / donut). Some say the
toroid transformer model is better because it has a smaller flux leak,
in fact the same. Circuits that are sensitive to this flux is high
berpenguatan circuits like pre-amp head and mic pre-amp. The circuit is
usually installed horizontally / flat parallel to the structure of a
conventional transformer wire so that a series of emails received
reverberation is greater. Unlike the model toroid transformer is
arranged in a vertical wire their email so that the wires are
perpendicular to circuit kits The effect is the flux of the pre-amp kit
receive a smaller head. To solve for this flux does not enter the series
is by downloading shelding / fortified with non-magnetic plate such as
aluminum plate and copper plate / sheet pcb board. Plate is of course
connected to ground via a cable. To match the flux in a vertical
transmission, the conventional transformer needs to be installed side
(the side be side down) so that the arrangement of transformer wire
stand upright, this method is often used in built-up POWER2. Voltage 50V
50V CT can be obtained by combining the two transformer 25VCT25V, CT is
not used, the foot 25V 50V so that the legs be made only to CT,
bringing the total number is 100V or 50VCT50V. It deserves used for pwr
amp powerless over 400Watt.
Resistor 5 Watt
on the power transistor legs are usually valued at 0.5 ohm 5 Watt white
square. If we dismantle dalamannya it appears there was a circular
aluminum wire. It resembles the inductor, the inductive reactance
inductor will be higher when fed a high-frequency fractions so that
treble tone will be weakened and deformed. Power required to remove the
high notes (treble) of course greater, there is a problem here. The use
of R 0.5/5W on its home-based power amplifier ok-ok only. But often do
not realize the cause of damage to the speakers and power amplifiers is
the high treble tones. Treble is not out but was hit by a pwr amp so
arising is hot and damaged. We recommend using common Watt resistor 2
12:47 - 1 ohm parallel 2 so that counted 4 Watt. Or if you use 0:22 ohm 2
Watt Resitor unnecessary because the voltage clamp diparalel quite half
(one R 0.5/5W replaced one R 0.22/2W) its ok.
to semiconductor materials / transistor power amplifier is short, if you
use a supply that is high enough then the destruction of these
transistors will invite their partners to be damaged as well. In order
for the destruction of this transitor congregation not need the
installation of fuses. 1.5A per power transistor is considered