Search This Supplers Products:PCB manufacturerPCB AssemblyCarbon PCBCeramic PCBFPC AssemblyElectronic Component
Printed circuit board connection between the various components of arrangement
time2011/11/17
(1) Printed circuit board are not allowed in cross circuit, that may cross the line, you can use the "drill", "around" two kinds of solution. That is, to a lead from the other resistors, capacitors, transistors gap at the foot of the "drill" in the past, or may cross from one end of a certain wire "around" In the past, in exceptional circumstances, how the circuit is very complex, to simplify the design allows the use of jumper wire, cross-cutting circuit problem.
(2) resistors, diodes, capacitors and other components of a tube, "vertical", "horizontal" two installation methods. Vertical refers to the components of the body perpendicular to the circuit board mounting, welding, and its advantage is to save space, refers to the horizontal components of the body parallel to and close to the circuit board mounting, welding, and its advantage is that the mechanical strength of components installed is better. Installation of two different components, printed circuit board assembly pitch is not the same.
(3) the circuit with a ground point should be as close as possible, and the circuits of power supply filter capacitor should be connected on the level ground. In particular, the level transistor base, emitter to ground is not too far away, or due to take place between the two copper foil is too long may cause interference with the self-excited, the use of such a "little ground law" circuit, work is more stable, easy to self-excited.
(4) Printed circuit board ground wire must be in strict accordance with the total frequency - IF - low a level to power by weak to strong principles of order, must not just Fanlaifuqu random access, level and grade wiring length between the would rather be point, we must comply with this provision. Particular frequency head, head regeneration, FM head ground wire arrangement requires more stringent, if properly will produce self-excitation which does not work.
FM is often used first-class high-frequency circuit-style surrounded by large areas of ground in order to ensure a good shielding effect.
(5) high current leads (public ground, amplifier power leads, etc.) should be as wide and more, to reduce the wiring resistance and voltage drop reduces the parasitic coupling arising from the self-excited.
(6) Printed circuit board with high-impedance traces short, low impedance traces can be longer because of the high impedance of the trace is easy to send flute and absorption signal, causing circuit instability. Power lines, ground, no feedback component traces the base of the emitter wire, etc. are low impedance, emitter follower base alignment, tape recorders, two-channel ground must be separated into their respective all the way until the end effect and then together, such as two-way connection to connect to earth, easy to produce crosstalk, so that the separation decreased.
(2) resistors, diodes, capacitors and other components of a tube, "vertical", "horizontal" two installation methods. Vertical refers to the components of the body perpendicular to the circuit board mounting, welding, and its advantage is to save space, refers to the horizontal components of the body parallel to and close to the circuit board mounting, welding, and its advantage is that the mechanical strength of components installed is better. Installation of two different components, printed circuit board assembly pitch is not the same.
(3) the circuit with a ground point should be as close as possible, and the circuits of power supply filter capacitor should be connected on the level ground. In particular, the level transistor base, emitter to ground is not too far away, or due to take place between the two copper foil is too long may cause interference with the self-excited, the use of such a "little ground law" circuit, work is more stable, easy to self-excited.
(4) Printed circuit board ground wire must be in strict accordance with the total frequency - IF - low a level to power by weak to strong principles of order, must not just Fanlaifuqu random access, level and grade wiring length between the would rather be point, we must comply with this provision. Particular frequency head, head regeneration, FM head ground wire arrangement requires more stringent, if properly will produce self-excitation which does not work.
FM is often used first-class high-frequency circuit-style surrounded by large areas of ground in order to ensure a good shielding effect.
(5) high current leads (public ground, amplifier power leads, etc.) should be as wide and more, to reduce the wiring resistance and voltage drop reduces the parasitic coupling arising from the self-excited.
(6) Printed circuit board with high-impedance traces short, low impedance traces can be longer because of the high impedance of the trace is easy to send flute and absorption signal, causing circuit instability. Power lines, ground, no feedback component traces the base of the emitter wire, etc. are low impedance, emitter follower base alignment, tape recorders, two-channel ground must be separated into their respective all the way until the end effect and then together, such as two-way connection to connect to earth, easy to produce crosstalk, so that the separation decreased.