Printed circuit board wiring between the components arrangement
(1) not allowed in the printed circuit crossover circuit that might cross the line, you can use the "drill", "around" two kinds of solution. That is, to a lead from other resistors, capacitors, transistors, the gap at the foot of "drill" In the past, or may cross from one end of a lead article, "around" the past, in exceptional cases to the circuit is very complicated, to simplify the design permits the use of jumper wire, cross-circuit problems to solve.
(2) resistors, diodes, capacitors and other components of a tubular "vertical", "horizontal" two installation methods. Vertical component refers to the body perpendicular to the circuit board installation, welding, the advantage of saving space, the horizontal component refers to the body parallel and close to the circuit board mounting, welding, the advantage of better mechanical strength of components installed. The installation of two different components, printed circuit board component is not the same pitch.
(3) with a circuit ground point should be as close as possible, and the power circuit of the filter capacitor should be connected to the grounding point on the level. In particular, the level transistor base, emitter's location can not be too far away then, or because the two take place between the copper foil is too long may cause interference with the self-excited by this "point grounding method," the circuit, it is more stable, easy self-excited.
(4) Total ground must be in strict accordance with high frequency - IF - by weak low-level class in order to strong principles of electricity, must not lightly repetitious random access, level and class would rather be wiring length between the points, but also To comply with this requirement. In particular the first frequency, regeneration head, head of the ground wire FM arrangements more stringent requirements will result if improper self-excitation that does not work.
FM first-class high-frequency circuits often surrounded by large areas of ground type, in order to ensure a good shielding effect.
(5) Strong current leads (public ground, amp power wire, etc.) should be as wide and more, to reduce wiring resistance and voltage drop, can reduce the parasitic coupling arising from the shock.
(6) high impedance traces as short as possible traces of low impedance can be longer, because the alignment of the high impedance of flutes and easy fat absorption signal, causing circuit instability. Power line, ground wire, no feedback components to the base of the alignment, such as the emitter leads are low impedance, emitter follower base alignment, tape recorders ground of both channels must be separated into their own way until the combined effect of the end of another, such as the two connected to connected to the ground, easy to produce crosstalk, so that separation decreased.
