Car stereo speaker project illustrated by Daniel Ferguson

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By Daniel Ferguson

Проектирование и построение автомобильных акустических систем продолжают быть комбинацией искусства и науки.
В этой книге описаны 20 полных иллюстрированных проектов акустических систем для разных видов транспортных средств.
Шаг за шагом, от проекта до монтажа.
Доп. информация: Язык: англ.

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Example text

6 pF. 0 MHz . I n this example we use 29 4 MHz as the upper freq ue ncy. Thi s res ults i n a ca pa cit ance of 49 pF f or an C1 s hou ld not be requ ired e xce pt in t he XL of 800 , wh ic h i s 4 X 200 ohms. most critical of amp lif ier circuits. We shoul d us e transis tors t hat have a hi gh fT and be ta whe n buil din g br oadban d amp l if iers . The 2N5179 , for example , has an fT of 1200 MHz an d a s ma ll-s igna l beta (hfe) of up t o 300. Q2 in Fi g 2- 10B i s ad ju ste d for a no- sign a l coll ector c ur r e nt of approx imat e l y 50 rnA.

Cl + C2 + 6 1 15] [ C3 + +C Eq. 2- 1 wh er e C is in with Cl, the VFO ope rat i ng det e r mine t he C~ pF and 6 i s main-tuni ng frequency . re quired Ll the appr ox i mat e in put c apa ci t anc e of a J FET. Thi s is c apac it or, full y meshed f or operat io n at the l owes t Once th e t ot a l effect ive cap acitan ce i s know n you c an induct anc e fr om Eq . 2-2 L(}JH ) ; [nf f] 2 X C(p F) An NPO ce ram ic or muRata NPO plasti c t ri mme r may be placed i n paralle l with Cl to aid in VFO range c a l i br at i on .

3 r d , 5 th, 7 th . e t c . 34 The Pi erce osc illator i n Fi g 2- 13A depends upon C1 and C2 for f eedback control. The feed back path is thro ugh Y1, f r om th e Q1 dr ain t o it s gate . C1 and C2 are chosen to provide only th e fe edback needed to sus ta i n osci llation. The capaci to r val ues ar e sometimes equal, as shown , but C2 is frequently mu ch larger t han C1. Thi s depends on t he crysta l acti vity and th e tran sconduc tan ce of t he FET . Val ues as small as 15 pF may be used at C1 and val ues as large as 1000 pF can be used at C2.

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