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> [电子电路]光敏三极管组成的光控电位器电路
猫猫草
post 2008-03-17 10:57:29, Mon
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如图所示的光控电位器,使用激光笔做光源照射光敏管VT1,沟道电阻减小,音量提高;若照射VT2音量则降低,从 而实现了光控音量调节。该电位器每次开机时,VT3管的G极电位为0V,沟道电阻为最大值,音量也就被控制在最小。如图所示为一单声道,若需控制多个声 道,只需把场效应管G极并联起来即可。VT3选用3DJ6F或同类场效应管。VT1、VT2使用市售NPN型光敏管即可,C1、C2、C3选用6.3μF/25V钽电解电容。电阻选用1/8W金属膜电阻。
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