?? 門鈴.ewb
字號:
Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description:
" 自41班 韓斌 學號:11 "
""
" 本電路為簡易門鈴線路。采用幾個晶體管組成簡易的電子門鈴,聲音適中,成本低。 "
" 圖示線路由自激多諧振蕩器,放大器,揚聲器和電源等部分組成。晶體管BG1和 BG2組成自激多諧振蕩器,R2 和R5 是它們的集電極負載電阻它們的基極分別經R4 和R3 及W1取得正向偏壓。兩個晶體管之間通過C2和C3進行交流偶合。當按下電鈴按鈕后,由于C2,C3交替地充放電,使BG1和BG2輪流導通和截止,所以無須外加觸發信號,就能產生一定頻率和一定脈沖寬度的矩形波。矩形波通過C1偶合到BG3進行放大,使揚聲器發出聲音。"
EncryptionType: 2
UsingVectorGraphics: 0
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