請教圖中的多轉VR是調教什麼的?

如果將全部電阻換過需要調教嗎? 謝!

Please refer to the datasheet page 2

1. Recommended Operating Conditions
➀Add a variable resistor (VR) between diode terminals to adjust the idling current. The
resistor having 0 to 200Ω is to be used.
➁Adjust the forward current flowing over the diodes at 2.5mA.
➂Adjust the idling current at 40mA with the external variable resistor.

部機的白色水泥電阻係0.25ohm但找不到,我見這圖用0.22ohm ,咁用0.22ohm得唔得? 謝!

得嘅，但係換着0.22之後工作電流會變大少少，可以根據需要調整藍色個嗟VR到原來設置嘅數據。原來嘅工作電流可以用電錶測量白色水泥電阻兩端的電壓後計算出來，咁樣你可以代換0.22嘅電阻值計算到新裝電阻上嘅壓降系幾多。
根據過去唔多嘅一點經驗來看換着0.22之後啲聲都有可能會偏硬少少，咁這個電路究竟變化係點都需要試過先知。

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