电阻器(R)必须足够大，以限制流过二极管的电流，使之不会损坏二极管。
The resistor (r) must be large enough to limit the current through the diodes to prevent damage to the diodes.
用差动放大器对轴承式检流计进行改造，使之具有灵敏度高、不易损坏、可直立放置等优点。
A bearing galvanometer is modified using a differential amplifier. It has the advantage of high sensitivity and is less likely to damage and able to be put upright.
应用推荐