为了解决冬季洗片加温问题,我科制成自动控制液位的电子恒温器。其元件易购。制作简单,性能稳定,经济而安全,今介绍于下。一、原理图1 自控液位电子恒温器原理示意水池温度低于电接点水银温度计20℃以下时,其水银触点断开,三极管BG的基极由基极电阻R和浸入水池中的基极引线W得 In order to solve the problem of warming the winter wash, I made electronic thermostat with automatic level control. Its components are readily available. Production is simple, stable performance, economic and security, introduced below. First, the schematic diagram of the principle of 1 electronic control thermostat level thermostat pool temperature below the electrical contact mercury thermometer below 20 ℃, the mercury contacts open, the base of the transistor BG by the base resistor R and base immersed in the pool Wired lead