Б5-44, часть 3 - ремонт ИОН, улучшение термостабильности, настройка коррекции, замена реле ЦАП

Support the channel: 4100 1111 8764 9602 (yoomoney)! The saga of replacing the power supply toggle switch continues. In a perfectly functional B5-44 DC power supply, also often referred to as a linear laboratory power supply, the toggle switch handle accidentally broke. During the replacement process, a simple repair gradually evolved not only into in-depth preventative maintenance, but also into a bit of collective farming, as well as adjusting the characteristics for maximum precision. In the third part, we'll repair a shorted ION voltage regulator, replace ION components to improve its thermal stability, compare the thermal stability of the K140UD1B and K140UD7 operational amplifiers, analyze the effect of printed circuit board traces on the thermal stability of zero voltage and current, replace all relays, and compare the idle power consumption before and after relay replacement. The B5-44 DC power supply is a linear compensating DC voltage regulator, combined in parallel with a linear compensating DC voltage regulator. The output voltage is adjustable from 0 to 29.9 V in 0.1 volt steps. The output current is adjustable from 0 to 999 mA in 1 milliamp steps. Due to the absence of any switching circuitry, the B5-44 power supply provides extremely low output ripple and noise – in voltage regulation mode, ripple does not exceed 3 mV at full load. Equipment and materials used in the video: B5-44 power supply - patient; XJW01 RLC digital meter (off-camera); HP 34401A voltmeter; Robiton PM-3 wattmeter; MAS838 multimeter with "Type K" thermocouple; Oscilloscope C1-77; Alarm clock Granat PT109; Banana plugs, alligator clips, and probes; Microsoft Excel .2010 spreadsheets.