Activity for Chupacabras‭

Type	On...	Excerpt	Status	Date
Question	—	Matched transistors There are circuits that require matched transistors. Whether BJTs or FETs. Like current mirrors, logarithmic amplifiers, etc.. There are some examples: https://www.youtube.com/watch?v=DUlugLSroN8 https://www.youtube.com/watch?v=QY48IQXJIRI https://www.youtube.com/watch?v=RpKEq5WyoLg ... (more)	—	2 months ago
Question	—	Meaning of some components around voltage reference in SMPS I have generated flyback convertor schematic by TI's Webench Power Designer. Parameters: - universal AC input (85-265V AC) - 5V, 2A output - isolated - UC3843A controller Basically I understand flyback topology, but I do not understand the function of some components around voltage referenc... (more)	—	almost 3 years ago
Question	—	Name of this current limiting device I'm trying to modify a LED torch, and there is a DC-DC booster (1.5 V to 3.3 V) and after that some SOT-23 device which (I assume) keeps constant 90 mA current through LED. I know I could remove that device and replace it with a resistor, but that has disadvantage that current won't be as stable with... (more)	—	about 3 years ago
Question	—	PCT2075 temperature sensor accuracy I read datasheet for PCT2075 temperature sensor and there are some contradicting data about accuracy for me. Page 21: accuracy ±1°C (Tamb = -25°C to +100°C) accuracy ±2°C (Tamb = -55°C to +125°C) Page 23: figure 24 looks much better than those numbers. The accuracy looks like ±0.3°C ov... (more)	—	over 3 years ago
Question	—	Switch-off time of relay with flyback diode When switching a relay there should be a flyback diode. It could be just a diode or diode with resistor in series. I understand there is a difference in the speed of relay switch-off. But what is the difference really, how to calculate it? Example in this answer: https://electrical.codi... (more)	—	almost 4 years ago