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Reviews (2)
Sep 24, 2019
A tiny logic converter
I'm using it as logic converter to connect 5V signals to 3.3V especially on the esp8266 and esp32. Although there are very tiny and a bit difficult to solder the first time, they work very stable and so far I haven't had any problems with them. But when I only need one signal or want to use less space on the PCB or prototype board I just solder some of the transistors using two 10 kOhm resistors each instead of buying 4-signal logic converter which has these already soldered.
So I recommend these transistors for everyone with a bit of solder skills or hobbyist and a solder station with temperature control set to about 265°C.
Jan 03, 2020
ESP32 for a lot of useful things
Works well with ams1117 3.3 voltage regulator with smd 103 capacitors and 100 uF electrolytic near VCC GND. 12kOhm on EN and GPIO 0 are important. Power source is 1-2 Ampere 5V DC. Even soldering the esp32 chip on a small bread board or esp32 prototype board works great! Very stable.
For instance I've build a power monitor connected to a APC Power Saving Back-UPS, where power outages are received over an interrupt and then sent to my mobile phone via push notification.