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How to make a servo tester using Attiny85 micro chip

Making a servo tester using an Attiny85 micro chip, Attiny45 also works for this project. This diy servo tester is as good as ...
Circuit Digest4d

How to build a Wearable Air Quality Monitor Pendant using STM32 & SGP40 Sensor

The audio component centers around the SS8550 PNP transistor (Q1) which serves as a driver for the passive buzzer (BZ1). This ...