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How many ohms?
10/01/2026

How many ohms?

Calculate the Total Voltage?
10/01/2026

Calculate the Total Voltage?

Charge/discharge indicator circuit for 18650 batteries: red light for charging, switches to green when fully charged. Si...
09/28/2026

Charge/discharge indicator circuit for 18650 batteries: red light for charging, switches to green when fully charged. Simple components—a DIY lithium battery charging indicator!

A sound-activated LED strip circuit using the TIP31C transistor. It runs on 12V power, picks up sound via a microphone, ...
09/28/2026

A sound-activated LED strip circuit using the TIP31C transistor. It runs on 12V power, picks up sound via a microphone, and features a potentiometer to adjust sensitivity—a fun DIY project for sound-controlled lighting!

A voltage regulator circuit using the 2SC5200 transistor: accepts 12–24V input and provides a stable 5V output. Built wi...
09/28/2026

A voltage regulator circuit using the 2SC5200 transistor: accepts 12–24V input and provides a stable 5V output. Built with discrete components, this simple regulated power supply makes for a great case study in analog circuit design!

What is this?
09/27/2026

What is this?

09/24/2026

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