Taste The Code

18650 Battery Tester Review: Measuring Capacity and Internal Resistance

Testing salvaged 18650 cells from old laptop batteries using a 4-channel tester to measure capacity and internal resistance on each cell independently.

Mar 28, 2026 — 5 mins read

Diagnosing and Repairing a SANKEI TCR95 Studio Mixer from the 80s

I opened up my mom's vintage boombox to bring it back from the dead. A bad switch contact and a possible short were keeping it from working at its full potential again.

Mar 20, 2026 — 5 mins read

Full Electrical Isolation for Your ESP32 Power Switch Using an Optocoupler

Using an optocoupler instead of a transistor in a custom PCB power switch gives full electrical isolation and removes noise from MPPT solar charge controllers.

Mar 13, 2026 — 5 mins read

Inside a Plasma Ball: Testing, Replacing, and Learning from Failure

I attempt to repair a USB-powered plasma ball by diagnosing a blown transistor, replacing it, and exploring why the lightning effect stopped working.

Feb 21, 2026 — 6 mins read

Building a Simple Indoor Asset Tracking System With RYUW122_DK

I set up an ultra-wideband asset tracking system using Reyax RYUW122_DK kit to precisely track an RC car's position in real-time.

Jan 30, 2026 — 9 mins read

Touch Control Made Easy: A Beginner's Guide to TTP223 Sensors and ESP32 Touch Pins

Learn how to add touch control to your DIY electronics projects using the affordable TTP223 sensor module and the ESP32's built-in touch pins.

Jan 24, 2026 — 8 mins read

How I Fixed a Broken Charging Port by Upgrading the Speakers to USB-C

Learn how I easily fixed two broken speakers by replacing the old USB port with an affordable USB-C breakout connector.

Jan 16, 2026 — 5 mins read

Building a Field Power Kit: Pairing the PocketPD with a DIY Battery Adapter

I built a simple portable power supply using tool batteries and PocketPD to get adjustable voltage for electronics projects anywhere.

Dec 30, 2025 — 6 mins read

Sensor Power Switch Using an ESP32 and P-Channel MOSFET

I walk you through the design and prototyping of a P-channel MOSFET switch controlled by an ESP32 to efficiently power external sensors only when needed.

Dec 14, 2025 — 5 mins read

How Much Distance You Can Actually Get From an nRF24L01

I tested the real-world range of two nRF24L01 modules, from indoor walls to open-field distances, to see how far they can actually communicate.

Dec 08, 2025 — 14 mins read

Taste The Code

18650 Battery Tester Review: Measuring Capacity and Internal Resistance

Testing salvaged 18650 cells from old laptop batteries using a 4-channel tester to measure capacity and internal resistance on each cell independently.

Diagnosing and Repairing a SANKEI TCR95 Studio Mixer from the 80s

I opened up my mom's vintage boombox to bring it back from the dead. A bad switch contact and a possible short were keeping it from working at its full potential again.

Full Electrical Isolation for Your ESP32 Power Switch Using an Optocoupler

Using an optocoupler instead of a transistor in a custom PCB power switch gives full electrical isolation and removes noise from MPPT solar charge controllers.

Inside a Plasma Ball: Testing, Replacing, and Learning from Failure

I attempt to repair a USB-powered plasma ball by diagnosing a blown transistor, replacing it, and exploring why the lightning effect stopped working.

Building a Simple Indoor Asset Tracking System With RYUW122_DK

I set up an ultra-wideband asset tracking system using Reyax RYUW122_DK kit to precisely track an RC car's position in real-time.

Touch Control Made Easy: A Beginner's Guide to TTP223 Sensors and ESP32 Touch Pins

Learn how to add touch control to your DIY electronics projects using the affordable TTP223 sensor module and the ESP32's built-in touch pins.

How I Fixed a Broken Charging Port by Upgrading the Speakers to USB-C

Learn how I easily fixed two broken speakers by replacing the old USB port with an affordable USB-C breakout connector.

Building a Field Power Kit: Pairing the PocketPD with a DIY Battery Adapter

I built a simple portable power supply using tool batteries and PocketPD to get adjustable voltage for electronics projects anywhere.

Sensor Power Switch Using an ESP32 and P-Channel MOSFET

I walk you through the design and prototyping of a P-channel MOSFET switch controlled by an ESP32 to efficiently power external sensors only when needed.

How Much Distance You Can Actually Get From an nRF24L01

I tested the real-world range of two nRF24L01 modules, from indoor walls to open-field distances, to see how far they can actually communicate.

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18650 Battery Tester Review: Measuring Capacity and Internal Resistance

Testing salvaged 18650 cells from old laptop batteries using a 4-channel tester to measure capacity and internal resistance on each cell independently.

Diagnosing and Repairing a SANKEI TCR95 Studio Mixer from the 80s

I opened up my mom's vintage boombox to bring it back from the dead. A bad switch contact and a possible short were keeping it from working at its full potential again.

Full Electrical Isolation for Your ESP32 Power Switch Using an Optocoupler

Using an optocoupler instead of a transistor in a custom PCB power switch gives full electrical isolation and removes noise from MPPT solar charge controllers.

Inside a Plasma Ball: Testing, Replacing, and Learning from Failure

I attempt to repair a USB-powered plasma ball by diagnosing a blown transistor, replacing it, and exploring why the lightning effect stopped working.

Building a Simple Indoor Asset Tracking System With RYUW122_DK

I set up an ultra-wideband asset tracking system using Reyax RYUW122_DK kit to precisely track an RC car's position in real-time.

Touch Control Made Easy: A Beginner's Guide to TTP223 Sensors and ESP32 Touch Pins

Learn how to add touch control to your DIY electronics projects using the affordable TTP223 sensor module and the ESP32's built-in touch pins.

How I Fixed a Broken Charging Port by Upgrading the Speakers to USB-C

Learn how I easily fixed two broken speakers by replacing the old USB port with an affordable USB-C breakout connector.

Building a Field Power Kit: Pairing the PocketPD with a DIY Battery Adapter

I built a simple portable power supply using tool batteries and PocketPD to get adjustable voltage for electronics projects anywhere.

Sensor Power Switch Using an ESP32 and P-Channel MOSFET

I walk you through the design and prototyping of a P-channel MOSFET switch controlled by an ESP32 to efficiently power external sensors only when needed.

How Much Distance You Can Actually Get From an nRF24L01

I tested the real-world range of two nRF24L01 modules, from indoor walls to open-field distances, to see how far they can actually communicate.

Topics

Search

Tags

How to Sort Salvaged 18650 Cells with a Battery Tester

Repairing a Vintage 80s SANKEI Boombox: Two Faults Fixed

Building a Better Power Switch for Solar-Powered ESP32 Projects

Can I Fix This Dead Plasma Ball with a Transistor Swap?