What is the TL431 and how it works. Circuit examples for fixed value voltage or variable output. See the schematic and components.

I've made another Bluetooth Speaker but this time is stereo, fully wireless, rechargable and obviously, portable. See the schematic part list and how to assemble the speakers.

Circuit and PCB for a homemade plasma speaker made with a Flyback transformer. Create plasma arcs and play music as a speaker.

How to make a homemade battery management system BMS circuit to balance and charge Lipo and Li-Ion batteries pack. We start with 1S and then 3S charger.

I’ll show you how to prepare the design, how to order the panel board service from PCBWAY, how to use the SMD stencil, add the components, reflow the PCB and give a proper test to each PCB and make sure they are ready for sale.

Simple RF circuit for analog video signal using small spy cameras that could even fit inside a screw. The circuit is simple with an LC tank resonator and other smal compoonents.

Simple circuit homemade ESC with half MOSFET bridge for HDD brushless motors with 4 inputs. Controller with ATtiny and Arduino code. Without back EMF.

Latch circuit for the microcontroiller to perform a push notification. Turn on and then off with 0 power consumption. Perfect for using the altch with sensors.

Simple latch circuit that will turn 100% ON when we push a button and then 100% OFF when we push the button again. Use this configuration with a sensor instead of a push button and you get a low power detector that only consumes power when is ON and then ahs 0 power consumption.

The air conditioner in a central heating and cooling system provides cool air through ductwork inside your home, by providing a process that draws out the warm air inside, removing its heat. ... From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat.

See the schematic of the power transmitter and receiver for a homemade wireless charger. The circuit automatically adapts teh resonating frequency with the load. Also see some tests.

See the schematic of a high voltage boost converter for NIXIE tubes with the MAX1771 driver. This can boost voltage from 5V to 170V. Circuit and results.

See how the electronic ballast circuit works, what components it has, how to create the high frequency high voltage and more...

See how the ballast circuit works, how to create the current path, how the tube glows with mercury inside and more...

See how to make the 3D printed case, make the circuit, amplify sound and select speakers, receive music from Bluetooth transmitter and make the homeamde headphones.

Arduino analog output with low pass filter and amplifier for voltage control with PWM signal and capacitor. We use the LM234 or the LM358 with PWM signal from Arduino and low pass filter.

How to set the output voltage of the LM317, resistor calculator and configuration settings. Current limit and more!

See the circuit of this project, the part list we need with links and then the entire process of making the smoke machine. It works at 220V AC and it is very powerful!

Here you can see how to make the analog version of a homemade constant load/current controller. Be able to set current values down to 0.01mA. Show the setpoint and real value on an LCD using an 16 bits ADC.

A PCB that has all the ICs on it to charge a 3.7V Li-Po or Li-ion battery but also protect it for over charge/discharge, short circuit and the PCB also has a 5V and 12V boost converter output.