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18650 battery holder allows easy use of lithium batteries in 18650 packaging. Otherwise, soldering these types of batteries is not recommended because the high temperature makes them lose their capacity. If you do not have a spot welding machine, we recommend that you get this kind of battery holder and you won’t have any problems with the loss of capacity, and it will allow you to use the batteries easily.

Reed switch is a switch that is activated within the range of the magnetic field. Within its glass capsule, it has two metal wires that will move when they are near the magnet and thus “activate” switch.

MMBT4403 is the PNP transistor of general use in SMT SOT-23 package. More details in the datasheet.

Set of cables designed to connect to the experimental board. These wires aren’t as flexible as our classic set of cables and they are cut in a variety of lengths. Using these wires, your breadboard will look very neat!

Vibration sensor SW-18020 is actually a switch that reacts (connects) to vibration, ie. moves. Thus, when a force acts on the sensor, it is connected, and when the force does not work, it is not connected.

e-radionica.com has created a module with an LM393 voltage comparator using this sensor. Check it out here.

 • Dimensions: 4.5mm diameter, 10mm high

LM358 is probably the best known and most frequently used operational amplifier. One pack contains two op-AMPs, but one can be used as a buffer, and one to increase its voltage. It is very convenient and easy to use. Also, this is a dual supply op-amp, which means you can turn up positive and negative voltages.

Protoboard used for the permanent connection (also known as soldering) of electronic components. High quality, with solder mask on both sides, as well as column and row markings.

Classical male header with 2.54mm pin spacing (0.1 ‘). 40-pin.

The AMS1117-3.3V is a linear voltage regulator designed to provide a stable 3.3V output from a wide input voltage range of 4.4V to 12V. This component is perfect for powering sensitive electronics, microcontrollers like Arduino boards, and various IoT devices that require a consistent 3.3V supply. Its design ensures efficient power conversion, making it a great piece for both hobbyist and professional electronic projects.

Packaged in a compact SOT-223 SMD form factor, the AMS1117-3.3V is suitable for space-constrained applications. It delivers a maximum output current of 1A, providing ample power for most low-power digital circuits and sensors. The simplicity of its operation, combined with its high performance, makes it an excellent choice for designers looking for an effective voltage regulation solution.

Our AMS1117-3.3V regulator comes with technical support and a 2-year warranty. Whether you’re building a new prototype, repairing existing equipment, or integrating it into a complex system, this voltage regulator provides the stability and performance you need. Detailed specifications and application notes are available in the datasheet for seamless integration.

25x 330ohm resistor (for LEDs)

15x 10k resistor (pull-up/pull-down)

They say that whoever works – makes mistakes. Well so do we! We have an old circuit board that we rest from unsuccessful projects or are simply a bug. There has excess PCBs of prototype products or serial products that are no longer manufactured. You will find everything, not necessarily functional 🙂

Use these chips to practice soldering on them, like a keychain or decoration for the wall. Give them to a friend. Make your next project on them. Let your imagination run wild 🙂

Note: Do not take these printed circuit boards as functional. We can not offer technical support for them. Some of them may have a number of brazed components.

Classic NPN SMD transistor.

Screw terminal for PCBs with a width of 3.5mm pin with two contacts.

Micro-USB SMD connector for soldering to the printed circuit board. The same as it’s used to Croduino Nova, CP2102 USB to UART adapter.

For those who do not want to waste time setting up the amplifier, we have made a module for you! TDA7397 located on this plate is a two-channel power amplifier with 15W per channel (with a peak of 25W!). There is also a potentiometer on the product to adjust the volume directly between channels.

The classic Micro USB cable which fits most modern Android smartphones, but also our new development boards.

ESP8266 is an IC that delivers a true revolution in the world of makers, especially in the world of IoT (Internet of Things). This is a complete 32-bit SoC (System on Chip) with built-in flash memory, frame and EEPROM which can even be programmed directly from the Arduino interface, without the need for additional micro-controller. With all this, the most important point is that in itself has a built-in WiFi (AP, STA, AP + STA), all that for “little money”.

ESP8266 in this form (ESP-12) is suitable for direct soldering to a printed circuit board as an SMD component or directly solder the wires since the pin has its holes. It also comes with a PCB trace antenna.

Note: ESP8266 is an IC that works at 3.3V! Connecting directly to 5V, or track Arduino or Croduino plate will destroy it! Use logic level converter.

Commonly used in a ceramic capacitor performance – Capacitor 100nF always come in handy 🙂

5mm RGB LEDs in a classic through-hole version with 4 pins. Each one representing one color (+), while the longest pin being a common cathode (common negative) for all three colors.