When reviving a luxmeter on a printed circuit board, there was a problem that the proposed connection is inoperative. The first option was quickly verified by measuring the printed circuit board with a multimeter. An error was found in the wiring. Grounding of MCP1258 was not connected to dissolved ground. The defect was fixed, but…
Deals with the design of a special security system in which, apart from the usual parts such as camera and motion sensor, a USB dongle will be used to send the recorded videos via UMTS or LTE mobile networks to the server where they can be viewed. Nowadays, when mobile operators offer unlimited tariffs and…
The solar cell powered back-up power supply should be as efficient as possible, it should be simple construction due to possible failures and should be reasonable sizes. The design of the charging inverter was based on the recommended connection available from LTC3536 drive datasheet, operating at 1.8 – 5.5 V input voltage I used the…
Many times we have been asked about an amplifier that can be powered with the computer source to amplify this. We have also seen the need for an amplifier that can be transportable everywhere and that provides an acceptable power service. Thinking about filling these expectations, we present a 20W stereo amplifier (10W per channel)…
The charger presented in the article is intended for charging the battery pack – LiFePO4 2S 1.8Ah with electricity from a photovoltaic cell. The charger is based on a LTC3652HV integrated circuit which is a universal battery charger controller, adapted to be powered from a PV solar panel. Recommendations: the charger is worth taking with…
The amplifier uses a hybrid two-channel IC STK4241-II manufactured by SANYO. Immediately, it is worth noting that the pinout of the STK4241 is compatible with such chips as the STK4201V-series (THD = 0.08%) and the STK4141-series (THD = 0.02%). In the archive for download you will find 5 technical descriptions (DATASHEET) on STK4201, STK4211, STK4221,…
Often there is a need to control the working time of the device powered by mains voltage. Different time switches are available in the market, but most of them require time-consuming configuration. In particular, when control is limited to an automatic shutdown after a set time, such solutions become ineffective. For this purpose, the described…
Dual, independent power supply, designed to polarize condenser microphones with voltage of +48 V. The built-in transformer and compact size of the board allow you to install the power supply in any electroacoustic device. Recommendations: the device will be particularly useful for constructors and service technicians of audio equipment and for testing microphones. It consists…
The aim of the project is to create a control unit, a controller, for the purpose of lighting the staircase. Stairs, respectively. each staircase is illuminated by an LED strip. The lighting responds to passing people and adequately evaluates the ambient light level. Parameters such as light time, light speed, length of light shine, etc.…
The output transistors MJL21194 are of great power and performance. They must be very well adjusted with through screws, washers and nuts and properly insulated from the heatsink with mica insulators. Remember to use silicone grease and tighten the screws very well, so that the heat is transmitted from the transistors to the heatsink. After…