Reading time: 2 minute The electronic DIY kit presented is a simple and cheap bathroom lighting machine. The light turns on automatically when the bathroom door is open and stays on when it is open again, the lamp / LED going out after a short delay.
Reading time: 2 minute Although simple at first glance, the application stands out for its originality, a simple adjustment, limiting the maximum current debilitated in the load, in a wide range. The voltage stabilizer shown is a wide application of the LM317 integrated circuit.
Reading time: 3 minute The DIY kit shown is an AB class audio amplifier that uses the BA5406 integrated circuit produced by ROHM. Easy to make, with only a few electronic components, it can connect without problems to most signal preamplifiers or to the output of sound cards from the PC, its input impedance being high.
Reading time: 4 minute MAX712 (and MAX713, with very small differences) is a specialized integrated circuit for fast charging of NiCd or NiMH batteries from a direct current voltage source. From 1 to 16 elements (1.2V) connected in series can be charged, their number being programmed by hardware.
Reading time: 2 minute Comfortable and quiet, without introducing electrical noise in the assembly, compared to an analog potentiometer, the digital potentiometer presented is made with integrated circuits for general use (non-specialized).
Reading time: 2 minute There are many applications that require a simple, inexpensive and reasonable power amplifier for portable circumstances (trips). The TDA7052 is a very easy to build, battery-powered power amplifier with decent power for its size and simplicity. The article contains two construction variants of the 1W amplifier.
Reading time: 2 minute The installation presented is a simplistic one, its purpose being light detection and familiarization with the operation of operational amplifiers. The electronic circuit is based on the TL071 / LM741 IC and uses a 5V differential supply.
Reading time: 7 minute At IPRS Baneasa, the first NPN transistors (BC17x family) were developed by eng. Nicolae Camen and the first PNP transistors (BC25x family) by eng. Sorin Georgescu. The article contains the technical characteristics of all BC17x and BC25x transistors.
Reading time: 2 minute The NPN 2N2222 transistor is used in applications that require amplification of low currents and low or medium voltages. The article also contains macro pictures inside the transistor capsule produced by Motorola, ITT Semiconductors, CRP Industries, IPRS Baneasa and National Semiconductor.
Reading time: 3 minute Point diodes (like EFD108) can be considered the "ancestors" of Schottky diodes. They used to be called "Schottky microdiodes with germanium". Although constructive differs a lot, the operation is very close, the opening threshold is lower than the PN junction diodes with germanium (approx. 0.2V) and they do not have that "steep bend" in the opening area of the junction diodes.
