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: 2 minute A cheap charger for charging batteries with Ni-Cd or NiMH elements is easy to build using the 555 timer and a few transistors. Charging is done quickly, and the electronic scheme ensures the elimination of the unwanted memory effect in NiCd cells.
Reading time: 2 minute The electronic DIY project presented uses power transistors at the output ("H" Bridge Output Stage), but in the TO92 capsule. The control part, Signal Generation Circuitry, is built with 2N2222 transistors. The speaker, connected to the Output, must have an impedance of approx. 6 Ohm.
Reading time: 9 minute Among the main topics presented in this issue, we list: Linear voltage regulators; Low cost charger for NiCd and NiMH elements; Keyboard with conversion from decimal to BCD; Vu-meter with transistors; Switch-detector for minimum load supplied in alternating current; FM transmitter microphone - for the band 88-108 MHz with a single transistor; Using an LED as a photodiode (light detector); 1W audio amplifier with TDA7052.
Reading time: 5 minute This vintage DIY electronic kit is a light organ with 3 projectors (bulbs), with the light effects rate adjustable by a rotary knob. The bulbs will light up depending on the intensity of the input signal and its frequency, producing special lighting effects.
Reading time: 3 minute The assembly is easy to do, being practically an interactive electronic kit for children. The scheme of this vintage DIY electronic kit consists of two stable tilting circuits (CBA).
Reading time: <1 minut This project can be considered a remarkable concept as it is based on a single active component. It can also be considered a logic circuit that requires few components.
Reading time: 2 minute The project presents a simple, exercise circuit for novice electronics, adjusting the light intensity of the LED with a potentiometer through two transistors.
Reading time: <1 minut The project is probably one of the simplest electronic circuits for novice electronics. It uses only 5 electronic components, the adjustment of the light intensity of the LED being done with a potentiometer by means of a transistor.
Reading time: <1 minut The project has a simple circuit that turns on the light automatically at night. It is based on 2 NPN transistors (BC547) used in Darlington configuration, and a photoresistor. With the help of a potentiometer, the light sensitivity of the LDR photoresistor can be adjusted.