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: 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 the transistor-based replacement version of the CMOS 4069 integrated circuit. The assembly interrupts another circuit or electrical charges without timing.