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.
3,876 total hits, 4 hits today
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.
3,257 total hits, 5 hits today
Reading time: 3 minute Among the main topics presented in this issue, we list: PC interface with digital analog inputs / outputs; Stabilized source 13.8V / 4A; Electronic, analog cipher; Frequency synthesizer - VHF (IV) - Elements of practical realization, commissioning and final adjustment; 4W amplifier - with MOSFET transistors;
920 total hits, 1 hits today
Reading time: 4 minute Among the main topics presented in this issue, we list: Universal USB interface - Velleman K8055; LM3876 - Audio Power Amplifier SeriesHigh-Performance 56W Audio Power Amplifier w / Mute; Electronic thermostat; Access control keypad for electronic lock; AVR (II) microcontrollers - description and use; Liquid crystal displays - LCD; ICL7660 and MAX1044 - CMOS voltage converters with switched capacities.
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