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: 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: 6 minute Among the main topics presented in this issue, we list: Proximity sensor (proximity); TC9153 (AP) - Digital volume controller, up-down; Folia Press'n'Pell (PnP) - Practical advice; Digital stereo volume controller with electronic up / down control; Speed variator for mini-drills; Voice separator for karaoke; Prescaler 1000MHz.
Reading time: 6 minute Among the main topics presented in this issue, we list: Indicator - universal controller for liquid level; Remote control receiver for switching electrical and household appliances; Motion control in both directions at a DC minimotor; Temperature measurement and recording on PC - using the iButton DS1820; Volumetric sensor (or broken glass detector); 2 x 3W stereo audio amplifier; Voltage stabilizer 1.25… 20V / 4A.
Reading time: 5 minute Among the main topics presented in this issue, we list: Measuring the electrical resistance of solders made with alloys without Pb or conductive adhesives; Performance indicator for "burned" fuses; Active switch for supply voltages; LM385 (B) - Precision fixed voltage reference source; Charger for lead-acid batteries (sealed); Balance indicator; Automatic / manual video switch; Speed regulator for AC motors; Sensory electronic switch - Touch Switch.
Reading time: 5 minute Among the main topics presented in this issue, we list: MC34064 - Undervoltage sensing circuit (power voltage monitor); Audio frequency amplifiers with TDA2822M; Universal siren module with back-up source; Dynamic lights and signaling arrow; 4-channel digital thermometer; "Flash" type light signals (beacons); Maintaining between two limits the water level in a tank;
Reading time: 5 minute Among the main topics presented in this issue, we list: Battery monitors; MC1496 integrated circuit; 2-zone alarm and / or fire alarm control panel; Voltage inverter - 24Vdc / 220Vac, 50 / 60Hz, 350W; Electronic timer with "start" and "stop" commands; Preamplifier - input trainer for frequency meters; Top 209/210 - TOPSwitch Family - Electronic MOS-FET switch with PWM control.
Reading time: 3 minute Among the main topics presented in this issue, we list: Twilight switch; Checking the MOS-FET transistors; Digital thermostat 0… 1000C with thermocouple; Dynamic lights with analog circuits; Programmer - 18-pin PIC application development board; Time relays;
Reading time: 4 minute Among the main topics presented in this issue, we list: Powering audio power amplifiers; Frequency synthesizer with uC - VHF - Elements of design and practical realization (I); PIC microcontrollers - Presentation and programming (V); Oscilloscope probe with 16 inputs; Dual source with back-up battery and timer; AC power regulator - 2kW.
Reading time: 4 minute Among the main topics presented in this issue, we list: Two-wire intercom - Full duplex; Alternative method of ultra-fast manufacturing of printed circuits (Toner Transfer System); Switching voltage stabilizers - LM2575, LM2576, LM2577; TDA8571J - 4 x 40W audio amplifier; 3 triac card (3 relays) with RS232 interface for PC; Automatic for cyclists.