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Free Electronic ProjectsElectronic hobby projects, Electronic circuit, Circuits, Hobby circuits, Digital circuits, digital e...Digital clock circuitOne , designed to 1 . familiar with the IC 's pin arrangement . 2 . to acquire all the chip logic fu...Serial Interface Keyboard Controller circuitSK5278Abstract : SK5278 is a managed 16 key keyboard controller , the device has to shake the internal pro...IPM drive and protection circuitp> Abstract: This paper introduces the basic operating characteristics of the IPM and the IPM...Power supply switching protection circuitAbstract: In order to switch to emergency power failure in the harsh environment and safe conditions...Inverter circuit board and maintenanceA common style car on the market the main indicators of inverter products Input voltage: DC 10V ~...Simple short circuit tester coilsUsing the 555 integrated timer. Add a small amount of external components, can be made simple and pr...Quick Introduction to Voice Trilogy Integrated CircuitsBasics Young enthusiasts started his electronic technology, we might start with the most innovati...LM567 Universal tone decoder integrated circuit applications567 for the general tone decoder, when the input signal in the pass band to provide saturated transi...DC motor control circuit-4Commutator permanent magnet DC motor, is a very broad application. Just add the appropriate voltage ...Miniature DC Motor Drive Test Analysis circuit1 Introduction DC motor is the first invention can convert electrical energy into mechanic...Relay control circuit module and the principleCan directly promote the work of the CMOS integrated block circuit relay Circuit in the electroni...Cable duplex intercom circuit Figure 1 is a fan-made electronic cable for duplex intercom (intercom wired telephone can be...Optocoupler drive circuitFirst, the circuit using optocoupler Why? Electrical isolation requirements. Between A and B circ...Ultrasonic transmitter - receiver circuits40kHZ ultrasonic transmitter circuit (1) 40kHZ one ultrasonic transmitter circuit, the F1 ~ F3 thr...Simple high-power LED driver circuit (light flashlight circuit)C4 is the capacitance of the ceramic capacitor 473!! D3 1N5819 refers to two parallel!!! Simple high...Simple cellular phone or camera flash lighting circuitOverview Next-generation cell phones will have a high quality camera. With the improvement ...Serial interfacing circuit with S by R circuit and dual-axis magnetic field sensor application circuit (integrated magnetic sensor HMC1002)Application of dual-axis magnetic field sensor circuit as shown. Using a two-axis magnetic sensor HM...Negative feedback circuit using AD827 or OPA2604 or NE5532 based high bass tone circuits for schoolsThe role of tone control circuit is used to adjust sound to conform to requirements of a variety of ...RS232 connection circuit using ordinary transistor circuitSimple RS232C Level Converter using Transistors There're many, who built the Easy Programmer or C-...