Free electronic circuit design and schematic diagram
The most used is single-phase induction motors. This motors operate with a single phase power supply, only have one stator winding and are also squirrel cage. The motor is not self-started when connected to power supply because of the single phase. The motor only vibrate and not rotate because the necessary torque is not generated. Most single phase motors have […]
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A two tone effect very much alike cuckoo sound is generated by this circuit. We can use this circuit for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator, it can be connected to external amplifier, tape recorder, etc. The built-in audio amplifier and loudspeaker may be omitted and the output […]
Read moreBelow is video tutorial about how to make a device to hear through the wall. or called Spy Stethoscope. To make this device we only need a stethoscope and multimedia microphone. Using this device, we can heard a sound that could not be heard. To make this device, first disassemble the microphone then put the microphone into the earpeaces of […]
Read moreBelow is “make a portable spy scope” video tutorial. This video explained us about how to capture an image in long distance. If your camera zoom is not big enough, this is the solution. What we need only a cellphone (have camera feature), binocular, 2 tripods, binocular holder, and belt clip. To assemble the device, put the binocular into the […]
Read moreThe video below explains us about the load sharing issues in SMPS (switched mode power supply) design. This video tell us that load sharing connects the load with more Power Supply together to empower the load. Usually there more modules with more total power capability that required by the system. If one power module failed, remaining module continue to supply […]
Read moreMini electronic devices require multiple supply voltages to protect their circuitry. If this supply voltage are improperly applied, it can resulting distracted process where internal conduction junction become biased, resulting an uncontrolled current flow. There are 4 methods of Power Supply sequencing. There are simultaneous, sequential, ratio metric and offset. We have to chose the method that meets system requirement.
Read moreThis is EMI Filtering video. This video explained us about EMI Filtering, EMI Filtering Element, and EMI Filtering Leakage Currents. In this video, conducted mode RFI limit is illustrated on the diagram. On that diagram, the RFI has fix bandwidth. It’s claimed 9 KHz wide when scanning from 150KHz to 30MH and turning 20H when scanning below 150KHz. EMI filtering […]
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