Free electronic circuit design and schematic diagram
This is how to make crystal radio part two. This video explain how to assemble a crystal radio in ten minutes. This radio utilizes a different material from different manufacture. This radio use the internal part of radio. Then it is connected to the tuning coil. This part is build from the coil and ferrite and also tuner. The antenna […]
Read moreCrystal radio is a simple radio receiver that need no power source. It receives power from radio wave. This video shows how to make a crystal radio. This is first part that explains the parts of crystal radio. The parts of the crystal radio are the crystal, crystal earphone, coil, antenna, and earthing wire. The crystal is used to draw […]
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Compressor or AGC (automatic gain control) is used to manipulate the average amplitide of audio signal, to produce relatively constant volume of signal from high dynamic signal source. The 2N3819 JFET (which is used as a voltage controlled resistor) is the key component. Control voltage which is derived by full-wave rectification followed by a peak detector is provided by the […]
Read moreThis is how to make crystal radio part 3. In this video, a explanation of the variant of crystal radio is shown. This is two part radio. This radio has two wires, they are antenna and earthing wires. And between two of them there is a diode. The diode is used as bridge between that two connection. The earphone is […]
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This is a circuit of the open loop PWM controller using the NE5560. This controller is suitable for Switched mode motor drive. To get the best dynamic response, the switched-mode controller must be set consider to the motor electrical time constant and starting current. The motor has a peak current that must be carried by the transistor. Here is the […]
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The LM9070 is a 5V, 3% accurate voltage regulator which have 250mA low-dropout. The regulator has an active low delayed reset output flag feature. This feature can be used to reset microprocessor system on turn-ON and in the event that the regulator output falls out of regulation for any season. Before the reset output can return high, an external capacitor […]
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A schematic arrangement for a two quadrant controller is shown on figure below. This figure show us the outer speed control loop and the inner current control loop. The tachogenerator derive the speed feedback signal, although alternatively an approximation to the motor speed can be derived by feeding back a signal proportional to the motor voltage, (AVF). For servo applications, […]
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