Free electronic circuit design and schematic diagram
This motor driver circuit control the charging and power delivery cycles to enable small solar cell to drive dc motor. Here is the schematic diagram of the circuit: You have to make sure that 4700uF cap doesn’t leak, for more information about this solar cell dc motor driver circuit, you can see here.
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This motor driver deliver the power form capacitor to the motor when the capacitor is charged to 1.75V by the solar cell. After powering the motor, capacitor voltage will be discharged and the circuit will cut the capacitor-motor connection when the voltage drops below 1V, allowing the capacitor to be charged to 1.75V again to repeat the cycles. The motor […]
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A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins and they enhance battery life. Those features make this device an ideal candidate for controlling speed and direction in small electric motors. The standard application circuit for a class D audio amplifier is shown on […]
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This is an Automatic Cooling Fan Controller circuit. This circuit is very useful during summer to keep our important item and rigs such as VHF and UHF transceivers staying cool. Because VHF and UHF transceivers were sold with no cooling fans and oversized heat sinks. Here is the circuit: This circuit uses The thermistor, R1. It is the heart of […]
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Figure below shows us a PWM Speed DC Motor Rotation circuit. This circuit has two functions, Forward-Reverse and Regenerative Braking function. On this circuit, we can control the speed of DC 12V motor with Power Mosfet IRF150 using a signal PWM. The Relay RY1 work as control Reverse with the digital alarm, change Q10. The Relay RY2 work as function […]
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We can make an enhancement to DAC drive fan controllers with the use of an external amplifier that closes the loop around the tachometer. Essentially linear control over the full range of 8 bit DAC codes from 0 to 255 is provided by this enhancement. This only requires a little signal conditioning and a suitable amplifier arrangement since the tachometer […]
Read moreWe can simplified greatly the fan speed regulation design using a dedicated IC such as the MAX6650 or MAX6651. The MAX6650 is designed to control a single fan. The MAX6651 has more features, it can controls a single fan and can monitor and watchdog three additional fan tachometer outputs. We can synchronize multiple MAX6651s to control multiple fans. The IC […]
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