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This is a is a precision closed-loop LED driver that provides very accurate constant light and can be used for photography, scientific research, and other applications that require an accurate light source. The project consists of light sensor OPT101 and OPA569 power OPAMP. OPT101 converts light into voltage, and OPA569 is used as an adjustable linear current source that controls the flow of current through the power LED. Installation of the Power LED and OPT101 Sensor is shown in the figure below. The overcurrent limit of LED is set to 1A using resistor R4. LM336 provides an accurate voltage reference to OPAMP which is 0.5V. The circuit works in a closed loop. At power ON, the LED light reflects to the sensor, and OPT101 provides the voltage output as the light level falls on the sensor, this voltage is fed to power op-amp, and op-amp compares the input voltage from OPT101 and reference voltage 0.5V. If there is an error, the op-amp controls the current of the LED to match the disparity between the output and input. This way light level is maintained and this is constant. It is important to have proper housing for the sensor so external/ambient light should not fall on the sensor, otherwise constant light will not be maintained.
This is a is a precision closed-loop LED driver that provides very accurate constant light and can be used for photography, scientific research, and other applications that require an accurate light source. The project consists of light sensor OPT101 and OPA569 power OPAMP. OPT101 converts light into voltage, and OPA569 is used as an adjustable linear current source that controls the flow of current through the power LED. Installation of the Power LED and OPT101 Sensor is shown in the figure below. The overcurrent limit of LED is set to 1A using resistor R4. LM336 provides an accurate voltage reference to OPAMP which is 0.5V. The circuit works in a closed loop. At power ON, the LED light reflects to the sensor, and OPT101 provides the voltage output as the light level falls on the sensor, this voltage is fed to power op-amp, and op-amp compares the input voltage from OPT101 and reference voltage 0.5V. If there is an error, the op-amp controls the current of the LED to match the disparity between the output and input. This way light level is maintained and this is constant. It is important to have proper housing for the sensor so external/ambient light should not fall on the sensor, otherwise constant light will not be maintained.
Video
https://www.youtube.com/watch?v=gTsxiuxRePQ
Module is a dual 12-bit PWM-to-voltage output DAC with high accuracy. The board is based on the LTC2644 chip. The LTC2644 measures the period and pulse width of the PWM input signals and updates the voltage output DACs after each corresponding PWM input rising edge. The DAC outputs update and settle to 12-bit accuracy within 8μs typically and are capable of sourcing and sinking up to 5mA (3V) or 10mA (5V), eliminating voltage ripple and replacing slow analog filters and buffer amplifiers. The circuit has a full-scale output of 2.5V using the 10ppm/°C internal reference. It can operate with an external reference, which sets the full-scale output equal to the external reference voltage. Each DAC enters a pin-selectable idle state when the PWM input is held unchanged for more than 60ms. The project operates from a single 2.7V to 5.5V supply and supports PWM input voltages from 1.71V to 5.5V. The PWM frequency can be any frequency between 30Hz and 6. 25kHz. The input level can be between 1.71V and 5.5V, set by a separate IOVCC pin. This project solves many problems associated with filtering a PWM signal to produce an analog voltage, producing a fast-settling, accurate analog voltage in response to a digital PWM input.
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This is a low-cost video distribution amplifier capable of driving up to four video lines. The amplifier is configured with a non-inverting gain of 2. The input video source is terminated in 75 Ohms and is applied to the high impedance non-inverting input. Each output line is connected to the op-amp’s output via 75 Ohms series back termination resistor for proper cable termination. The termination resistor at the other end of the lines divides the output signal by 2, which is compensated by the gain of 2 of the op-amp. The project is built using AD8010 op-amp which is optimized for this specific function of providing excellent video performance in driving multiple video loads in parallel. Significant power is saved and heat sinking is greatly simplified because of the ability of the AD8010 to obtain this performance when running on ±5 V supply. Circuit provides 46dB of output-to-output isolation at 5Mhz driving back terminated 75 Ohms cable. Ferrite beads and high-value ceramic capacitors are used on the power supply input to reduce the noise.
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