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Comment Please fill in the content! DHL www. UPS www. FedEx www. Registered Mail www. Step1 Product. Also, when connecting the described circuit to the power supply, low impedance wiring should be used. NC 16 Figure 4. Ie vs. R1 GND 80 40 0 SC Note: Outlined components are optional depending on the quality of the power supply.
For increasing the output power of the IRED, the value of the resistor should be reduced. Similarly, to reduce the output power of the IRED, the value of the resistor should be increased. For typical values of R1 see figures 4 and 5 , e. The upper drive current limitation is dependent on the duty cycle and is given by the absolute maximum ratings on the data sheet and the eye safety limitations given by IEC R2, C1 and C2 are optional and dependent on the quality of the supply voltage VCC1 and injected noise.
An unstable power supply with dropping voltage during transmission may reduce sensitivity and transmission range of the transceiver. R1 Table 1. Lowering the irradiance threshold increases the sensitivity to infrared signals and increases transmission range up to 3 meters.
However, setting the Pin SC to logic HIGH also makes the transceiver more susceptable to transmission errors due to an increased sensitivity to fluorescent light disturbances. It is recommended to set the Pin SC to logic LOW or left open if the increased range is not required or if the system will be operating in bright ambient light. The guide pins on the side-view and top-view packages are internally connected to ground but should not be connected to the system ground to avoid ground loops.
They should be used for mechanical purposes only and should be left floating. Telefunken's TOIM interface circuit is designed for this shutdown feature. If the microcontroller or the microprocessor is unable to drive the supply current required by the transceiver, a low-cost SOT23 pnp transistor can be used to switch voltage on and off from the regulated power supply see figure 7.
Or maybe you'll just like to discuss something This could be over now! It can be built so small that it's possible to easily install it in the casing of your old rear light. The circuit exploits the very high capacity 1F of a Golcap capacitor to supply a current source consisting of the two pnp-transistors with considerable amount of current about 10mA for a certain time before the intensity fades away. The Goldcap is reloaded by the generator of your bike during normal ride.
The connecting polarity is not important as the bike's generator produces an AC voltage and the Zener diode protects the rest of the circuit when needed. The circuit has been in service for quite a while on my bike and I'm very happy with it.
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