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Category: Inside Circuits Views: 1367 Rank: 3 When the lines SDA (Serial DAta) and SDA 'are logical '1', the circuit is at rest with the result that optocouplers IC 1 and IC2 can not convey absolutely no information. But once the SDA line become the 'O', then the LED the IC 1 becomes conductive through the resistor R2. At that time the line SDA 'and it becomes reasonable' O 'because of conductivity of the transistor of IC 1 and D2. This logic state remains on the right side of the channel. After the LED of IC2 can not properly polarized, and therefore unable to transfer back to the left. In this way, ensure that the circuit will never be 'stuck' to logical 'O'. As you noticed, the circuit is symmetrical.  Thus, if the line SDA 'lead to logical' O ', then the SDA line will also acquire. The lower part of the circuit works like the above, except that here the signal moving is the SCL (Serial CLock). The R 1, A4, A5 and A8 are the usual restraint Elements 3.3 KO which should always be placed on the lines of bus 12C. If the resistors are already co-dedemenes elsewhere in the channel, they can be received by this circuit. The current absorbed by the Bus lines are a little higher than expected due to the presence of LED diodes that optocouplers are parallel with the resistance straps. Nevertheless, the value is still consistent with standard specifications 12C.
Related circuits The LM3909 is configured so that the frequency of oscillation is dependent on a single RC timing circuit, which consists of These two comparators are over- and under-voltage comparators. In Fig. 104-5(a), if Vm exceeds the reference voltage, t Wide bandwidth low noise amplifier ParMitic input capacitance ICi I 3pF tor LM5S, LF 156, and LF157 plut any additional layout capacitance) interact If the tube is level with respect to gravity, the bubble resides in the tube"s center and the electrode resistances to common are identical. As the tube shifts away from level, the resistances increase and decrease proportionally. Transducers of this type must be excited with an ac waveform to... 400-Volt 60-watt push-pull power supply The design delivers a regulated 400-V, 60-W output. The TL494 switching regulator governs the operating frequency and regulates output voltage. Rl and Cl determine switching frequency, which is approximately 0.SRC—100 kHz for the values shown. The TL494 directly drives the FET's gates with a... This circuit is for the purpose of monitoring automotive lighting. Two special ICs are available from Telefunken that ar Pushbutton-Controlled Power Switch In both circuits, the SCR (and thereby the lamp) can be latched on by momentarily closing SI, thereby fe Polarity Gain Adjustment Circuit By adjusting one potentiometer, this circuit`s output can be varied from a positive-going version of the input signal, smoothly through zero output, then to a negative-going version of the input (see the figure). If the input signal is a positive pulse of, for example, +2-V peak/the output pulse... How I2C Isolators Work
EEVblog #268 - Xantrex 300V 4A Power Supply Teardown
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