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Here is a most basic example of how that can be useful. When the output transistor is enabled, the output is effectively connected to ground, and Table Hardware Openwrt the output goes close to 0 V. This, therefore, is a neat way to build a logic-level shifter. Note that the output does not have to be pulled up that far. If the pull-up were connected to 3V, the output range would be V, and you could use that as an input to digital electronics that do not tolerate a full 5 V on their inputs.
For the SNN, the output can go as high as 30 V, so you can also use it to shift higher as well. Another way that you can use open collector outputs is as a compact substitute for a set of external, discrete transistors.
Suppose that you wanted to drive six sets of three white LEDs each, controlled by six outputs from your microcontroller. To do this, you might hook up each output, through a resistor, to the base of a transistor, and use that transistor to switch the current to the LEDs.
The SNN could be used the same way— allowing you to substituting one chip for six resistors plus six transistors. The blinking TTL input comes from the microcontroller, into the SN, and the external clip leads bring the 12 V on board.
The issue is that the open-collector output does not source current at all; it only can sink current. So, if any current were to flow through the LEDs, it would not come from the SN output, but from the 12 V rail, through the 10k resistor.
High-side drivers switch LEDs or other electronics on and off, using a switch connected to the side at higher voltage. For example, in a multiplexed LED matrix, each row is switched on one at a time, using a high-side driver connected to each row.
Then, low-side drivers connected to each column dictate which LEDs in that row are on and off at a given time. So how might we go about building a high-side driver that works?
And so… we end up with another bad circuit. And as far as bad circuits go, this is one of the most common. The SN output is pulled up to 12 V, through a 10 k?
It is also connected, through 1 k? When the SN input is high, the outputs is effectively disconnected, and the base of the transistor is pulled up to 12 V, turning off the Open Hardware Tablet Generator transistor, and ensuring that no current flows through the LEDs.
When the SN input is low, the base of the transistor is connected to ground through the 1 k? Above is a simple example. Two SN channels, from inputs X and Y have their outputs connected together and to a pull-up resistor. Then if both X and Y are high, the combined output will also be high.
But, if either X or Y is low, the output will be low. This constitutes a logical AND gate, because the output is high if and only if both X and Y are high. Other types of wired logic gates can be built this way as well. But they are still, on occasion, the right solution to a problem. Booked 11 times today. Booked 10 times Open Hardware Monitor Widget Table today.
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