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1

Kicad global connector is valid for whole schema project (all sheets), hierarchical port provides connector on hierarchical sheet. It makes significant difference if your hierarchical sheet is reused more times or you have own library of sheets. In this case you can connect hierarchical connector on project sheet where hierarchical sheet(s) is/are placed. ...


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Those look like they were actually drawn with either a schematic stencil or very carefully by hand. "By hand" is something people used to do before software. With practice, the art can be learned, but that's time consuming and lame. Just make a schematic in Visio and then apply a sketch filter with Photoshop.


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If you want to evaluate the IC I would start by ordering their eval board first. This will save you the trouble of designing your own board to work with that particular IC. You can then tweak it to get the performance you are after. In the user guide it shows this circuit. Pg 36 here. Here you can see they used 100Ω and 1u for Rc and Cc respectively. You ...


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Likely an error The overall quality of Arduino connected hardware designs varies widely as the community consists of a comparatively large number of hobbyists and students. The 0.1uF cap was most likely intended to decouple the adjacent +5V power supply line. Attaching it to the latch signal line serves no unique beneficial purpose and can cause problems ...


4

I don't understand what is happening on this diagram. Referring to the diagram in OP. This MOSFET-TRANSISTOR duo is used to enable and disable the power supply of the module, when MCU_CTRL is high Q101 is enable, which in turn enables the Q102 by pulling the GATE of the PMOS Q102 to GND, and enable the power for module on VBAT pin. When MCU_CTRL is ...


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Most modems need up to 2A peak current. I have not checked your specific one but most LDOs will struggle to supply 2A bursts. That's why most designs use DC-DC supplies.


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The real world application varies upon the application and the type of the signal. If linearity is not a concern, then the above circuit diagram can be improved to remove the 47(ohm) resistor and the circuit will act as a digital circuit, with almost no sound when there is no light. On the other hand if linearity is a concern for analog applications, then ...


2

That is a really crappy circuit since it depends on the gain of the transistor being just right. Real transistor gains vary widely, even within the same production lot. Competently designed circuits work from the minimum guaranteed gain of the transistor to at least 10 time that, preferably to infinite gain. I would start with the transistor stage setting ...


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This is known as an emitter follower. There is no voltage gain in the circuit, this acts as a impedance buffer i.e. it can drive heavier loads that the CDS cell could on it's own. Light on the CDS cell generates current which goes into the base of the transistor, this current is multiplied by the transistor (this gain is known as Hfe). This current when ...


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It is a simple non-inverting transistor amplifier. The resistor to ground is what allows it to be non-inverting. When the transistor is off (the CDS cell not conducting), the Headphone output at the emitter of the Transistor is pulled to ground level through the 47Ω resistor. When the transistor is on, the headphone output gets pulled up to 3V, with the ...



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