8

Fun fact: MOSFETs (JFETs too!) will conduct in either direction when Vgs is above threshold. The issue with MOSFETs (3-terminal ones, with the body tied to source) is that the parasitic body diode that's formed by the FET structure and body-source tie also conducts when the drain-source voltage is in the reverse direction even if the FET is off. More about ...


7

but would it be ok to do in a mixed voltage circuit, CMOS components and dc motor driver circuit? Simply, yes. But I would use a high-side switch instead, to keep the circuit grounded when it's off. simulate this circuit – Schematic created using CircuitLab The configuration above allows you to switch the circuit on and off with a logic-hi signal. ...


4

A few traps: inductive loads can burn your mosfet if you turn it off fast enough and there's no kickback suppression diode capacitive load can take a current surge when starting and melt the mosfet 1MOhm and long wires catch noises and may turn the system ON unwantedly 12V Vgs may be too much to the mosfet and it gets easily worse if there's ...


3

Transistors are good for switching high currents and are used in many high current switching applications. Mosfets in particular have very low resistance when switched on and can get into the milliohm range which make them suitable for high current. A n channel mosfet in a "low side configuration" could switch the currents and voltages you want. ...


3

If your main interest is the capacitance: you need only one 46 pF caps for the on channel. the capacitance is not to ground but in part to v+,in part to V- and in part in parallel with the channel resistance. This goes for every capacitance value in the datasheet. Each analog pin of the device faces both an NMOS and PMOS transistor. The body of NMOS is ...


3

You're right, this specific substitution only works if the initial voltage of the capacitor is 0V. You could of course replace the voltage source with "Vs u(t) + Vo", then it'd also work if there was an initial voltage Vo.


3

Yes, there is a standard way to mount rocker and toggle switches. Unfortunately, that standard is different between the USA and the UK. USA is on up, UK is on down. I don't know about the rest of the world, it would interesting if locals of other countries/continents would add in comments what their local standard is.


2

That is a slide switch, rather than a toggle switch. It may be possible to design something to operate that switch from outside the case, but I would probably remove that switch, and run wires from the pads it is soldered to out to a panel-mounted toggle switch.


2

But what exactly happens as operationB is done? When you perform operation B you are eliminating the charge on C2. The electrons on one side of the capacitor flow to the other side and combine with the positive charges there. The total net charge on cap is reduced to 0. Assume C1 and C2 have the same capacitance and the system starts with Q charge on C1 and ...


2

The above model is a good simplified model and will work for a 'worst case' resistance model in some cases. If you need a more detailed model consider using the full spice model (parts->switches->ADG436) Also make sure that you are using the right resistance, as the resistance changes on temperature (and drain/source voltage). If the signal on the ...


2

2.4 GHz is a fairly low frequency when it comes to trying to make useful L or C-equivalents with microstrip structures. But instead of trying to make direct equivalents, you could consider some other options that will achieve the required functionality. Instead of capacitors C19 and C20, you could make a directional coupler structure that blocks DC while ...


2

The ratings you see are a combination of voltage and current. They originate as well from a combination of phenomena: voltage withstanding capability that is the ability to keep isolated two terminals across the gap of the open contact; of course there re margins dictated by standards, so that some overvoltage level and some impulsive overvoltage level are ...


2

You have not specified the current range, voltage, and switching times. For fast switching with large V & I you can even use thyristors, although they cannot be turned off at will: in case of an AC waveform they will switch off at the first zero crossing. Thyristors are good to e.g. discharge pulse forming networks and capacitor banks to create large ...


2

If you are looking for making an interrupt on each input change and then search for the changed input, I usually use 'XOR' gates (or equivalent depending on rising/falling edge) for finding any change on inputs. You need to create 8 input 'XOR' gates (using multiple 2 or 4 input gates) and connect the output to the interrupt pin. If any pin change happens, ...


1

It looks to be something like this: C&K Switch/Digikey


1

Unfortunately this site is set up for answer very specific, targeted questions. It is not set up to deliver a course in electronics. It is likely you can build your project by assembling various pre-made components, but to understand how to connect the components together you will still need a basic understanding of electronics theory. For learning ...


1

Instead of using a solid-state relay I would go for a mechanical relay. Two reasons: They withstand well overvoltages between open contacts and towards the coil; values such as 1000 Vrms for 1 minute are commonplace. They do not introduce capacitance, as the soild-state one would do, so you do not risk to compromise circuit operation (maybe resonance with ...


1

You can't exceed the datasheet ratings. If there is no other mention, then those are the limits you are given, and you can't switch more than 6A at 125VAC or 3A at 250VAC. The datasheet does not rate usage over 250VAC or any DC ratings, so they are unknown. Usually for a given switch, the DC voltage ratings are lower than AC voltage ratings.


1

You could have the pedal activate a relay... simulate this circuit – Schematic created using CircuitLab The relay should be a 12 volt relay. For the diode a 1N4007 would do the job. You can read more about selecting flyback diodes in this question: How to choose a flyback diode for a relay? One drawback is that the 6-volt buck regulator is running all ...


1

The datasheet shows that the 1937650-9 is a 24 V, bistable 2-coil relay. Table 1. The datasheet shows that the 2-coil relay has a common + terminal (A3) and that to operate the relay you connect A2 to '-' and to reset it you connect A1 to '-'. simulate this circuit – Schematic created using CircuitLab Figure 1. How the bistable 2-coil relay is ...


1

From a safety perspective, should the device normally be off or on? Because it seems like with on up, the user has to intentionally turn the device on, and accidentally turning it on would be unlikely. While anything brushing against the switch or falling on it would tend to turn it off.


1

simulate this circuit – Schematic created using CircuitLab Figure 1. A simple example circuit. It's a common feature on microcontrollers and other devices that there is a low powered sleep mode. Notice in Figure 1 that the battery is permanently connected to V+ but the on-off switch only signals to the device whether to be on or off. Switching off will ...


1

simulate this circuit – Schematic created using CircuitLab simulate this circuit This is what I could understand from the essay. 1st diagram: Two float switches NO contact - if the water is present then the contact is made. First the LO Lev is on, then after accumulating water even the HI Lev turns on. At that time RLY1 is engaged which turns on the ...


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