12
votes
Accepted
Using ON-ON switch instead of ON-OFF switch?
An ordinary ON-OFF switch (known as a single-pole single-throw, or SPST) has two terminals. Call them A and B. In one position A is connected to B; in the other position there's no connection between ...
- 1,535
4
votes
Accepted
What is the purpose of R1, D1 in this gate driver? How they can control the turn on/off time?
R1 is there to control the turn ON time of the FET. This could be because of EMC issues if you have too abrupt current spikes or simply to limit the inrush peak current.
The diode is there to ...
- 424
3
votes
Accepted
Can I wire the PnP wire to ground?
No, you can't ground the black wire, it will damage the output.
If you don't need the black wire, leave it unconnected.
- 165k
2
votes
Electronic bilge pump switch
I wouldn't do it with transistors. A relay will do this job rather nicely:
simulate this circuit – Schematic created using CircuitLab
With bilge empty, LOW and HIGH are open, A is at off (0V), ...
2
votes
Help identifying 10-pin SMD IC in TP-Link TL-SG2008P switch
It's a SCT SCT2620 step-down converter.
(Source: lcsc.com)
- 6,811
1
vote
Accepted
Switching off when a percentage of the peak value has been reached in LTspice
The goal isn't clearly stated, but I'll take a guess:
The output is the middle graph.
More needs to be added to ensure the proper startup condition for an actual circuit as you could end up with an ...
- 10.6k
1
vote
Using one momentary switch for multiple IC's at different pull-up voltage levels
I strongly suggest that you consider adding full isolation circuitry in the form of A / B selection analogue mux switches so that the particular switches that you want to assign dual mode ...
- 57.6k
1
vote
Cycle off a voltage at a specific amplitude height [revised]
You could detect a change in direction of the input sinusoid, using a differentiator. The derivative of \$sin(x)\$ is zero when it changes direction, at its peak and valley points, and it becomes ...
- 42.4k
1
vote
Accepted
Add Raspberry Pi GPIO to existing 12V application
There are several ways to approach this. The most straightforward is to find some DC supply that is always present when your "device" is powered. Then connect your R1 to that rather than the ...
1
vote
DY-SV5W Voice Playback Module
Pulling down two lines with one button will require some diodes.
simulate this circuit – Schematic created using CircuitLab
When drawn as a square matrix like this, you can see that you can ...
- 177k
1
vote
DY-SV5W Voice Playback Module
You don't appear to have any pull-up resistors on the chip inputs that connect to the control switches. It's quite likely that they will be needed. There may be other problems but, you haven't posted ...
- 467k
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