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[Others] How to create a symmetric voltage supply for an op amp after a DC/DC conversion?

I have a power supply that provides +36V DC and -36V DC to power the amplifier, but I also need to supply positive and negative voltage to op amps (in an active crossover before the amplifier). Should...
2answers

[PCB Assembly] Thermal pads on CREE LED's and aluminium boards

Hello,How should I connect the thermal relieve pad on a CREE led (XPGDPR-L1-0000-00F01) to the center footprint of the aluminium board?How should I make this connection, so that the pad is soldered co...
4answers

[Others] How to distinguish these buzzers?

I got that there are active and passive buzzers. But they look same. How to distinguish these guys?
5answers

[PCB Prototype] What are these 4 dots in the board? I'm quite curious.

What's the function of those dots? Anyone have seen this before?
4answers

[Others] What need to be checked before upload?

Before upload the pcb design, what do I need to check? Any experiece and suggestions are welcomed!
3answers

[Others] Will the bottom resistor work as a replacement for the top one?

Can anyone explain the difference between these two resistors? And what's the difference between J and F?
1answers

[Others] How will you find the resonant frequency of an arbitrary combination of R, L, and Cs?

How will you find the resonant frequencies if given a circuit with any combination of Rs, Ls, and Cs?
1answers

[Others] Can I use inductors for SMD as electromagnets?

I'm not seeing many surface-mount electromagnets out there. There are definitely a lot of SMD inductors available, and I hope they're cheap. How can I calculate the magnetic force they will ex...
3answers

[Others] Do you know a easyway to connect two arduinos?

For my project, I plan to connect one arduino to a motion sensor to send information to another arduino that will turn on a light when motion is detected. Do you guys have some ideas?
1answers

[PCB Prototype] The slot is locked and cannot be exported to production

The slot is locked and cannot be exported to production
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