2answers

[Others] When using an NPN transistor for switching does the emitter have to be grounded?

I am trying to control a remote via the gpio pins on a raspberry pi. I don't want to have to use relays because of the space they take up and the mechanical noise. The problem is the pads of the r...
  • answered Aug 11,2020
    by Gorge
2answers

[Others] Is it ok to switch a high frequency signal with a low frequency transistor?

If you have a high frequency signal, going through the collector - emitter of a general purpose transistor, can you just turn it on/of with a low frequency signal at the base?If you leave the transist...
  • answered Aug 11,2020
    by Gorge
2answers

[Others] Will the led driver burn these two led strips If I connect 2 of these led strips to the Led driver(output: 12v 30A)?

The Led driver (output: 12v 30A) and two led strips of 5m each (Input Voltage: 12V DC, Power: 2A 24W).
  • answered Aug 10,2020
    by Gorge
1answers

[PCB Prototype] i want to make a pcb for a macro keyboard but can't design it

can somebody advise (or if you are so very much kind provide) a pcb with the functions of a 8 by 8 macro keypad and 2 rotary encoders support and using the pro micro to be the brains of the macro keyp...
  • answered Aug 10,2020
    by Remy
5answers

[Others] Can I use magnet wire to light an LED with an Arduino?

I need to control a really small LED and use the thinnest wire possible so it looks hidden. Magnet wire is very thin and might work but I want to know if I can control an LED with it?
4answers

[Others] Rotary encoder keyboard for Hantek PC Scope

Can you please advise on schematic available for a keyboard contaning rotary encoders. This project is for a Hantek 6254 USB PC based Scope.
  • answered Aug 07,2020
    by Jason
4answers

[PCB Prototype] Confusion about GND and no net zones.

Hi, I've been designing a keyboard pcb, and I'm a bit confused about GND and no net zones, as in when I should use them( both layers, or just one? Also, should I have isolated copper fills at ...
  • answered Aug 07,2020
    by Kemio
4answers

[Others] How do I trigger a TIP32C PNP transistor with a 5V output signal from an NE555 IC?

I would like to know how. What voltage does the TIP32C need to make it as a solid state relay. Thanks for any help.
  • answered Aug 06,2020
    by Gorge
2answers

[Others] Symbol fields are not in the correct place in schematic

Hi all,When I place passive symbols in a schematic the fields, they don't seem to stay where I placed them in the symbol editor and I can't seem to figure out what I'm doing wrong. Has any...
  • answered Aug 06,2020
    by Kemio