Tagged Questions
3
votes
1answer
86 views
PIC18 with ACT HC49/US XTAL
As part of my current project I need to ensure that my MCU (namely PIC18F4520) runs smoothly, minimizing the possibility of any interruptions. The datasheet ...
1
vote
1answer
223 views
Alternative to optocoupler? Other switching devices?
I have a part that classifies what kind of power I get on ethernet by presenting different loads. For example, the part needs to have a 100 Ohm resistor across two of its pins, and the part will ...
2
votes
4answers
605 views
Pulldown resistor on output pin, how does output still work?
On a part I'm working with, it says that you can configure the part to operate in a particular mode by "strapping" a particular pin to ground. That is, it wants you to use a pulldown resistor to pull ...
3
votes
1answer
352 views
Can I connect ICs directly together
This is probably answered elsewhere but I can't seem to find it.
I have a circuit which uses a Mega8 to drive a couple of ICs as shown in the diagram below.
The ISP connectors in the diagram are:
...
5
votes
2answers
733 views
Transistors: why are resistors needed?
I have a solid state relay which needs at least 3V to activate, and I need to toggle with a 2.3V output from a microcontroller. I've also got a 6V 1A power supply which I can use to power the relay.
...
1
vote
4answers
433 views
Pulldown resistor on MCU output?
I'm using an MCU to drive a set of SSRs, and whenever I reboot the MCU, the outputs that I have attached to the SSRs go high temporarily. I know that a pullup/pulldown resistor can keep a CMOS input ...
2
votes
3answers
1k views
Plans / tutorial for sound effect generator using only analog components?
I've been wanting to make a laser gun sound effect attachment for my son's bike. Currently, I'm using the electronics salvaged from his old laser gun toys. All of them seem to use electronics hidden ...
