Search found 4 matches

by jgold
Tue Oct 31, 2017 9:55 am
Forum: General Chit Chat
Topic: Can you use an NPN transistor to control a 3.3v curcuit with a 5V control signal?
Replies: 2
Views: 2876

Can you use an NPN transistor to control a 3.3v curcuit with a 5V control signal?

I have a Sparkfun RGB rotary encoder that I'm hooking up to an Arudino Nano. The blue and green LEDs run at 3.3v. The red led runs at 2. I figured I could run the LEDs directly off of the 3.3v line. Since the LEDs are common anode, I need to switch them on by raising a control pin on the Nano. Basic...
by jgold
Mon Aug 21, 2017 8:47 am
Forum: SparkFun Product Questions
Topic: Where can you get plastic key pins for header connections?
Replies: 4
Views: 828

Re: Where can you get plastic key pins for header connection

Thanks Mike. I found some from a site in Europe but they were selling them individually and they were expensive. Jameco Electronics has some but they're for the Molex type connectors and I don't know if they'll fit the dupont connectors and they don't ship for 75 days. I just realized I have a new 3...
by jgold
Sat Aug 19, 2017 12:33 pm
Forum: SparkFun Product Questions
Topic: Where can you get plastic key pins for header connections?
Replies: 4
Views: 828

Where can you get plastic key pins for header connections?

I don't know if there's a name for these. I've searched extensively but haven't been able to find them anywhere. I see them all the time on computer motherboard connections. For example, the USB port on the mother board has one pin missing. The female connector that plugs into it has a plastic male ...
by jgold
Sun May 28, 2017 11:21 am
Forum: SparkFun Product Questions
Topic: Can a femtobuck drive other things?
Replies: 0
Views: 369

Can a femtobuck drive other things?

I'm trying to figure out how create a variable power solenoid. I want to be able to make it actuate really hard or really soft. I don't really know what I'm doing but I thought that maybe I could vary the current using a femtobuck. It probably won't work though because is seems like it must be figur...