Electronics Forum (Circuits, Projects and Microcontrollers)

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am looking at having 25 boards made with assembly2 days

BUT JLPCB does not have the pic so looking elsewhere.
hand soldering the 44 pins (18f43k22) would take lots of time.
Probably end up assembling all 25 boards by hand
Saw an ad for NEXTPCB and just the boards are a little cheaper
any suggestions?

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phase velocity and velocity factor effect on pulse input2 days

Hello, I have simulated a basic microstip line as shown below and got s-parameters.few questions
1. what is the link between phase velocity and velocity factor?
2.Is there a way to look at S-parameters and calculate by how much pulse input(10ps rise time) will be time delayed at the output?
Zipped S2P file is attached.
Thanks.

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Seven Segment Display Ghosting on Multiplexed Design3 days

Hi,
I’m driving a four-digit seven segment display from a microcontroller using transistor multiplexing. Digits are readable, but faint ghost segments appear during fast updates.

Refresh is handled in a timer interrupt.

Questions:

Should I add dead time between digit switching and segment updates? Could transistor storage time be causing overlap ...

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