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I recently took apart a HDD and found this board-to-board connector that's used to attach the controller PCB to the stepper motor PCB underneath simply through "spring" contacts.
I'm trying to figure what this connector type is called so that I can buy it on Mouser or Digikey. The pitch of...
I am trying to create a circuit that allows me to digitally adjust the output voltage of a regulator using SPI.
My current approach is to use an MCP1727 adjustable voltage regulator attached to a MCP4151 10kΩ digital potentiometer. Both the MCP1727 and MCP4151 are powered off of the 5V rail...
Is there a way to create a custom device that contains a symbol, but no package?
I'm trying to do this intentionally so I can I have a circuit that is shown on the schematic as a reference but will not be converted into a board layout when it comes to PCB layouting.
If that isn't possible, a...
boost converter 200 vdc output
Thank you all for your responses so far.
As it turns out, the 100ms of undefined PWM output was killing the boost converter. I replaced the IGBTs with MOSFETS (IRFP450B) and placed 4.7kΩ resistors pulling the gate down to ground. (Thanks Tahmid)
However, I've...
driver circuit of mosfet using boost converter
I was looking at my post and noticed that I put a power-up delay of 100ms before I even define the outputs. According to the PIC18F2525 datasheet, the output of the ports are undefined upon start up. Is it possible that because the gate of the IGBT...
200v boost converter
When I ran it the second time (with the fresh new IGBT), the frequency and duty cycle were 10kHz at 70% duty. If my calculations are right, the peak current should be 8.40A which is below the specified collector current for the IGBT (with a heatsink).
I re-checked the...
problems boost converter
Interestingly the waveform at the gate of the IGBT looks almost exactly like that of Node A in the schematic.
I desoldered my old IGBT and I soldered in a new one. I tested the IGBT that I desoldered and it no longer works. The new one I soldered in now no longer...
For one, you should use HS instead XT as the oscillator crystal settings since you are using a 20MHz clock according to your code.
Second, a 10us delay is ridiculously short, meaning each LED barely gets enough time to activate before being turned off again. Set the delay to at least above...
measure pulse width
I agree with microcon, measuring the time between between pulses and calculating the RPM is definitely the easiest. However, depending on your applications and the strength of your microcontroller, evaluating RPM = 1/time may not be needed/efficient.
In a past project, in...
boost converter circuit
Objective: To build a boost converter that can convert 12VDC to 200VDC.
Problem: The output voltage trails off around 16-20VDC depending on the frequency I use.
Details: First off, I'm using the technical notes mentioned here in order to build this.
I'm using a modded...
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