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Do a search on EBAY for a cnc breakout board. They have some reasonably priced ones there. It is simply a board which plugs into the parallel port with a cable. The inputs and outputs from the parallel port are then accessible via terminals on the board. The advantage of using this board is...
Thank you all for your replies. The over voltage was on the output of a switching power supply which failed. I have seen and worked with crowbar circuits, but have found them to be very destructive - although they do a good job of protecting the circuit supplied. I have worked with MOVs as well...
Thank you very much for the quick response. So as the circuit stands, using the formula and the given values for R3 & R4, the trigger value is 5v right? Next question, what is the safe/max voltage for 5v digital/microcontroller circuits without causing damage?
What is the best way to protect circuits from overvoltage. I recently had a case where a 5vdc switching power supply failed and went up to 9vdc. This fried the circuit boards that it supplied. MOVs might be a bit slow ,I think. Any ideas, circuits etc will be appreciated. The circuits boards are...
To drive your stepper motors for a CNC machine, the simplest way is to use a PC running EMC2 software with a parallel port. EMC2 is Ubuntu Linux based and is free. You will then need to have a breakout board to interface the parallel port to your stepper motor drivers. There is plenty of...
Does anyone have a circuit for a low cost 1 minute precision timer circuit? I have built a timer with a 555 ic. It is ok but the accuracy varies with time.
voltcraft
I have a 10MHZ Voltcraft single channel oscilloscope which is not working. Does anyone have a schematic for this? It is a Model 610-2. I have opened upthe oscilloscope and done some preliminary checks. Everything looks fine. The tube "heater" is functioning, but there is no trace...
PIC Input protection
What is the best way to protect the input of a PIC microcontroller, for eg if an external micro switch is connected to an input pin? What is common practice and offers good protection.
pic12f675 calibration
The oscillator calibration value for the PIC12F675 and 629 is placed in program memory. Does this mean that when the chip is erased the cal value is lost? If so does the cal value have to be written and saved each time. If so where in the assembler program code does this...
Sound on SD card
Recently I was looking for a chip to record sound. I came across a chip ISD1700. This chip can store 60sec of sound at a sampling rate of 8khz. This then got me thinking. Is there any way of recording sound on an SD card and then playing it back through an amplifier (like an...
kicad disadvantages
Try Kicad
Very good schematic and PCB software.
**broken link removed**
Then click on KiCad-2008-08-25c-final-WinXP_autoinstall.zip for a windows install file. Hope this helps!
kicad schematic
I use Kicad. It seems very good - schematics and manual routing. I tried the autorouter recently on a PCB with about 10 ICs. It made a mess of the board! Just as well I checked! Many tracks were routed incorrectly although the schematic is 100% ok. Totally unrelated tracks were...
frequency generating using 8051
I have played around with the PIC16F628A, however I have never used the Timer Capture/compare module for anything. How do you go about doing this? I just need some pointers. Also how would the pulse be turned on and off in software? I do not have any specific...
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