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eagle cadsoft rj11
Hi,
Is it possible to specify that certain vias are covered with soldermask, and others are not covered before creating Gerbers?
Thanks
My computer cannot control the fan speed at the moment - it is not built into the existing ACPI support on the board. So, I am designing a fan controller to regulate the speed of the CPU fan based on temperature. I am planning on including a number of A/D converters to monitor temperatures as...
I am interested in controlling a FM radio receiver using a microcontroller.
Does anyone know of a design to use as a reference for building a FM radio, which is tuned using digital signals?
Re: Isolating grounds
Thanks for the replies
I have already thought of using optocoupling. My problem is that I dont know of an easy way of sending back an analog signal through optocouplers. Also, it is expensive since I have 24 digital signals from the microcontroller to motor drivers and...
Hi
I a designing a circuit with a microcontroller, and a series of high current motors. I need to isolate the grounds from each other so that the noise from the motors doesnt cause the microcontroller to shut down.
Do I just keep two grounds and separate and join them at the supply with an...
I need to design a Mosfet based H-bridge driver for a dc motor. It needs to be capable of delivering 10A current to a 24V motor. Does anybody have any good links?
phone line interface
Hi
I need to interface a microcontroller to my phone line via a DTMF(touch tones) decoder. Does anybody have a schematic for this interface? and does anybody know of a suitable IC to decode DTMF tones?
Thanks
Nick
There is an art to putting the board into caustic soda - long enough so that all the purple etch resist that you dont need is gone but not so long that your tracks start to dissolve :) . It just takes a lot of experimentation to find the right concentration and time for developing.
If you're...
parallel port dc motor diode
Scrap my previous post - Batdin's schematic is a more elegant solution than I presented :) .
Im one of those crazy people who goes for a complicated solution when something like the previous schematic is all that is needed.
parallel port opto isolation schematic
To use the parallel port is is essential to use some type of buffer(eg optoisolator, 74XX240, etc) to prevent damage to the port from drawing excess current. From this you need some method of converting the digital signal to a signal which will regulate...
This is probably a bit pointless, but you should check to see what type of solder you're using as well. Even if you do adhere to all of the above guidelines but you use acid cored solder, you will end up with a ton of corrosion on your tip. Always use resin cored solder.
If you want to be...
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