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Microprocessor boards like Arduino, Raspberry Pi, Beaglebone can do a lot of nifty things with electronic signals. It is sometimes necessary to move some of those tasks outside of the processor itself. Enter the world of custom circuits. There are a lot of components out there that have specialized functions, there are even more that can be used a variety of ways.

In this video, I will show you a few of my most used helpful circuits. They involve using the 555 timer and the Operational Amplifier.

See the full seriesĀ here.

Ryan Slaugh

Ryan Slaugh is a hardware and software engineer with over 15 years of experience designing and building different systems. While he has a few college degrees, his best training came from growing up on a farm and working with his father who was also an electrician. Ryan works regularly with woodworking, metal work, electronics, and software. Ryan also has a love of tools and collects as many as he can.


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Comments

  1. Drew says:

    I enjoyed the video and learned a few things. I don’t have any experience designing custom circuits and am not interested in learning to become an electrical engineer, however, I’d love to know if you have any recommendations for learning simple circuits, like the ones that you demonstrated, that can be used in a building block like fashion to design more advanced circuits? Additionally, what is the purpose of R3 in the Op Amp comparitor circuit?

    1. leopoldo says:

      The resistor R3 is used to limit the current going through the transistor that otherwise would be enough to fry the transistor

  2. Ryan Slaugh says:

    For Op Amps I would go to the book “Op Amps for Everybody”. Its a nice start. For the 555 there are a lot of online sources. For simple circuits in general I would start with the Forest M Mims library available online or at Radio Shack.

    Both pots in the circuit change voltage levels on the pins they connect to on the Op Amp. One is a reference voltage, the other is a measured voltage. If measured goes above reference the LED turns on. In a useful circuit environment, you connect one pin to a sensor and look for that level to go above your reference voltage.

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