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Saved by uncleflo on June 23rd, 2019.
With microcontrollers and other Integrated Circuit (IC)’s getting smaller and smaller Printed Circuit Board (PCB) design gets more and more difficult. 2 layer PCB design is getting common for small companies and hobbyists but 4 layer or more is a bit daring for those used to 2 layers. When designing a circuit with a Ball Grid Array (BGA) that has 100 or more pins a 4 layer circuit board is necessary, but more layers can make designing easier. With prices of 4 layer boards getting lower it can be a better idea to route a board thats hard to do in 2 layers in 4 layers as it can save a lot of time. This document will explain the basics of routing PCBs with 4 or more layers with Cadsoft Eagle.
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Saved by uncleflo on December 20th, 2018.
The L298 is an integrated monolithic circuit in a 15-lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Two enable inputs are provided to enable or disable the device independently of the input signals. The emitters of the lower transistors of each bridge are connected together and the corresponding external terminal can be used for the connection of an external sensing resistor. An additional supply input is provided so that the logic works at a lower voltage.
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Saved by uncleflo on December 20th, 2018.
Dedicated integrated circuits have dramatically simplified stepper motor driving. To apply these ICs, designers need little specific knowledge of motor driving techniques, but an understanding of the basics helps in finding the best solution. This note explains the basics of stepper motor driving and describes the drive techniques used today.
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Saved by uncleflo on December 20th, 2018.
The L298 is an integrated monolithic circuit in a 15-lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Two enable inputs are provided to enable or disable the device independently of the input signals. The emitters of the lower transistors of each bridge are connected together and the corresponding external terminal can be used for the connection of an external sensing resistor. An additional supply input is provided so that the logic works at a lower voltage.
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Saved by uncleflo on July 15th, 2014.
In this post I will describe the hardware and the software part of a project involving the use of BLDC (Brushless DC) motor salvaged from a broken XBox 360. This is a second installment in the series of posts related to Arduino and brushless DC motors. Please see the first part for a bit of info on the theory behind the commutation sequence. Once you understand the commutation sequence for the particular design of the BLDC motor, the circuit design for the BLDC driver becomes pretty clear. It is not much different from a bipolar stepper driver in that we need the be able to both source and sink current at all ends of the windings, except of course in this case there are only three ends whereas the bipolar stepper has four.
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