Frosts Mora Swedish Knives Clipper vs. Craftsman Comparison

April 23rd, 2009 by Tom Scarince

The town of Mora in Sweden is known for its traditional and utilitarian fixed-blade knives.  Many survival and bushcraft experts recommend these simple and very inexpensive knives, especially for beginners.  This article was originally posted by me on the Equipped to Survive Survival Forum.     

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Understanding Mixed Decay and the Allegro A3977 PFD Percent Fast Decay Feature

April 16th, 2009 by Tom Scarince

This article explains why you might want to use mixed decay and how it is implemented in the A3977’s current chopper PWM scheme with the percent fast decay (PFD) pin. 

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Bidirectional PWM Motor Control

April 7th, 2009 by Tom Scarince

Once you understand unidirectional PWM of an inductive motor load, we can expand the concept to a bidirectional h-bridge PWM circuit.  Read the rest of this entry »

Unidirectional PWM Motor Control

April 2nd, 2009 by Tom Scarince

This article covers unidirectional Pulse Width Modulation (PWM) and how it can be used to control the power applied to a DC motor or the current in a stepper motor winding, for instance. While we eventually want to talk about doing bidirectional PWM with an h-bridge, we’ll start with a simple, one-direction control circuit.

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Intro to H-Bridge Motor Control Circuits

March 26th, 2009 by Tom Scarince

Simplified H-Bridge

An h-bridge is a bipolar driver circuit that is often used to control a load such as a brush type DC motor.  This article covers the most basic concepts of a simplified h-bridge circuit. Later articles dig deeper into the details of practical h-bridge operation and design.

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Waste Oil Furnace Secrets

March 20th, 2009 by Tom Scarince

This article explains the important points in converting a standard Beckett AFG oil burner to burn waste motor oil, used ATF, fryer grease or waste vegetable oil in your experimental furnace, heater or boiler.  Read the rest of this entry »

Heating With Biodiesel In A Home Oil Furnace or Boiler

March 20th, 2009 by Tom Scarince

Biodiesel may be reliably burned in a standard home oil burning furnace or boiler with a few minimal modifications accomplished with off the shelf parts. 

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Stepper Motor Wiring Options

March 19th, 2009 by Tom Scarince

Stepper motors may come with four, five, six or eight wires. This article will help you identify the correct way to wire an unknown stepper motor. Read the rest of this entry »

Hello world!

March 19th, 2009 by admin

Welcome to THS Engineering’s new and improved website.  We’re looking forward to posting a steady supply of technical articles, so stay tuned.

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