Archive for December, 2006
Sunday, December 10th, 2006
Resistors 6: Mods
Having talked about pots and variable resistors, let’s put them in parallel and in series with a fixed resistor and see how these can be useful mods. First we’ll look at variable resistors and then at pots. There’s more to say than you might expect. … more …
Sunday, December 10th, 2006
Resistors 5: Pots
Potentiometers, or pots, give control over tone, distortion, volume, and many other stompbox characteristics. Despite the huge variety of effects, pots only directly change resistances in a circuit so we can leverage our previous discussion of resistors into a complete explanation of these important components. … more …
Sunday, December 10th, 2006
Resistors 4: In Series
Resistors can be combined in parallel and in series to create new resistances. Resistors in series are pictured in this LTspice schematic. In combination, these resistors act like a single resistor … more …
Sunday, December 10th, 2006
Resistors 3: In Parallel
Resistors in Parallel
Resistors can be combined in parallel and in series to create new resistances. Two resistors are connected in parallel in this LTspice figure. In this combination these two resistors … more …
Sunday, December 10th, 2006
Resistors 2: Limiting Current
Ohm’s Law
Resistance appears in the simplest form of a fundamental electronic relationship called Ohm’s law:
| V = I ⋅ R |
where V is the potential difference or voltage drop measured in volts, I is the current in amperes (or amps), and R is the resistance in ohms. Ohm’s law says that voltage and current vary proportionally, where the constant of proportionality is the value of a resistor. … more …
Sunday, December 10th, 2006
Resistors 1: Description
Appearance
The fixed resistors commonly used in DIY stompboxes look like small cylinders with leads (or wires) coming out of each end. Such components are called axial leaded. Resistors can be soldered onto a circuit board oriented either way; the leads are interchangeable. The leads are bent so that they can stick into holes on the circuit board. As a result, this type of resistor is also called through-hole. These resistors have a fixed value and … more …