Resistor Technology Comparison
Last Updated on Tuesday, 10 January 2012 03:31 Written by riedon Friday, 13 January 2012 10:50
Make you own Resistor Code Calculator
Last Updated on Friday, 18 March 2011 12:09 Written by Frieda Friday, 4 March 2011 11:00
How fun!
The Resistor Code Calculator is on RobIves.com, where its creator describes it as “Paper engineering meets electronic engineering”!
Rob provides a link to a PDF containing the paper dials for printing, as well as the origami steps to fold it into shape.
Fast Rise Resistors
Last Updated on Monday, 7 February 2011 10:49 Written by Frieda Thursday, 23 December 2010 03:26
In today’s world, pulses are common in electronic circuits. When these pulses encounter a resistor with high reactive components, they are distorted. If the resistor has high inductance, current through it will have a sluggish, slow rise time. The current will overshoot if the resistor has high capacitance. Either condition distorts the pulse’s waveform, potentially disabling the circuit’s function.
A fast rise resistors reduces t
he distortion and Riedon offers resistor with fast rise option.
Wirewound resistor manufactures sometimes refer to Aryton-Perry windings when they talk about fast rise-time or high frequency response resistors. What are Aryton-perry windings? To make an Aryton-Peryy winding, you first wind a wire layer in one direction. After a layer of insulation, you wind the next wire layer in the opposite direction, with the turns crossing every 180 degrees. This reduces the undesirable reactance components of the winding: its inductance and capacitance.
The re
sult? typical reactive values for these special designs are less than 1μh for a 500 ohm resistor, and less than 0.8pf capacitance for a 1 Megohm resistor. This provides a resistor with a fast rise-time of 20 nsec or less, while retaining the desirable tolerance, TCR and stability that are characteristic of wirewound resistors. So call us to get a quote on fast rise resistors.