Richard M. Kurzrok is with RMK Consultants, Queens Village, N.Y. He has been part of the electronics industry since 1953. He received a BEE and an MBA from New York University and an MEE from Polytechnic Institute of Brooklyn (now Polytecnic University). He has written and published over 100 technical articles. Email address: rmkconsulting@aol.com
6 results found for Richard M. Kurzrok, displaying items 1 - 6
March 1, 2007[Ideas For Design] L-C High-Pass Filter Reduces Power Supply's Hum And Ripple
A previous Idea for Design described an R-C twin-tee circuit designed to reduce power-supply hum at 50 to 60 Hz ("R-C Twin-Tee Reduces Power-Supply Hum,"). This Idea for Design presents a new L-C high-pass filter that reduces both power-supply hum at 50 to 60 Hz and ripple at 100 to 120 Hz. The circuit is a relatively simple composite high-pass filter employing the classic design...
May 11, 2006[Ideas For Design] R-C Twin-Tee Circuit Reduces Power-Supply Hum
The R-C twin-tee passive circuit supplies band-reject (notch) filtering to portable applications. It has a circuit Q (loaded) of 0.25. Satisfactory rejection can be achieved when the bridge is balanced (close tolerances of adjustable components) and the capacitor unloaded Qs (a function of capacitor ESR) are large compared to the circuit Q. A schematic of a symmetrical twin-tee circuit is shown in the figure. The design equations are as follows:...
January 21, 2002[Ideas For Design] Wideband Filter Only Has Two Different Components
Wideband filters with bandwidths in excess of an octave can be created by cascading a high-pass filter and a low-pass filter. In this design idea, nine-pole high-pass and low-pass filters have been constructed using a modified equal-element design. A...
August 7, 2000[Ideas For Design] Designing Extended-Range Toroidal Inductors
Toroidal inductors are often used in passive filter and equalizer circuits in the 1- to 100-MHz range. For appreciable relative permeabilities and moderate circuit selectivities, stray magnetic fields are sparse1. Coils can be adjusted to...
