by Leland Teschler, Executive Editor A novel ac rectification and coil-driving scheme may characterize the electronics found in this widely used oral hygiene instrument. The Philips Sonicare Elite series toothbrush is billed as generating over 31,000 brush strokes per minute thanks to “sonic motion” driving its brush. A teardown reveals what Philips is talking about […]
Resistors
Varistors give intrinsically safe overvoltage protection
TDK Corporation presents the new T series of EPCOS ThermoFuse varistors for intrinsically safe overvoltage protection. These components are based on disk varistors with diameters of 14 mm (T14 series) and 20 mm (T20 series) that are connected in series with a thermally coupled fuse. The T14 series (B72214T*) covers the voltage range from 130 VRMS […]
SMT shunt resistors handle current sensing
TT Electronics has launched the LRMAP3920 series of high reliability, low value SMT shunt resistors for current sensing duties. With values down to 200μΩ and a power rating of 5W on FR4 fibreglass circuit boards, the maximum measurable current is over 150A, and in most cases is restricted only by the current handling of the […]
New high temperature current sense chip resistor-UR73V
KOA Speer Electronics introduces the new UR73V, 1206 size thick film current sense resistor with a high operating temperature -55°C +155°C. The UR73V2B is AEC-Q200 qualified and has a 0.5W power rating and a resistance range of 10mΩ ~ 100mΩ. With a standard tolerance of ±1.0%, and T.C.R. values of +100ppm/°C and 0 ~ ±250 […]
New high power low Ohm resistor in 0612 Size
KOA Speer Electronics introduces the new WU73, a 1-Watt wide terminal low ohm chip resistor available in an 0612 package. The WU73 is a precision resistor offering resistance values from 10mΩ to 100mΩ with a standard tolerance of ±1%. The WU73 chip resistor features wide side electrodes which provide better heat dissipation and smaller size […]
TT Electronics’ SMT power inductors certified for automotive applications
TT Electronics has launched a new range of surface mount (SMT) power inductors for high frequency and high temperature applications. Named the HA65A series, the inductors are designed to meet the requirements of the growing automotive market’s need for certified, high power inductors specifically for buck, boost or buck-boost power converter topologies for optimum voltage […]
Top power electronics threads on EDAboard.com – October
Industrial grade robust inverter build – I have done a lot of research online about IGBTs, gate drivers, blown up many IR2110s, studied PCB layout considerations, OC/SC protection, current sensors and so on but none of my designs has ever lasted for long when loaded by an actual motor. The waveforms were perfect, but smoke was […]
SLN3 molded current sense resistor offers 3-W power rating
KOA Speer Electronics introduces the new SLN3 molded current sense resistor, featuring a 3-Watt power rating in 4528 size. The molded resin resistor provides excellent dimensional accuracy, mountability and shock resistance. Due to its metal plate terminal electrode, it also offers excellent terminal strength, heat and shock resistance and solderability. KOA Speer’s SLN3 resistor has […]
Working with Wirewounds
by Kory Schroeder, Director of Product Marketing and Engineering, Stackpole Electronics Inc. For high currents, axial-leaded wirewound resistors are often good candidates because they can handle up to 10 W and double as fuses. When a task calls for dissipating kilowatts of power over an extended period, wirewound resistors are often a logical choice. These […]
Current-sense resistors handle 2 W
KOA Speer Electronics introduces the new TLR2HW metal plate chip current sense resistor in a 2010 size, featuring a 2-watt power rating and ultra low resistance of 1m to 10m. The metal alloy of the TLR2HW provides superior corrosion and heat resistance, with small size SMD type metal plate providing low resistance for current detection. […]
