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For down-hole drilling applications, Vishay’s new CHPHT surface-mount, wraparound thick film chip resistor is the industry’s first such device to feature an operating temperature to + 230 °C and storage temperature to + 245 °C. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)
9/18/2013. VPG's Vishay Foil Resistors brand (VFR) releases a new series of high-precision foil surface-mount current sensing flip chip resistors with low TCR down to ±10 ppm/°C from -55°C to +125°C, +25°C ref.; resistance down to 0.001 Ω; and tight tolerances to ±0.5%.
This is a switching power supply which probably cost about £30 from China. It's failure has killed a two grand display screen, and you can't get replacements.
Dave reckons one of the adjacent transistors has gone causing some spectacular overheating and burnout of this damaged resistor.
The problem we face is that we moved into a new building five and a half years ago and most of the stuff was new. That means it was bought and installed at the same time, and that means it all starts failing at about the same time too.
All good fun.
A cube of resistors, drawn on paper, but when I touched them with my finger, they sprang to life!
Drawn for The Daily Create tdc1277, a Creative Educational Activity of ds106.
This is what it looks like inside the speed control assembly after about 30 years of constant use. Note that the resistor, which should be installed in the upper part of the assembly, has been removed.
You can see the capacitor installed in the lower part of the assembly; it's the brown cylinder with numbers and letters on the side. The original resistor is also cylindrical, though made of a ceramic material, and fits between the open connectors you can see in the top portion of the assembly.
Yesterday I decided to make a theremin, I used a kit which comes from PAiA with all resistors, transistors, ICs, capacitors, circuitboard, etc. It was my first electronics-building experiment and my first time soldering. 6 hours later, this is what I had
www.hiconics-global.com/products/660v-0.4-800kw-construct...
Safety and reliability: special logic holding brake timing control ensures the safety and reliability of the lift. Brake resistor short-circuit protection: the built-in brake unit has a resistor short-circuit protection function. Frequent jogging and smooth operation: zero dead zone compensation function for frequent jogging operation, no vibration and slippage.
Specification of 660V/0.4-800kW Construction All-in-one Machine
ItemSpecifications
Main control
functionsMaximum
frequencyVector control: 0~600Hz
VF control:0~1200Hz
Carrier Frequency1k ~ 15kHz; the carrier frequency will be automatically
adjusted according to the load characteristics.
Input frequency
resolutionDigital setting: 0.01Hz
Analog setting: maximum frequency ×0.1%
Control modeOpen loop vector control ;
V/F control.
Start-up torqueMode G machine: 0.5Hz/180% (open loop vector control)
Mode P machine: 0.5Hz/120% (Open loop vector control)
Speed adjustment
range1：200（Open loop Vector flux control）
Main control
functionsStable speed
PrecisionOpen loop Vector flux control：≤±0.5% (rated synchronous
speed)
Stabilization of
speed controlOpen loop Vector flux control：≤±0.3% (rated synchronous
speed)
Torque response≤40ms(Open magnetic flux vector control)
Overload capacityMode G machine: 150% rated current 60s; 180% rated current 5s
Mode P machine: 130% rated current 60s; 150% rated current 5s
Torque boostAutomatic torque boost; manual torque boost 0.1% to 30.0%
V/F curveLinear V/F, Multi-point V/F, and Square V/F
Speed-up andStraight line or S curve speed-up and speed-down mode;
four kinds of speed-up and speed-down time;
Speed-down curveSpeed-up and speed-down time ranges from 0.0s
to 3000.0s
DC brakeDC brake frequency: 0.00Hz ~ maximum frequency; brake time: 0.0s ~ 36.0s, and brake current value: 0.0% to 100.0%.
Jog controlJog frequency range:0.00Hz ~ 50.00Hz;
Jog speed-up/speed-down time: 0.0s ~ 3000.0s.
Simple PLC and
multi-speed runningIt can realize a maximum of 16 segments speed running via the built-in PLC or control terminal.
Built-in PIDIt is easy to realize process-controlled close loop control system.
（AVR）Automatic
voltage regulationIt can keep constant output voltage automatically in case of change of mains voltage.
Torque limit and
control"Shovel" characteristics, automatic limit on the torque on running time, preventing frequent over-current trip; closed loop vector mode can realize the torque control
Customized functionsPeripherals
self-detection upon
power-onIt can conduct safety detections on the peripherals upon power-on, including earth and short circuit detections.
Shared DC bus
functionIt can realize the function that multiple inverters share the DC bus.
JOG keyProgrammable key: Select the forward and reverse rotations/jog operation command.
Traverse frequency
controlMultiple triangular-wave frequency control function.
Fast current limit
functionWith fast current limit algorithm built in to reduce the probability of over-current alarm; to improve the anti-jamming capacity of the whole machine.
Timed controlTiming control function: Setting time range from 0h to 65535h.
Keyboard extension
line standardizationCustomers can use standard cable to extend the keyboard
Operation
functionRunning command
channelThree types of channels: operation panel given, control terminal given and serial communication port given. These channels can be switched in various ways.
Frequency sourceTen types of frequency sources in total: digital given, analog voltage given, analog current given, pulse given, and serial port given. It can be switched in various ways.
Auxiliary frequency
sourceTen types of auxiliary frequency sources in total. It can implement micro tuning and synthesis of auxiliary frequency.
Input terminalSeven digital input terminals, and nine terminals in maximum
(AI1, AI2 can be used as DI terminals), it has compatibility to
PNP or NPN input method.
Two analog input terminals, in which AI1 only be used for
voltage input, and AI2 can be used as voltage or current
input. (if expanded- input or output terminal function is
needed, please use HIC580 series.)
Output terminalOne digital output terminal (bipolar output)
Two relay output terminal
Two analog output terminals, with optional 0/4mA to 20mA
or 0/2V to 10V. It can realize the output of set frequency,
output frequency and rotation speed etc.
Display and Keyboard
OperateLED displayDisplay parameter
LCD displaySelective parts, Chinese/English to suggest the operation
content
LCD Parameter copyUse LCD parameter special copy keyboard can copy the
parameter quickly
Key lock and
function chooseLock part of the keyboard or the whole keyboard, definite the
function range of some keys to avoid mis-operation.
Protection
and select
accessoriesprotection functionShort circuit detective of power-on motor, input and output
open-phase protection, over-current protection, overvoltage
protection, under-voltage protection, over-heat protection,
over-load protection etc.
Selective accessoriesLCD operation panel, brake group etc.
EnvironmentSuitable placeIndoor environment which is against from direct sunlight,
dust, corrosive gas, combustible gas, oil mist, vapor, water
drop and salt.
AltitudeLess than 1000m
Ambient
Temperature-10℃ ~ +50℃ (derating is required if the natural temperature
range is 40℃ ~ 50℃)
HumidityLess than 95%RH, no condensing water drops
VibrationLess than 5.9m/ s2 (0.6g)
Storage temperature-20℃ ~ +60℃
Class of pollution2
High Performance Aerospace and Instrumentation Resistors, High Ohmic Value, Small Size
High Precision Bulk Metal® Foil Extended Value Range
Resistor, with TCR of 2 ppm/°C, Tolerance to 0.005 %,
and Power Rated at 0.6 W
E102
Vishay Foil Resistors
Document Number: 63066 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 25-Mar-10 1
Any value available within resistance range
Bulk Metal® foil (BMF) technology outperforms all other
resistor technologies available today for applications that
require high precision and high stability.
This technology has been pioneered and developed by
VISHAY, and products based on this technology are the
most suitable for a wide range of applications.
BMF technology allows us to produce customer orientated
products, designed to satisfy challenging and specific
technical requirements.
The E102C (0.150" lead spacing) and E102J (0.200" lead
spacing) extends the range of the high precision aerospace
and instrumentation standard S102C/J from 150K to 300K.
Our application engineering department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact us.
FEATURES
• Temperature coefficient of resistance (TCR):
- 55 °C to + 125 °C, + 25 °C ref.
2 ppm/°C typical
• Rated power: to 0.3 W at + 125 °C
• Tolerance: ± 0.005 %
• Load life stability: to ± 0.005 % at 70 °C, 2000 h at rated
power
• Resistance range: 150 kΩ to 300 kΩ (higher and lower
values of resistance are available)
• Electrostatic discharge (ESD) above 25 000 V
• Non inductive, non capacitive design
• Rise time: 1 ns without ringing
• Current noise: < - 40 dB
• Thermal EMF: 0.05 μV/°C typical
• Voltage coefficient < 0.1 ppm/V
• Low inductance: < 0.08 μH typical
• Non hot spot design
• Terminal finishes available: lead (Pb)-free
tin/lead alloy
• Matched sets are available on request
(TCR tracking: to 0.5 ppm/°C)
• For better TCR and
Vishay Foil Resistors brand (VFR) Bulk Metal® Foil commercial off-the-shelf (COTS) resistors are increasingly in demand to meet the needs for high reliability and long-term stability in control and monitoring applications. (For hi-res version, select "View all sizes" from the "Actions" pulldown menu above.)
For high-reliability military, aerospace, and medical applications, Vishay’s new PFRR ESCC-4001/023-qualified, R-failure-rate, high-precision thin film wraparound chip resistors are the industry’s first such devices to offer TCR down to 10 ppm/°C and tight tolerances to 0.05 %. (Click ALL SIZES for hi-res version.)
Vishay’s new CS44 series of wirebondable thin film chip resistors are the industry’s first such devices to combine compact 40 mil by 40 mil (1 mm by 1 mm) footprints with high resistance to 100 MΩ.(For hi-res version, select "View all sizes" from Actions pulldown menu above.)
Added 68nF capacitors in parallel with feedback resistors to reduce the amplitude of LFOs at higher frequencies. This gives a more constant modulation depth as the LFO frequency is increased.
I removed the two 10uF capacitors on the audio output lines. You can see four holes near the output sockets where they were. I then added 470R series resistors (not seen in this photo) to the output of the final op-amps. Although this does increase output offset slightly it is still below 10mV. The resistors prevent the output op-amp from oscillating with cable capacitance. Remember I have no HPF stage on my unit and the output of the summing amplifier goes straight to the relay.
The Never forget 1-31-07 memorial kit" from Evil Mad Scientist Laboratories, an open-source LED pegboard display. Read more here www.evilmadscientist.com/article.php/peggy
Vishay’s enhanced PLT series of precision low-TCR thin film resistors features improved tolerances down to ± 0.01 % and low standard TCR of ± 5 ppm/°C in three case sizes. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)