Discrete Passive

Capacitors, Resistors, Zeners, Diodes, Bipolar Transistors, FET.

Riedon’s Technical Information

Nov 132010

Here are some documents that will build your awareness on how Resistors work and their Thermal behavior. These are from a firm called Riedon who design manufacture custom resistors and special resistors used in tight design requirements.

Riedon’s Technical Information

Resistors are probably the most common and well known of all electrical components. Applying a resistor to a circuit normally requires (1) calculating the nominal values needed in the circuit application (resistance, power rating, etc.) then (2) developing acceptable tolerances for the resistor that ensure it will function properly in all extremes of the application.

Temperature dependence and TC – The absolute ohmic value of a resistor is temperature-dependent.

Definition of terms in the specifications of Resistors. Definition of Terms

Interface – @riedonresistors

Electric double layer capacitor an eFlywheel

Discrete Passive, Power Electronics No Responses »

Aug 042009

The Electric double layer capacitor has the main use of a Charge Reservoir. That means a large amount of electrical charge in a small footprint.

These charge/discharge quickly unlike the battery, There is no Electrical Energy to Chemical Energy Transformation and back, like in batteries. It may need caution in design and usage as they may carry a lot of punch.

Also known as Ultracap, Goldcap, Supercap – Electric double layer capacitor, In Farads, like batteries, Energy Reservoirs or eFlywheel.

In Product Safety terms; The Battery has a Internal Resistance, but a Supercap does not. When used in Values like 100F and is fully charged, an Internal or External Breakdown of Insulation or Short Circuit may Occur. The Heat Generated is Enormous. Murphy’s Law says such things happen. Can someone explain more about it to me here at delabs Tweeter. I will echo it in this post. I am not yet conversant about many emerging technologies; i have not put it to practice or built test prototypes.

Reference -

Manufacturers -

by Anantha Narayan – delabs

Design Notes – Components Selection – 05

Basic Electronics, Discrete Passive Comments Off

Jan 152009

Selecting the parts for your product design, choosing the components intelligently is a part of Product Design Engineering. Budget, Availability, Size, Alternate Vendors, Product Life and Quantity to be manufactured are some factors that determine the selection of a prudent and experienced design professional. To choose the right type of part, an exhuastive knowledge of the behaviour of passives and discretes is essential. Some points i remember among the things that i learnt the hard way are listed below. Over rate components at least double, if you need a 1A-100V-100uS diode, use a 2A-200V-50uS diode. Electrolytic capacitors have a shelf [Read More ....]

Circuits using only discrete devices

Circuits, Discrete Passive No Responses »

Oct 182008

Here are circuits made of Resistors, Capacitors and Inductors which are passive components. Crystals, Thermistors, Varistors, Variable Passive RLC are also Passive Parts. Zeners, Diodes, NPN-PNP Transistors, FET, MOSFET, SCR, Triacs are all discrete active devices. Circuits using only discrete devices Isolated dual power supply from 5V Telephone LED status indicator Music Sound to light converter Simple Water operated relay LED Voltage Level Indicator Basic Relay or Solenoid Driver Mains Voltage Current LED Indicators Triac based Lamp Dimmer power control More discrete devices circuits below Neon Flasher circuit Voltage Doubler to boost 3V FET Current Source Constant Current Source LED [Read More ....]

Potentiometers and Trimpots

Discrete Passive No Responses »

Sep 252008

Potentiometers, Rheostats, Trimpots, Presets are Variable Resistors. These are user interface devices. When a user turns a dial on a Panel it moves a wiper on a resistor film or wire-wound former. The variable resistors are also used to calibrate circuit sections on a board. These are used for either to obtain a precision or to offset errors due to circuit variations and decay of components on aging. Potentiometers Samples 20 Turn Bourns Single Turn Wire-Wound Single Turn Film 10 turn Spectrol Precision, Linear Temperature Stability Instrumentation Many Operations Panel Control Encoders Panel Control 1 Watt Wire Wound Temperature Stable [Read More ....]

Resistors and How they Work

Discrete Passive No Responses »

Sep 162008

Resistors were first made by winding thin high resistance alloy wires on a former and then encapsulating it. This method is still used for high wattage resistors. One example is a rheostat, the other that still is used is a wire wound potenmtiometer. Then we have carbon film, which means a very thin carbon film is coated on a porcelain/alumina/ceramic former. This is done at a very high temperature. Then using precision abrasion tools, groves are cut on in, like scratches tiil the desired resisatnce is obtained. This method is useful from 1/4 w to say 2w resistors for commercial [Read More ....]

Coils and Transformers for SMPS

Discrete Passive, Power Electronics No Responses »

Sep 112008

Coil Winding Specialist Coil Winding Specialist Coil Winding Specialist Coilcraft, Inc Coilcraft, Inc Toroid Inductors Axial-Radial Coils EE Core Transformers Pot Core Trx Drum Core Coil High Q Low Cost Difficult to Wind Easy To Mount Very Low Cost Low Q RF Radiation Easy to Wind High Power and Q More Pins, Robust Air Gap Adjust Split Bobbin Too Shielded Adjustable High Q Fragile Low Profile Small Footprint Insulated Easy Mount Application Notes of CWS Design Tools Coilcraft mobius winding techniques Switch Mode PS Transformers Producing wound components Ferrite Inductors educational encyclopedia inductors Power Transformer Inductor Switch Mode Power Supplies [Read More ....]

Principles of Semiconductor Devices

Discrete Passive No Responses »

Sep 102008

Principles of Semiconductor Devices The purpose of this text is to explore the internal behavior of semiconductor devices, so that we can understand the relation between the device geometry and material parameters on one hand and the resulting electrical characteristics on the other hand. Schottky diode current Metal-Semiconductor contacts Electrostatic analysis of a p-n diode Reverse bias breakdown Optoelectronic devices Light Emitting Diodes (LEDs) Ideal transistor model MOSFET SPICE MODEL Power MOSFETs

Types of Capacitors

Discrete Passive No Responses »

Sep 062008

Capacitors are as simple as two plates of metal separated by a insulator called dielectric. When you make large values of capacitors, just two films or plates will not do, so long strips of metalized films used to get bigger values. Electrolytic capacitors use an electro chemical phenomena to form a very thin dielectric in microns, this enables large values in small size. Capacitors Samples Ceramic Mica Plastic Plastic 10pf-1uF Leaks a Little. Temperature Sensitive. Unpolarized. Ceramic Dielectric. NPO stable. Radial. Unpolarized. Mica Dielectric. Costly. Stable. ~100pF Negligible Leakage. Temperature Tolerant. Unpolarized. Plastic Dielectric. 1nf-10uF. Radial. Axial. Plastic Dielectric. Unpolarized. [Read More ....]

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