Alfred Powell Morgan’s first, second, third and forth books of radio and electronics where once among the most loved beginning electronics hobby books. A motivated tween could build the projects with minimal mentoring. Building these same projects today requires assistance from a mentor with substantial vintage part acquisition and substitution skills.
Date 8/30/06 Simon and delabs Simon: hello, delabs: hello
Simon: we have many meanings for saturation, delabs: means turning on, also means no longer linear, or it is got fixed up, not varying in accordance to any formula
Simon: that is what is concluded of. but we just wanted to be sure. delabs: like you put salt in water. after some time no more salt can be dissolved, that is the state of saturation, In Electrical, no more relationship with V - I - R. Any increase in voltage or reduction it is same
Simon: thanks delabs: anytime
Bipolar transistors are so named because their operation involves both electrons and holes. These two kinds of charge carriers are characteristic of the two kinds of doped semiconductor material; electrons are majority charge carriers in n-type semiconductors,
This concludes this episode of Saturated Talk with Simple Simon. Next week, a new Episode which will cover effects of Lightning Bolts.
Transistor Operation - A transistor in a circuit will be in one of three conditions. Cut off (no collector current), useful for switch operation.In the active region (some collector current, more than a few tenths of a volt above the emitter), useful for amplifier applications.
"Saturation also implies that a large amount of minority carrier charge is accumulated in the base region. As a transistor is switched from saturation to cut-off, this charge initially remains in the base and a collector current will remain until this charge is removed by recombination."
One thing tho, i would like to request you to send me some procedures on how to work with surface mount devices (SMD's). I cant get the IC as DIP so i have no choice but improvise an SMD. What is your most professional advice on this? Is it possible you could help me with any procedures for using an SMD on a PCB circuit?.
An SMT component is usually smaller than its through-hole counterpart because it has either smaller leads or no leads at all. It may have short pins or leads of various styles, flat contacts, a matrix of solder balls (BGAs), or terminations on the body of the component.
By Dean F. Poeth, II, Ph.D., P.E., C.Mfg.E.
For the Small Manufacturer and Hobbyist: Prototype Manufacturing, Rework, and Repair Techniques
SMDs have improved performance over through-hole components due to their smaller size, shorter internal leads, and smaller board layouts. These factors reduce the circuit’s parasitic inductance and capacitance. SMDs can also be more cost effective than traditional through-hole components due to the smaller board size, fewer board layers, and fewer holes.
What is Surface Mount Technology? Put Simply - It is a type of electronic component
package. Most electronic components can be divided into two categories - through hole (TH)
and surface mount (SM). Through-hole components have been used for many years and are
designed to be loaded on one side of a printed circuit board (PCB) and soldered on the other.
SM components are designed to be loaded and soldered on the same side of the PCB.
Luke Enriquez. Rev 1.3. August 2001.
VK3EM PO Box 98, Kerrimuir, Vic. 3129. Australia
A component with one or two connections to the PCB can usually be removed by heating one joint, pulling out an end of the component while the solder is molten (bending the other lead to do so), and repeating for the second joint. Solder filling the hole can be removed with a pump or with a pointed object made of a material which solder does not wet, such as stainless steel or wood.
One of the most frustrating parts of building electronic circuits is getting something wrong. For a board that should take ten minutes to put together, you could spend an hour just trying to fix a component that you got backwards. Sadly, desoldering it’s not as easy as soldering in reverse.
Desoldering requires two main things: a soldering iron and a device to remove solder. Soldering irons are the heat source used to melt solder. Irons of the 15W to 30W range are good for most electronics/printed circuit board work.