delabs Circuits

Showing posts with label Basic-Electronics. Show all posts
Showing posts with label Basic-Electronics. Show all posts

Friday, July 14, 2017

Desoldering Methods

Dear Solderman, i hope you know how to dessolder a wave soldered component from a board. There is problem because the pins are two face soldered. - thanks

mail from JS

Sending a few sites, read them all and then tell me.

Desoldering - Wiki

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.

Desoldering Methods

How to Desolder

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.

Desoldering THM and SMT

Desoldering is a topic that no one seems to get to excited about until the time comes when people discover that a lot of damage is being done during this operation.


Sunday, April 19, 2015

What is Saturation in Transistors

Date 8/30/06 Simon and delabs
Simon: hello,anantha.
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 anan
delabs: anytime

What is Saturation in Transistors

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.

To learn more about Saturation in NPN and PNP Devices see - Transistors Williamson Labs

Transistor Operation - A transistor in a circuit will be in one of three conditions

Chapter 5: Bipolar Junction Transistors

"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."

Lessons In Electric Circuits - Bipolar Transistors
When a transistor has maximum current through it, it is said to be in a state of saturation (fully conducting).

Friday, August 22, 2014

Working with SMD and SMT PCB

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?.

mail from CM

Study These Links......... - SMD Surface Mount Device and SMT Surface Mount Technology

you may need a big tabletop magnifier with light and a fine tip soldering iron to get started. It may be difficult and needs a lot of practice, but many people are able to do it.

Surface-mount technology - Wiki

Surface-mount technology - Wiki

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.

Introduction to Surface Mount Technology and Surface Mount Devices

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.

Hints and Tips for using Surface Mount Technology (SMT) 

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