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II want to sell 464 qty RCA TIP41A NPN silicon transistors-do you know of any purchasers?

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Put 'em on eBay and see who bites.

Posted on Mar 26, 2011

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When power is turned on, standby light comes on normally, but in any playing mode, the receiver switches off and the standby light flashes.


It looks like this is a common problem with a lot of the Sherwood Receivers. I've had the same problem with my R-125RDS for a while now. Finally hit on solution today by replacing a power transistor. The transistor in question is not on the power amp board but instead screwed to the chassis and wired to the mainboard. I believe it is part of the output short protection circuit. In my case the component was a 2SD2059 (silicon NPN 100V,5A) replaced by equivalent 2SD1407. The transistor seems to run pretty warm so I guess this is why they ultimately fail after a few years.

Sep 17, 2011 | Sherwood RX-5502 Receiver

Tip

Silicon (Part 1)


Silicon is the base material in a great deal of computing equipment. It has been used extensively for decades and is a material that Engineers and Scientists understand well and can easily manipulate. Advances in this manipulation has led to both increased speed and reduced size of complex computing equipment. In this article, I'll explain how silicon is used in computers and in the next couple of articles I'll talk about some potential replacements for silicon and the benefits and drawbacks of each of them.
In computer chips and transistors silicon is known as a semi-conductor. But silicon by itself is not a semi-conductor; in fact it's an insulator. This is due to the chemical structure of the element Silicon. Silicon has 4 valence electrons (outer electrons that can participate in the forming of bonds with other atoms), this allows silicon atoms to form strong covalent bonds with other silicon atoms with no free electrons as a result of the bond. This means that when electricity is applied to silicon there is no way for it to travel through the material, because there are no free electrons.
A covalent bond is a special chemical bond between atoms formed when the atoms share one or more outer electrons.
So how can silicon be used as a conductor? Silicon can become a semi-conductor through a process known as doping. There are two kinds of doping used. The first kind is referred to as N-type. In this type of doping either phosphorous or arsenic is added in very small quantities to the silicon. Both phosphorous and arsenic have 5 outer electrons so when they form covalent bonds with silicon atoms there becomes a free electron. Even a small amount of phosphorous or arsenic can produce enough free electrons for silicon to become a semi-conductor. These free electrons will give the doped silicon a negative charge; that's why this type of doping is called N-type.
Another type of doping is called P-Type. In this type of doping either boron or gallium is used to bond with silicon. The difference with this type of doping is that boron and gallium each have three outer electrons. So, when the covalent bonds are formed with silicon atoms there is a 'hole' that is formed. This absence of an electron gives the effect of a positive charge (hence the 'P-type' name) which is really the opposite of the N-type doped silicon.
By themselves these doped silicon semiconductors are not that special. However, when we put them together interesting things can happen. In figure 1, there is a P-type silicon block next to an N-type silicon block. At first glance this might look a little weird. We have what looks very much like positive and negative charges next to each other - wouldn't the electrons travel to the positive side to balance out the charges?

multilinkent.jpg
Figure 1: P-type and N-type silicon forming a diode
No. The electrons of the N-type silicon will not travel to the P-type silicon to balance out the charges. This is because of the band gap. By itself the amount of charge is not high enough to encourage mobility of the electrons. This band gap allows us to do some amazing things with the doped silicon.
If we put N-type silicon next to P-type silicone and combine them with a power source we can make a diode. A diode is a basic electronic device that allows electricity to flow in only one direction - the direction that supplies energy greater than the band gap of the doped silicon. Figure 2 shows the P-type and N-type silicon together in a circuit with a power source. When the power source is in the right direction electricity will flow through the diode, when it is in the wrong direction electricity will not flow.

multilinkent_0.jpg
Figure 2: a diode connected to a power source
It's worth noting here that if the power source is large enough, then the diode will fail and electricity will flow in either direction. This is because there is also a band gap in the opposite direction, while it requires a much greater amount of energy to surpass the band gap, it is not infinite.
Diodes are a very simple, yet highly valuable and often used electronic component. However, one of the most important electronic components made with silicon is the transistor. To make a transistor with doped silicon we can combine the doped silicon into a sandwich of sorts. These types of transistors are called "Junction Transistors", and there are two kinds of these junction transistors. There is an NPN kind which has P-type silicon sandwiched between two N-type silicon pieces. There is also the PNP type of junction transistor which has N-type silicon sandwiched between two P-type silicon pieces. These two types of junction transistors are basically the same except that they operate with the reverse polarity of the other.
So to consider how this works, let's just examine the NPN type junction transistor. If you remember when I was explaining the diodes you might think that this looks like two diodes back to back which would stop electricity from flowing in either direction - you'd be right. However, if we apply a small electrical current to the middle P-type silicon (often referred to as the 'base') we can allow current to flow from one N-type silicon (often referred to as the 'collector') to the other N-type silicon (often referred to as the 'emitter'). Likewise if we remove the electrical current from the base the current from collector to emitter will stop. This type of action allows us to use this junction transistor as a simple switch. It is simple switches like this that we can combine together to form more complex logical gates.
multilinkent_1.jpg
Figure 3: a diagram of an NPN junction transistor
Another type of transistor we can make with doped silicon is called a Field Effect Transistor or a FET. There are a couple of subtypes of FET transistors, but they each work basically the same way. In a FET transistor only two types of doped silicon are used, and N-type and a P-type. This type of transistor takes advantage of the magnetic field created along with any current. Basically a FET transistor will allow electricity to flow through one type of silicon which is used as the channel. When electricity is applied to the other type of silicon a magnetic field is produced which interferes with the current flowing through the channel thus significantly reducing it. By utilizing this magnetic field effect we can use the FET as a switch in much the same way as I explained we could use the junction transistor as a switch.
So that's a simplified explanation of how silicone is used in electronic components, including computer chips and processors of all sorts. You can see how improving the electrical performance characteristics and decreasing the size of these components can have dramatic effects on the performance and size of the finished computer parts. However, as you reduce the size of silicone enough the physical properties start to change, making it more difficult to achieve the desired results. In my next article I'll discuss this along with some alternatives to silicon that are currently being explored.

on Jun 09, 2011 | Computers & Internet

1 Answer

What is full meaning of the following codes in design and constructing an inverter-NE55,CD4013,JRC455,A733,IRFP150,1N4007,C945.


These numbers are the identification of some electronic devices that probably are being used in the inverter's circuit:

CD4013 - Dual D Flip-Flop integrated circuit
1N4007 - 1 A rectifier diode
IRFP150 - power MOSFET
A733 (2SA722) - PNP silicon transistor (low frequency amplifier)
C945 (2SC945) - NPN silicon transistor (low speed switching)

I could not find the devices marked JRC455 and NE55 - maybe they were not correctly marked, but there are some devices which have similar designations: JRC4559 is a dual operational amplifier integrated circuit and the NE555 is a time/oscillator integrated circuit.

You can download their datasheets from

http://www.alldatasheets.com

Hope this information can be useful!

Mar 09, 2011 | Electronics - Others

1 Answer

I HAVE APEX GT2015DV WITH HORIZONTAL OUTPUT BAD I NEED CROSS TO CHANGE IT I CANT FIND D2102 HORIZONTAL ANY BODY KNOW ANY REPLAC3EMENTO FOR D 2102 THNKS IN ADNVANCE


If it's transistor then, look for 2SD2102:
2SD2102 - SILICON NPN TRIPLE DIFFUSED LOW FREQUENCY POWER AMFPLIFIER - Hitachi Semiconductor.N Sabre

Nov 07, 2009 | Apex Digital Televison & Video

1 Answer

The monitor on shows black screen only


Hello

We sell a full parts kit that comes with both 40T03GPs and the pico fuse that needs to be replaced and the 2 capacitors, the kit runs $16.00 and free shipping. If you want to purchase one go to:
www.ccl-la.com/LCDrepair1.htm , that link also has the repair guide showing where the fuse and caps need to be replaced.

Buddy
Corporate Computer
www.ccl-la.com

Jul 14, 2009 | Acer AL1916W 19" LCD Monitor

1 Answer

C5707 available at?


from an old post (at Dell):
The TIP3055 handles about 70V and 10 Amps and is an NPN, so I decided to purchase four 2N3055 TO220.

from another one:
was able to successfully directly substitute MJE3055 NPN transistors for those on the original board

They are "equivalent", but (much) bigger: you must do some bending for them to fit inside the chassis

Ro

Sep 09, 2008 | Dell E172FP 17" LCD Flat Panel Monitor

1 Answer

Pioneer amph sa 9500 II


Hi yalazogeday

Your amp is fitted with two 2SD588A (NPN) and two 2SB618A (PNP) power transistors in the output stages. Click on the part for a place to get them from. These parts are no longer available from Pioneer, nor are the prescribed replacements. (the amp was built in 1978) Because of the unusual transistor package used, you may have to upgrade to a more modern transistor, and modify the mounting also.

robotek


May 24, 2008 | Audio Players & Recorders

2 Answers

Green glow


Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.hdtvoice.com/voice/showthread.php?t=28929
Or send to ptscorp.com
http://www.hdtvoice.com/voice/index.php?s

Feb 21, 2008 | RCA P46921 46" Rear Projection Television

2 Answers

Bose Radio doesn't turn on


The problem is a shorted NPN surface mount transistor on solderside of the PCB. It is located underneath of R402.

This transistor is used to switch power to the unit.

 

Hap Nguyen

nguyen_6@earthlink.net

Sep 26, 2007 | Bose Wave Radio

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