Hi, I'm new here and relatively new to electronics - to the analogue side at least.

I am building a Frequency Counter/Crystal Tester kit
( one of these: http://www.dx.com/p/diy-frequency-t...unter-meter-w-housing-kit-443430#.WcZIydhw1hE )

The instructions call for installing two S8550 transistors, but the parts supplied are S8050 transistors.

Looking at the specifications, these transistors have similar parameters except that the S8050 values are all negative.
Are these two actually compatible?

If not, is there any way I can tell if the component list is wrong, or the wrong parts have been supplied?

TIA, Mike

 

The S8050 is NPN while the S8550 is PNP so they are not interchangeable.
It is most likely that you have been supplied the correct parts but without seeing a schematic it is impossible to say.

 

Best check with the supplier.

 

Hi thanks for the replies.
I'd just worked out the NPN/PNP difference - because my 'Component Tester' told me

Looking at the (very poor and very feint) circuit diagram, I can just see the the Arrow on the Emitter is pointing Out of the transistor. That makes it an NPN device?

Also on the circuit, the Emitters are in one case direct to Ground, in the other case, via a resistor (10k) to ground.

Does that confirm that the parts list is wrong and the correct part has been supplied?

 

Yes, it sounds like it.

 

They are a little confusing when the id numbers are similar.

S8550,PNP,25V/500mA
http://cdn2.boxtec.ch/pub/diverse/S8550.pdf

S8050,PNP,25V,500mA
http://www.datasheetcatalog.org/datasheet/WINGS/S8050.pdf

S8050,NPN,25V/500mA
http://pdf1.alldatasheet.com/datasheet-pdf/view/154210/WEITRON/S8050.html

8050,NPN,30V,1.5A
http://www.datasheetcatalog.org/datasheet/MicroElectronics/mXyzqxst.pdf

SS8050,NPN,25V/1.5A
http://www.datasheetcatalog.org/datasheet/fairchild/SS8050.pdf

 

Hi, I'm new here and relatively new to electronics - to the analogue side at least.

I am building a Frequency Counter/Crystal Tester kit
( one of these: http://www.dx.com/p/diy-frequency-tester-1hz-50mhz-crystal-counter-meter-w-housing-kit-443430#.in a

The instructions call for installing two S8550 transistors, but the parts supplied are S8050 transistors.

Looking at the specifications, these transistors have similar parameters except that the S8050 values are all negative.
Are these two actually compatible?

If not, is there any way I can tell if the component list is wrong, or the wrong parts have been supplied?

TIA, Mike

Scroll down on the supplier's page and leave a comment. I'm sure you'll get an answer in a few minutes.

 

They are a little confusing when the id numbers are similar.

S8550,PNP,25V/500mA
http://cdn2.boxtec.ch/pub/diverse/S8550.pdf

S8050,PNP,25V,500mA
http://www.datasheetcatalog.org/datasheet/WINGS/S8050.pdf

S8050,NPN,25V/500mA
http://pdf1.alldatasheet.com/datasheet-pdf/view/154210/WEITRON/S8050.html

8050,NPN,30V,1.5A
http://www.datasheetcatalog.org/datasheet/MicroElectronics/mXyzqxst.pdf

SS8050,NPN,25V/1.5A
http://www.datasheetcatalog.org/datasheet/fairchild/SS8050.pdf

http://www.datasheetcatalog.org/datasheet/fairchild/SS8050.pdf

 

There is another more serious confusing that I forgot is S8050 has two kinds of type like as NPN and PNP, and I already re-edited my posted on #6 and your replied on #8.

 

Scott Wang's avatar looks like 3D renderings of the emoji's that you selected. Coincidence?

 

Scott Wang's avatar looks like 3D renderings of the emoji's that you selected. Coincidence?

My avatar was designed by myself used 3D max about ten years ago.

 

My avatar was designed by myself used 3D max about ten years ago.

Think how nice those renderings would look as 3D emojis - just put some weird expressions on them.

 

@MikeSW17 Get out your digital voltmeter and test the transistors to find out whether they are NPN or PNP.

How to test a transistor with a multimeter <= Link