What is best BC547 or 2N2222? - Electronic Circuits Projects Diagrams Free

Suraj143 · 31st October 2007, 04:39 AM

In JDM programmers the two transistors they used BC547 in mostly.

I made the same circuit with 2N2222 transistor but it didn’t work. But the programming software detects the programmer. But I cannot read the PIC & program the PIC.

Gordz · 31st October 2007, 07:35 AM

Do you have a 'scope so that you can check what is happening ? Perhaps you have the 2N2222 in the wrong way around.

Suraj143 · 31st October 2007, 08:36 AM

oops I don't have a scope. I have checked twice the base collector & emitter of 2N2222 & they seems to be ok.

I haven't see a programmer that build with 2N2222 all JDM types using BC547.

I want to clarify whats the different between them.

Our town is far away until I go there I have to bare with this 2N 2222.

mvs sarma · 31st October 2007, 09:02 AM

Quote:

Originally Posted by Suraj143

oops I don't have a scope. I have checked twice the base collector & emitter of 2N2222 & they seems to be ok.

I haven't see a programmer that build with 2N2222 all JDM types using BC547.

I want to clarify whats the different between them.

Our town is far away until I go there I have to bare with this 2N 2222.

you can verywell use BC547 as it works very cheap . only the pin out need be checked while mounting the component.

**Nigel Goodwin** · 31st October 2007, 10:07 AM

All it requires is a general purpose silicon transistor of the correct polarity, pretty well anything will work, it's only used as a simple switch. As suggested, you may be connectng it the wrong way?.

Suraj143 · 31st October 2007, 10:15 AM

OK guys I'll take a look again & tell where is wrong.Thanks for your ideas.

mvs sarma · 31st October 2007, 12:54 PM

The suggestion is not, i fear, for connecting in wrong way please--(in lighter sense)

the author FENG himself was clarifying at his site how not to connect.

Suraj143 · 1st November 2007, 04:49 AM

Hi I replaced my 2N2222 to BC 547 & it worked for 84A & 628A through ICSP connector.

But when I try to program 877A it won't program through ICSP connector.

Note: I didn't use the PGM pin only using the standard 5 pins that is Vdd, Vss, PGD, PGC, MCLR

Also in 877A has two VDD & two VSS pins each.I use only one VDD & one VSS.

I'm using ICPROG 1.05 & winpic.

Gayan Soyza · 1st November 2007, 05:28 AM

Quote:

Originally Posted by Suraj143

Note: I didn't use the PGM pin only using the standard 5 pins that is Vdd, Vss, PGD, PGC, MCLR

Try RB3 connecting to ground without making that pin to be float.

**Nigel Goodwin** · 1st November 2007, 08:38 AM

Quote:

Originally Posted by Suraj143

Also in 877A has two VDD & two VSS pins each.I use only one VDD & one VSS.

Have you checked if they are joined internally?, I didn't think they were?, so ensure you connect all of them.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
An optoisolator replacement for 2n2222	William At MyBlueRoom	General Electronics Chat	2	14th May 2006 05:51 AM
is the pn2222 transistor the same as a 2n2222 transistor?	colin886	Datasheet/Parts Requests	2	6th January 2006 06:41 AM
Help needed - transistors not working	Jackboy	Electronic Projects Design/Ideas/Reviews	5	26th February 2004 07:50 AM

31st October 2007, 04:39 AM	(permalink)
Suraj143	What is best BC547 or 2N2222? In JDM programmers the two transistors they used BC547 in mostly. I made the same circuit with 2N2222 transistor but it didn’t work. But the programming software detects the programmer. But I cannot read the PIC & program the PIC.

31st October 2007, 07:35 AM	(permalink)
Gordz	Do you have a 'scope so that you can check what is happening ? Perhaps you have the 2N2222 in the wrong way around.

31st October 2007, 08:36 AM	(permalink)
Suraj143	oops I don't have a scope. I have checked twice the base collector & emitter of 2N2222 & they seems to be ok. I haven't see a programmer that build with 2N2222 all JDM types using BC547. I want to clarify whats the different between them. Our town is far away until I go there I have to bare with this 2N 2222.

31st October 2007, 10:07 AM	(permalink)
Nigel Goodwin	All it requires is a general purpose silicon transistor of the correct polarity, pretty well anything will work, it's only used as a simple switch. As suggested, you may be connectng it the wrong way?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

31st October 2007, 10:15 AM	(permalink)
Suraj143	OK guys I'll take a look again & tell where is wrong.Thanks for your ideas.

31st October 2007, 12:54 PM	(permalink)
mvs sarma	The suggestion is not, i fear, for connecting in wrong way please--(in lighter sense) the author FENG himself was clarifying at his site how not to connect. __________________ Regards, Sarma.