2N2222A NPN transistor as Current Amplifier

Papabravo

Well-Known Member

Most Helpful Member

• Nov 10, 2024

• #2

Words are failing you. Schematic diagram please.

 

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Lightium

Active Member

• Nov 10, 2024

• #3

Your abbreviations are fictitious and only proper schematics are the language of electronics around these parts.

 

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A

aliarifat794

Active Member

• Nov 11, 2024

• #4

Check all of your connections. There may be a loose connection or short circuit.

 

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Pommie

Well-Known Member

Most Helpful Member

• Nov 11, 2024

• #5

Where is the 0.9V coming from, what amperage is available at 0.9V. What current does the relay require?

Mike.

 

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rjenkinsgb

Well-Known Member

Most Helpful Member

• Nov 15, 2024

• #6

erashish14 said:

also +ive of Load with collector of transistor & -ive of Load to emitter of transistor

Click to expand...

The load negative should be to the collector, and the load positive to +5V

With the connections you describe, the load is never getting any power to it.

 

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Pommie

Well-Known Member

Most Helpful Member

• Nov 15, 2024

• #7

I suspect this is another circuit that will turn 1mA into several Amps from a tiny 9V (@1mA) source.

Mike.

 

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Lightium

Active Member

• Nov 16, 2024

• #8

If I may ask a question here, what is +ive?

 

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Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 16, 2024

• #9

Lightium said:

If I may ask a question here, what is +ive?

Click to expand...

I'll doubt you'll get an answer, but it seems pretty obvious he meant positive (+ve), perhaps to do with his native language?.

 

Last edited: Nov 17, 2024

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Tony Stewart

Well-Known Member

Most Helpful Member

• Nov 16, 2024

• #10

You are only amplifying the base current to emitter and not boosting the available max current from USB.
This is not what you expected because it cannot boost the max USB current available. Instead you may have fried your base-emitter diode which has a smaller current limit. This is a failed concept.

 

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