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I am trying to understand amplifier gain in transistor

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#85272

I am trying to understand amplifier gain in transistor | 22 July, 2020

Here in this circuit LED is placed at the collector. i am with an impression that, IE=IB+IC. so it is better to keep at the emitter, right ? all the gain of the transistors are not utilized.

What is the purpose of LED, placing at collector? Please educate me

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#85273

I am trying to understand amplifier gain in transistor | 22 July, 2020

You did not attach anything here. Transistor can be connected in different circuit(like common Emitter) and will use Collector current as output. Also Ic is about the same as Ie in value, as base current Ib is insignificant usually in uA.

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#85274

I am trying to understand amplifier gain in transistor | 22 July, 2020

Jetting Pump for Integration

Metcal soldering rework