Amplifying 1.5v to 7v

[jeyes56]

hi, im doing some project, and i forgot how to deal with transistors..

i want to amplify my 1.5v input to around 7v output.

how to do that with some sort of transistors and resistor only? (or with capacitor).

can please someone post a circuit diagram?

 

[kinarfi]

would that be ac or dc?

 

[jeyes56]

sorry i forgot to specify. It is DC.

 

[MikeMl]

What is the supply voltage?
What transistors do you have?
What is the input signal source (impedance)?
What load does the amplifier have to drive?
Can you tolerate a fixed offset voltage between input and output?

 

[jeyes56]

supply is 9v.
I'm not familiar with transistors type, or serial. (what can you suggest?)
the load will drive a 6v relay.

"Can you tolerate a fixed offset voltage between input and output?"
i think i can't understand this statement.

 

[jeyes56]

can anyone please help me how to amplify an 1.5v to around 7v,
any simple method would do.

or with transistors.

 

[fernando_g]

The simplest method: opamp an two resistors.
You could use an LM358 in a noninverting configuration and a 10k and a 36k resistor.

 

[jeyes56]

The simplest method: opamp an two resistors.
You could use an LM358 in a noninverting configuration and a 10k and a 36k resistor.

i think op amp requires two voltage source, one is positive and the other one is negative (not ground).
and also the supply is +9v.

https://www.electro-tech-online.com/threads/i-dont-know-what-is-wrong.117593/

 

[MikeMl]

Ok, I see now that what you need is a NPN transitor used as a relay driver (not an "amplifier").

You didn't say what the 1.5V signal comes from? ( I need to know this to see how much current the source can supply to drive the base of the transistor)?

I also need to know the resistance of the 6V relay coil? (Measure it with an Ohmmeter, or look up the datasheet)

 

[ericgibbs]

hi Mike,
Its from his other like thread, here: https://www.electro-tech-online.com/threads/i-dont-know-what-is-wrong.117593/

 

[MikeMl]

hi Mike,
Its from his other like thread, here: https://www.electro-tech-online.com/threads/i-dont-know-what-is-wrong.117593/

Why do these NOOBs spread their projects across several different threads????