Breadboard and meter a circuit.

Nigel Goodwin

Super Moderator

Most Helpful Member

• Today at 12:03 AM

• #2

Well it looks completely non-functional, what's with Q2 base/emitter?.

 

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Lightium

Active Member

• Today at 12:23 AM

• #3

Oh no, it oscillates at a variety of frequencies.

 

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Lightium

Active Member

• Today at 12:37 AM

• #4

Q2? The power supply is so small there is no need for biasing.

 

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Nigel Goodwin

Super Moderator

Most Helpful Member

• Today at 1:11 AM

• #5

Lightium said:

Q2? The power supply is so small there is no need for biasing.

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Q2 base emitter junction connects the supply directly to the top of R2, so the emitter of Q1 is only 0.7V below it's collector, with 2.3V just wasted across R2. I'm doubtful if it will work on only 0.7V, but in any case why use a 3V supply and throw 2.3V of it away?

 

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Lightium

Active Member

• Today at 1:29 AM

• #6

mmm, I'll keep going and look at what you say and fix it.

 

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