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1 vote

What is this NPN circuit doing?

Your reverse-engineering of the circuit is correct. When the input is high, the output will be high, and when input is low, the output will be low. Why it really is in the circuit is unknown, you need ...
Justme's user avatar
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2 votes
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What is this NPN circuit doing?

yeah, your analysis sounds valid: it's a buffer of sorts. Technically, it's an open collector output: when your switch is in top position, there's a very low-ohmic path from output to ground. You can ...
Marcus Müller's user avatar
3 votes

What happens when the CB junction is in forward bias and the BE junction is in reverse bias in an NPN bipolar transistor?

It's the reverse active region. You still get transistor action just like in the forward active region but since in "normal" operation the collector is lightly doped to increase the ...
vir's user avatar
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0 votes

NPN transistor as a switch configuration

Will this configuration values will okay in the long run or is a fail? and max \$I_C\$ current from 50-60 mA. It comes down to how low you want the saturation voltage to be. Consider this data ...
Andy aka's user avatar
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1 vote

NPN transistor as a switch configuration

The rule of thumb for transistor switches is to make the base current 1/10th of the collector current to force it into saturation. This would put you at around $$ R1 = \frac{V_{in}-V_{BE}}{I_B} = \...
GodJihyo's user avatar
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0 votes
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ESP12 to switch computer power

Ex 1 will not work, it won't do anything. Ex 2 should work. The only problem is, you need to know which pin on the motherboard is ground and which is the button input that should be connected to ...
Justme's user avatar
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