Sounds like you have some transistor-shaped objects. I only buy parts from
Digikey and Mouser, and the occasional Adafruit purchase.
This is why.
On Fri, Feb 8, 2019, 10:00 PM Thomas Kummer No, but I just did, and it dropped 4.7V
>
> Sent from my iPhone
>
> On Feb 8, 2019, at 23:12, David
No, but I just did, and it dropped 4.7V
Sent from my iPhone
> On Feb 8, 2019, at 23:12, David Forbes wrote:
>
> An NPN transistor has about a 0.5V diode drop from base to emitter when
> turned on with a few milliamps of base current. Do you measure this?
>
>
>
>> On Fri, Feb 8, 2019, 7:08
An NPN transistor has about a 0.5V diode drop from base to emitter when
turned on with a few milliamps of base current. Do you measure this?
On Fri, Feb 8, 2019, 7:08 PM Thomas Kummer I tried a 10K and I tried a 2.2K, and a 1K, and then would ground the
> base, and still the decimal point lit
I tried a 10K and I tried a 2.2K, and a 1K, and then would ground the base, and
still the decimal point lit up!! I took the resistor off the base and touched
it with my finger, and the DP lit up!!! I’m 100% convinced that these are just
cheap knockoff Chinese counterfeits as I tried through
> My understanding is that a MPSA42 is an NPN transistor and the MPSA92 is a
> PNP. My understanding of how an NPN transistor works is that when the base
> “P” is turned on the circuit from collector to emitter is shorted. When the
> base is off the circuit is open. I’m trying to use the
My understanding is that a MPSA42 is an NPN transistor and the MPSA92 is a PNP.
My understanding of how an NPN transistor works is that when the base “P” is
turned on the circuit from collector to emitter is shorted. When the base is
off the circuit is open. I’m trying to use the decimal point
