PicoMite VGA check


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robert.rozee
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Joined: 31/12/2012
Location: New Zealand
Posts: 1987
Posted: 01:24pm 19 Jan 2022      

  matherp said  
  Quote  but believe it should give good results.


What's the voltage across a BJT transistor when it is turned on? Seems to me you will be pulling the BAT141 to 0.7V i.e. zero impact


you are confusing Vbe with Vce.

Vce(sat) of a BC547 is around 90mV. there may be better choices that yield an even lower value. as i said, i've not tried the circuit.

addendum: have a dig around here:
https://www.onsemi.com/products/discrete-power-modules/general-purpose-and-low-vcesat-transistors


cheers,
rob   :-)
Edited 2022-01-19 23:26 by robert.rozee