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On 11/06/2024 7:27 am, legg wrote:On Sat, 8 Jun 2024 03:29:11 +1000, Bill Sloman <bill.sloman@ieee.org><snip>
wrote:
On 7/06/2024 11:24 pm, legg wrote:On Fri, 7 Jun 2024 14:03:16 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
>On 7/06/2024 4:05 am, legg wrote:On Thu, 6 Jun 2024 23:18:12 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
>On 6/06/2024 1:46 pm, legg wrote
>>
Right, I see Q2 normally inverted.
C2 seems unneccessarily loaded.
If you are talking about the .asc file I posted on the 3rd June, Q2
isn't "normally inverted" - its mostly on, and it gets turned off for
the 30nsec in which the stretched pulse is being generated. Inverted
operation of a bipolar transistor is usually taken to mean running
current through them in the opposite direction than is seen in normal
operation.
>
C2 isn't carrying any current worth worrying about. It stabilises the
voltage at the base of Q3 against the base current drawn when the output
pulse is turned on and turned off, -6.7mA when it is turned on an +2mA
when it is turned off, and holds the voltage excursion down to 3.7mV,
not that I ever bothered working this out.
>
If you want to discuss when the circuit does and how it does it, feel
free, but this wasn't a good start.
>
--
Bill Sloman, Sydney
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