I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18
Capacitors C8, C14 & C18 no value is specified, No other broadband
amplifier in this book or EMRFD show a capacitor between collector and
ground. Are these capacitors needed, if so what value and what purpose
do they serve?

TIA

Phil G8AAE

DPhil wrote:

I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18
Capacitors C8, C14 & C18 no value is specified, No other broadband
amplifier in this book or EMRFD show a capacitor between collector and
ground. Are these capacitors needed, if so what value and what purpose
do they serve?

TIA

Phil G8AAE




Schematic? My edition of "QRP Notebook" only goes to page 77.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

On Wed, 24 Aug 2005 21:49:39 +0100, "DPhil"
wrote:

I am trying to build the amplifier in W1FB's QRP Notebook, p.135, Fig 4-18
Capacitors C8, C14 & C18 no value is specified, No other broadband
amplifier in this book or EMRFD show a capacitor between collector and
ground. Are these capacitors needed, if so what value and what purpose
do they serve?

TIA

Phil G8AAE

Not meaning to be rude did you read the caption below the schematic?

Extracted text for those that do not have the book:
"..C8, C14 and C18 are shown only as optional units if it is desired
to roll off the high frequency response for a special application."

That should be enough explanation.

Allison