Thanks Roelof..!
It looks like a fairly narrow band preamp with good Q...I guess it depends
on the Q of the inductors...I'll put the design to good use..!
73...Jordan....
----- Original Message -----
From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Friday, September 04, 2009 3:54 AM
Subject: Re: LF: Low frequency preselectors?
Hello Jordan,
Sorry for the delay, I just forgot to answer your question.
In the attachment you will find the circuit diagram of a tuneable
pre-amplifier.
I have build several of these and the frequency response is quite narrow.
The circuit has ample gain and using the rf-gain control, the tuned
circuit is "damped", which broadens the response. The gain is realised by
the impedance transformation of the tuned circuit, which results in
considerable voltage gain. The amplifier is a voltage follower with an
output impedance of 50 ohm.
Best regards,
Roelof Bakker, pa0rdt
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