Re: LF: Low frequency preselectors?

["Jordan" <outposter30@shaw.ca>]

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" <roelof@ndb.demon.nl>
To: <rsgb_lf_group@blacksheep.org>
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