[time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available

John Ackermann N8UR jra at febo.com
Wed Oct 5 10:15:46 EDT 2016

I've previously mentioned a high performance buffer amplifier called the 
"TNS-BUF" that I built based on a design by Dr. Bruce Griffiths with 
further input from John Miles. Key numbers are:

*  Phase noise -140dBc/Hz at 1 Hertz offset, noise floor -175dBc/Hz.
    (PN plot attached)
*  Reverse isolation greater than 100dB; low enough that I can't make a
    trustworthy measurement.
*  Gain from -10 to +7 dB from 1 to 30 MHz; maximum output >18dBm.
*  Nominal 18VDC operation, but works down to 12V with lowered
    maximum output level.

There's information, including performance data and schematic, at

There seems to be some interest in an amplifier like this, so TAPR has 
decided to do a limited production run.  The amp is built with surface 
mount parts, so we thought an assembled and tested board was better than 
a kit.  The price will be $119 each.  But we have no idea how much 
interest there is, and we need to build a minimum of 25 units to make 
production feasible.

So, here's the deal:  you can order your TNS-BUF at


through *October 20*.  If we receive orders for at least 25 boards by 
then, we will charge credit cards and place the production order with 
our contract manufacturer.  If we don't get 25 orders, we'll cancel the 
project and credit cards will not be charged.  There's no guarantee that 
boards will be available for later order.

We expect about 60 days between placing the manufacturing order and 
receipt of the boards at TAPR.  We'll ship to customers ASAP after 
receipt.  So that means you can expect to receive your order shortly 
after January 1.

So, go to http://tapr.org/kits_tns-buf now to place your order before 
the deadline!


-------------- next part --------------
A non-text attachment was scrubbed...
Name: tns-buf-rev_b-4hour_config-b_pn.png
Type: image/png
Size: 105063 bytes
Desc: not available
URL: <http://www.febo.com/pipermail/time-nuts/attachments/20161005/8566375b/attachment-0001.png>

More information about the time-nuts mailing list