[time-nuts] Possible new run of TNS-BUF High Isolation, Low Noise Buffer Amp boards

John Ackermann N8UR jra at febo.com
Tue May 8 19:09:58 UTC 2018


Back in October, 2016, TAPR did a build-to-order offering of the TNS-BUF 
low noise, high isolation buffer amplifier.  The original 2016 post is 
attached below.  All of those units sold out, and recently I've had a 
few questions about whether more will be available.

TAPR will do another one-off production run if we can get orders for at 
least 25 boards (the minimum to make manufacturing viable) by *June 1*. 
You can place an order by going to http://tapr.org/kits_tns-buf.  The 
price will be the same as the previous production -- $119 plus shipping.

If we receive orders for at least 25 boards by June 1, 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 
your card will not be charged.

We expect to ship finished TNS-BUF boards about 60 days after placing 
the production order.

Best regards,
John

-------- Forwarded Message --------
Subject: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available
Date: Wed, 5 Oct 2016 10:15:46 -0400
From: John Ackermann N8UR <jra at febo.com>

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
http://www.febo.com/pages/TNS-BUF

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

http://tapr.org/kits_tns-buf

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!

John


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