[time-nuts] TADD-1 Distribution Amplifier Available Again!

John Ackermann jra at febo.com
Sat Mar 22 14:56:34 EDT 2014

We discontinued selling kits for the TAPR TADD-1 distribution amplifier 
a couple of years ago when the MAX477 amplifier at the heard of the 
design became unobtanium.  There were reports that the Analog Devices 
AD8055 was a drop-in replacement, but I hadn't had a chance to test that.

Well, now I have and the AD8055 does in fact work fine.  In fact a 
TADD-1 with the AD8055 tested a couple of dB quieter than an otherwise 
identical board with the MAX477 (see the attached plot).  Gain and 
bandwidth are very similar.

So, I'm very pleased to announce that TAPR once again has the TADD-1 kit 
available for order.  The kit includes the PCB and parts, which are all 

If the product info page at


hasn't been updated yet to allow orders, you can go to


where you'll find the TADD-1 order link about half way down.  (I'm still 
working to sync up with the webmaster...)

Some parts are still on the way from the vendors, so shipping time is 
likely to be 10 to 14 days.

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