I was about to build or buy a resistor decade/substitution box when I came across Gerry's website, and I was impressed by his 7 Decade solution. I bought one and it was shipped safely to me in the US. You can't find better quality, don't go for the recent Chinese knockoffs, Gerry's is the original and the price is quite reasonable for such a good product. Just add four standoffs as legs, or box it up in a 3D printed box and you're ready to go.
Great concept and high quality construction from Gerry Sweeney on the 5-Decade Capacitor substitution tool. I was about to buy or build one when I ran across Gerry's website, and couldn't beat the price or quality. I ordered one and it was shipped to me safely in the US. The documentation is outstanding and very complete.
I love the idea to create a decade this way, very easy to use. Since it does not have switches it will not have switch contact problems developing with time. Also, good quality components, keeps the 1% precision throughout the whole range.
Boards are very nicely made and look wonderful. Using the readily available, used, Oscilloquartz 8663-XS crystals, the product calibrated perfectly on the first try (after a sufficient warm up period of about 24 hours).
The only thing I would ask for is a board that is already populated, minus the XO, because I just stink at SMD soldering :)
Thanks for the review, much appreciated. I do sell the completed unites, tested and ready to go. I decided not to do part assembly because testing and verification would be hard on half a job. Assembling and testing the full thing justifies the cost for the time spent, selling a part assembled unit would not price well which was the other factor.
I bought this Resistor Decade a while ago and so far used it when testing out a RC low pass filter and also for determining the current limiting resistor for a LED to get just the right amount of light at 3.3 volts.
Using standard 0.1" jumpers instead of thumbwheel- or rotary switches to get the cost down is a really good idea. I wish I got that idea myself :)
If pressed to come up with some bad things about it I can only think about two really minor improvements: Use gold plated headers and re-arrange the resistors at the bottom a bit so you could fit "self adhesive rubber bumpers" on the bottom to get it up from the desk. (My desk is usually filled with solder blobs and cut component leads)
So far the contact resistance with the tin plating is perfectly fine, but I've always had a distrust of anything non-gold when it comes to contacts.
But I'm very happy with my unit and would give a 100% recommendation to get one to anyone who asks me about it.