As usual, Dr. Griffiths has provided all we need.
Back in 2007 I had a similar issue and he worked out this very nice circuit
using easy to find 2N3904 BJTs.
I simulated the circuit using PSPICE. Here are the details.
https://www.darksmile.net/ee/frequency_doubler_BJT.html
George
On 9/10/2020 19:11, Bruce Griffiths wrote:
You could use either the NIST CG JFET doubler or its bipolar CB equivalent.
Bruce
On 11 September 2020 at 08:43 Tobias Pluess <tplu...@ieee.org> wrote:
Dear colleagues
I recently got a FTS1000 oscillator. (Not FTS1000A or B, but just FTS1000,
I assume it is the first version). It is a very nice unit, but I wanted to
know a bit more about its construction and opened it.
After I had replaced the foam which was already quite dissolved, I began
reverse engineering the output amplifier.
Has someone perhaps already done that?
I was thinking about whether it would be possible to replace the output
amplifier with one that has an integrated doubler (as my unit is a 5MHz
version).
BR
Tobias
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