Aleksander Alekseev
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Can I double (or increase) the frequency of crystal oscillators by combining them in a circuit?
2 votes

What you are looking for is called "frequency doubler" schematic. Schematics can be found online or in the following books: "QRP Classics", "Solid State Design for the Radio ...

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How to accurately measure ~1 A on 3-30 MHz?
Accepted answer
0 votes

So I found an answer in the recent video on FesZ Electronics YouTube channel. As it turns out, you can make a decent AC current probe simply by winding several turns on a suitable ferrite core and ...

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How to choose a substitution transistor for a feedback amplifier?
0 votes

I stumbled upon an article HF Transmitting Transistors for QRP by Richard VK6TT which may contain the answer. The problem is that fT is actually a function of Ic. This circuit has quiescent current ...

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