I thought the same thing Space Varmint, I know Origami but not that kind =) Origami is apparently a martial arts style as well as a paper folding art.
Nope - it's just a paper folding art!
As part of the NVQ level 2 coaching course we had to teach something to a portion of the class (while the rest watched), and it was strongly suggested that we choose something other than martial arts.
I choose Origami, my chief instructor taught a game we do with the kids (which none of the other instructors had ever seen), and EVERYONE else taught martial arts, mostly kata's or set's - depending on their style.
One bright young 'prat', who came in a multi-coloured gi, tried to teach breaking boards - this to a room full of dan grades all higher than him, we all told him where to stick his boards, we've got more sense than that
When you figure out how to make PC boards with origami, do let us know.
Hi SV! I'm going very slow...too slow.
Futurlec only shipped half my last order.
They thought they had shipped it all!
I'm waiting for experimenter boards and trimmer caps.
Still have to order toroid cores and wire.
Would someone please recommend Dual Gate Fets for RF amp and mixer for 3 to 20 mhz. Best for me is something that Futurlec has in stock or is very common.
I also need to get air variable tuning caps.
Then I will try some circuits.
Playing around with SV's VFO, what I have so far.
The two caps under L1 & L2 only provided parasitics.
They did not affect the wanted frequency. Since a buffer would be used after the osc. R1 can be much higher in value than 60 ohms (50+10) for a greater swing.
This should also allow a smaller coupling cap to the buffer.
For the buffer I'm thinking of another FET (for now).
I've played with all the components and the frequency, wave shape and gain (except R1) are almost completely dependent on L1 & L2. Putting caps across either one or both only causes problems. A small C2 works best and only 1M works for R2.
The wave shape is terrible! I can't manage to improve the upper part of it. It remains flat no matter what I've tried. What I guess is needed is better DC biasing of the FET. I have done no designing of FET amp or osc. circuits.
Your right, Nigel, it is so different than what he suggested that I can not call it SV's VFO.
I will try his circuit again if I can get Proteus to give me a tapped inductor. I did not find one so used two iductors in series.
Why is that illegal? Something to do with mutual inductance?
I did not notice my mistake about not bypassing the drain and taking the signal from the source. Very sloppy!
The 5pf worked well. Tried many values. 3pf did not work.
100pf or 50pf did not work better.
Hold on a minute, what worked well?I will try his circuit again if I can get Proteus to give me a tapped inductor...
...The 5pf worked well. Tried many values.
Hold on a minute, what worked well?
Reality check here, this is not radio it is a computer game!
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