neazoi
Advanced Member level 6
Do you have mains AC in the vicinity? Here's an idea. Tap into that. It will give you stable 50 or 60 Hz. Then divide by 2 through a flip flop.
You probably do not need to connect directly to mains. It should be possible to pick up mains hum in appliances several feet away. The right length, or shape, of antenna might help. Amplify the signal. Divide by 2 or 3 as you desire.
No, that is not a good idea. AC mains, at least in Greece is not accurate to 50Hz, I do not know what is the case in other countries.
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That is exactly what I considered.For example if 32Hz was the reference producing 1MHz, 32.1Hz would produce 0.1Hz error in the 1MHZ, in other words the error is not multiplied.
Brian.
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Actually not necessarily true in the case of 'Huff n Puff', the lock range depends on the available control voltage range and it's tuning coefficient. In fact the biggest problem with this kind of control mechanism is difficulty changing the frequency and re-locking again. I note the kit mentioned a few posts back uses a variable time constant to allow rapid tuning with the stabilizer catching up only after the tuning stops.
Brian.
In fact, the design posted is a slow puff n huff stabilizer.
It will have difficulty in stabilizing in higher frequencies.
The cure is the Fast version of it, which uses a shift register.
It is only the simplicity of the slow version that makes it interesting, a flip flop and a reference frequency.
The fast version used a sipo shift register which includes many flip flops.
I see a possibility of making a discrete slow version and the major problem is the reference clock.