Yes but only when the PLL is tuned exactly to the modulating frequency. If it is not exactly the same then it needs additional time to lock to the modulating frequency.

The super-regen receiver has some capacitors that attenuate its squegging oscillation that might also slow things down.
I think the receiver is designed to slowly switch a relay on and off.
CHEAP, CHEAP, CHEAP, CHEAP stuff works poorly.

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Uncle $crooge

 

How small could something like this be made and how low could the power be reduced to? Like 1.5 or 3 volts, maybe pulse it?

Hero999 you input is welcome as well. I have a need for this as well. Not trying to hijack the thread.

 

The transmitting transistor would transmit very low RF power with a low supply voltage. So its range will be small.
An ordinary Cmos gate has a minimum supply of 3V but its output current is very low. A 3V battery's voltage drops to 2V over its life. A 74HCxx Cmos gate has a minimum supply voltage of 2V and has a higher output current.

What good is a transmitter that is not turned on? Hardly ever used like a car door remote entry?

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Uncle $crooge

 

What is a flux residue? Need to clean it up after using the liquid flux?

How do I calculate the frequency of the Cmos oscillator?
Why I can't do it like mentioned previously, just add a pull up resistor. From your schematic, the transistor also acts as a switch right?

Thanks

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bananasiong

 

The flux basically 'floats' to the top of the soldering joint once the solder hits it and leave a residue over the top of the joint, some types of flux leave a corrosive residue which needs to be cleaned off afterwards. Depends on the flux.

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The Cmos oscillator turns on the transmitter and turns it off. Then the modulation is digital AM.
The calculation for a classic Cmos oscillator is here:

Attached Thumbnails

 

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Uncle $crooge

 

Where are the values from? 0.559 and 0.455.

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bananasiong

 

MM is an IC prefix used by National Semiconductor so it might have been on their applications note. The same formula is in my "Cmos Cookbook" written by Don Lancaster.

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Uncle $crooge

 

From the attachment, it says that if the supply is higher, the higher it can oscillate, means frequency?

The receiver is really pO.or
After it is tuned well, the next day or after it has been turned off for a while, I need to re-tune it, or else I cannot get the signal transmitted. And sometimes, no matter how I tune it, it just wouldn't work. Then it worked the next day -_-"
Now it is not working, maybe I'll try it tomorrow..

Thanks

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bananasiong

 

A Cmos inverter or gate has a higher output current with a higher supply voltage so it can switch faster. I use a two-inverters Cmos oscillator at 1.6MHz on a 12V supply and it works well.

I think your receiver is crappy. Cheap, cheap cheap!

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Uncle $crooge

 

Yea, really crappy, cheap, and poor! It isn't worth as its price. The parts can be got easily, only the pcb I cannot make it.

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bananasiong