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mstechca said:Where can I find the simplest phase lock loop circuit?
If I can use just transistors or simple logic gates to produce it, that would be great.
k7elp60 said:Without telling my age, I was experimenting with electronics before IC's were available. To build a phase lock loop in those days was next to impossible.
Not sure I really agree with that ... I suppose it depends on how wide a 'lock range' you want and wierd stuff like that but I have built a variant of The Poor Man's Caesium Clock, using an XOR detector and bandgap-tuned crystal oscillator, nice and simple and works OK (after some tweaking of monostables in the TV line seperator ??).Nigel Goodwin said:The CMOS 4046 is probably the simplest and easiest PLL to use, building one from discrete devices is likely to be a LOT more complicated.
mechie said:Not sure I really agree with that ... I suppose it depends on how wide a 'lock range' you want and wierd stuff like that but I have built a variant of The Poor Man's Caesium Clock, using an XOR detector and bandgap-tuned crystal oscillator, nice and simple and works OK (after some tweaking of monostables in the TV line seperator ??).Nigel Goodwin said:The CMOS 4046 is probably the simplest and easiest PLL to use, building one from discrete devices is likely to be a LOT more complicated.
Zener_Diode said:In it's datasheet is written "vco maximum frequency is 500Khz.
https://www.chipcatalog.com/National/Datasheet/LM565.htm
And I need 70MHZ....
Zener_Diode said:ok....
And what VCO should I take?
Zener_Diode said:I want a VCO chip. what chip number do you know???
Here is a PLL I cranked out that has no ICs, and only one type of transistor. You can use any general purpose NPN.mstechca said:I want to learn how to build my own. The more I learn, the smarter I get.