12kHz oscillator cct anybody?
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Posted by Martin Peters on May 13, 2005, 1:29 am
Please log in for more thread options Hello, Any helpful soul out there able to point me to a schematic for a transistor (or 1 chip) cct that'll deliver a fixed 12kHz output? Thanks - Martin | |||||||||||||||||||||||||||||||||||||
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Posted by John Popelish on May 12, 2005, 10:08 pm
Please log in for more thread options Martin Peters wrote: | |||||||||||||||||||||||||||||||||||||
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Posted by Martin Peters on May 13, 2005, 9:49 am
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> >
> > > What waveform? How fixed?
Sorry - sine wave, and stable enough so that when it's mixed (with SA602) with another signal which is then tuned with a radio in sideband mode, it won't require retuning after warm-up. This more improtant than actual accuracy of the 12kHz. 100Hz here or there not important. Thanks - Martin | |||||||||||||||||||||||||||||||||||||
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Posted by colin on May 13, 2005, 2:39 pm
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>
> > >
> > > > > What waveform? How fixed?
>
> Sorry - sine wave, and stable enough so that when it's mixed (with SA602) > with another signal which is then tuned with a radio in sideband mode, it > won't require retuning after warm-up. This more improtant than actual > accuracy of the 12kHz. 100Hz here or there not important. > > Thanks - Martin > > in that case you probably need a crystal for stability, dividing it down to 12khz, the most comon nearest is 32khz but this doesnt divied into 12 very well, you can get 'programable crystal oscilators', wich have internal divide by n counters. you can use a filter to clean the squarewave into a sinewave. or maybe you have another crystal oscilator somewhere in your circuit you can divide down ? Colin =^.^= | |||||||||||||||||||||||||||||||||||||
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Posted by John Fields on May 13, 2005, 6:12 pm
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On Fri, 13 May 2005 06:49:25 GMT, "Martin Peters" >
>> >
>> > >> What waveform? How fixed?
>
>Sorry - sine wave, and stable enough so that when it's mixed (with SA602) >with another signal which is then tuned with a radio in sideband mode, it >won't require retuning after warm-up. This more improtant than actual >accuracy of the 12kHz. 100Hz here or there not important. --- HC4066 +5 +----------------------+ | +--|MR | [100R] | | | | GND | RS RTC Q8 | +--[3.6nF]--[50mH]-->>--+
+-+------------+---+---+ | |
| | | C [100R] +----[1M]----+ +--[1000R]---B 2N4401 | | | E +--->>--+
| [500R] | |
| | GND GND +---[XTAL]---+ | | [10pF] [10pF] | | +------------+ | GND The 4066 is being used as an oscillator and a divider, with the crystal frequency at 6.144 MHz. After being divided by 512, it exits the counter as a 12kHz square wave and is then sent through a bandpass filter to make the AC sine wave you need from it. I simulated it with LTC's SWCADII, and the netlist follows. The crystal is an Epson CA-301 6.1440M-C and the component values arount it are from a design guide they have at: http://www.eea.epson.com/go/Prod_Admin/Categories/EEA/QD/Crystals/mhzThruhole_Crystals/go/Resources/TECHNOTES/OSCDESIGNGUIDE No guarantees, but it's a starting point! Here's the netlist: Version 4 SHEET 1 880 680 WIRE -224 432 -224 176 WIRE -224 560 -224 512 WIRE -224 592 -224 560 WIRE -80 432 -80 384 WIRE -80 560 -224 560 WIRE -80 560 -80 512 WIRE -64 176 -224 176 WIRE -32 384 -80 384 WIRE 80 384 48 384 WIRE 144 176 16 176 WIRE 144 336 144 176 WIRE 144 560 -80 560 WIRE 144 560 144 432 WIRE 208 176 144 176 WIRE 352 176 272 176 WIRE 352 240 352 176 WIRE 352 416 352 320 WIRE 352 560 144 560 WIRE 352 560 352 496 FLAG -224 592 0 SYMBOL voltage -224 416 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL npn 80 336 R0 SYMATTR InstName Q1 SYMATTR Value 2N4401 SYMBOL voltage -80 416 R0 WINDOW 3 -30 212 Left 0 WINDOW 123 -30 240 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value PULSE(0 5 0 0 0 4.167E-5 8.33E-5) SYMBOL res 64 368 R90 WINDOW 0 -37 56 VBottom 0 WINDOW 3 -35 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 1000 SYMBOL res 32 160 R90 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL cap 272 160 R90 WINDOW 0 -18 -15 VBottom 0 WINDOW 3 -18 -20 VTop 0 SYMATTR InstName C1 SYMATTR Value 3.6E-9 SYMBOL ind 336 224 R0 WINDOW 0 -47 45 Left 0 WINDOW 3 -66 80 Left 0 SYMATTR InstName L1 SYMATTR Value 50E-3 SYMBOL res 336 400 R0 SYMATTR InstName R3 SYMATTR Value 100 TEXT -258 648 Left 0 !.tran 0 .005 .004 uic -- John Fields Professional Circuit Designer | |||||||||||||||||||||||||||||||||||||
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>
> Any helpful soul out there able to point me to a schematic for a transistor
> (or 1 chip) cct that'll deliver a fixed 12kHz output?
>
> Thanks - Martin
>
>