60 Hz Frequency Reference
60 Hz Frequency Reference
(OP)
I’m looking for an IC to build a 60 Hz (+/- 1%) frequency simulator. Output should be a 12 to 20 VPP sine wave. I would prefer to use a 12 VDC power source, but that is not likely given the amplitude of the output. A 24 VDC power supply would be the second choice. I know that I could use a 555 timer, but they require external components and I want to keep the device as small as possible. Has anyone seen a dedicated chip for simulating 50 or 60 Hz? Any other ideas?





RE: 60 Hz Frequency Reference
If waveform is critical (<1% error) Higher fr. osc, divider-
sine PROM - DAC ELSE function generator chip. If even less
critical (>5% error ) :lp filter.
<nbucska@pcperipherals.com>
RE: 60 Hz Frequency Reference
-- you neglected to mention how much current do you need
to supply.
If difficulty, send fax# for schematics anf full specs.
<nbucska@pcperipherals.com>
RE: 60 Hz Frequency Reference
Try ML2036 or ML2035 from fairchild, this a simple DDS frequency generator with senoidal output. You need add a low pass filter and operational amplifier to obtain a desired output level. This device operate in any frequency from DC to 25KHz.
http://www.fairchildsemi.com/an/AN/AN-42025.pdf
Regards,
M3
RE: 60 Hz Frequency Reference
RE: 60 Hz Frequency Reference
Unless you have some good reason to avoid the transformer, I'd just dig up one of the old wall wart transformers (from some long-forgotton home electronics) that you most likely have laying around in a junk drawer somewhere in your kitchen or basement. Just plug it in and voila, you have a free, very accurate and very stable 60Hz reference source.
Matter of fact, it's a good enough reference that not only old clocks, but some old TV's used to use the power supply for their time base.
RE: 60 Hz Frequency Reference
RE: 60 Hz Frequency Reference
http://www.fairchildsemi.com/ds/ML/ML2036C.pdf
app note at:http://www.fairchildsemi.com/an/AN/AN-42000.pdf
Available from Arrow electronics for $8.81. It runs on 5 volts, so you'll have to amplify it up and produce current u need. Also u have to load divider number in and provide either an external clock, or a ref crystal. It gives you about 1 Hz steps in produced frequency. Suitable xtals are listed on data sheet, or i'm gonna try a color telly xtal, cause i have those on hand. Implemented, this shouldn't cost more than $25 or so for low power levels.
I need it for a 50 Hz ref for a VCR (you can play PAL tapes on a usa vcr (NTSC) if you provide a 50 Hz ref to the head wheel circuitry. video comes out at a 50 Hz frame rate tho, so you need a tv with a vertical hold control to display picture.
Have fun..
Rab
RE: 60 Hz Frequency Reference
I don't believe the VCR speed control would need sine
I think XTAL--digital divider and perhaps amplifier
should do it.
<nbucska@pcperipherals.com>