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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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Thread Tools | Display Modes |
5th May 2004, 09:43 AM
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Experienced Member
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frequency counter
im planning to build a function generator using the 8038 IC. the function generator is going to have a display for voltage (ill make that with a 7107) and a display for the frequency. what should i use for the frequency counter. i studied a counter in my logic design counter a few weeks ago but i want a single IC for the job. like the 7107 is a single solution for the voltmeter. any ideas????
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5th May 2004, 01:36 PM
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Super Moderator
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Function generator frequency measurement ?
Maybe a LM2907 frequency to voltage IC feeding into a second DVM chip could suffice ?
I have seen PIC programs for a PIC16F84 to do frequency measurement, displaying on an LCD - this could be ported to a PIC with analogue to digital converter onboard then it could do voltage measurement as well ??? Either way --- consider voltage measurement ... do you want peak voltage, average (as on cheaper multimeters, fine for pure sinewaves) or true RMS? all three methods give different answers on a triangular or sawtooth waveform ! My sig. genny (based on the same chip) just has a rough scale on the ampluitude control knob, I let my multimeter do anything I need accuracy for.
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I need a memory upgrade ... My head is full ! |
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5th May 2004, 01:46 PM
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Experienced Member
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using a PIC sounds nice but the price of the PIC+LCD is too much. i want to keep it cost effective too.
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help me out on this. what do u suggest |
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5th May 2004, 10:09 PM
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Experienced Member
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You could use 7-segment led displays driven by the pic...
If you multiplex them you won't need a pic with many pins.. |
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5th May 2004, 10:42 PM
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Experienced Member
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Have you considered using a 7208 frequency counter IC ? Its not a stand alone solution but the 7207 IC that generates the timing waveforms and frequency division for the 7208 is only a 14 pin dip and most of the pins are not used. Also the 7208 can multiplex seven 7-segment displays(common cathode) no other drivers needed.
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