R
Rich Grise
- Jan 1, 1970
- 0
C'mon, folks! The first requirement was "No PIC's", and the first 4
responses are "Use a PIC".
Doing it with BCD counters (like 7490) and decoders (like 7447) is
almost trivial. I'd be asking, what's the signal source? Pulse train?
For that, just count pulses over some known interval. Analog voltage
level? ADC and bin/bcd translator (unless somebody makes a 3-digit
BCD ADC. Hmm ... "Digital voltmeter" springs to mind...)
If you really want to get fancy-schmancy, I saw some guy design
a circuit using just counters, latches, and some pulse trains to
actually count pulse intervals, then digitally divide a time base
by the result to give a readout in frequency. I still don't
understand the circuit, but it's definitely doable.
Good Luck!
Rich
responses are "Use a PIC".
Doing it with BCD counters (like 7490) and decoders (like 7447) is
almost trivial. I'd be asking, what's the signal source? Pulse train?
For that, just count pulses over some known interval. Analog voltage
level? ADC and bin/bcd translator (unless somebody makes a 3-digit
BCD ADC. Hmm ... "Digital voltmeter" springs to mind...)
If you really want to get fancy-schmancy, I saw some guy design
a circuit using just counters, latches, and some pulse trains to
actually count pulse intervals, then digitally divide a time base
by the result to give a readout in frequency. I still don't
understand the circuit, but it's definitely doable.
Good Luck!
Rich