A
albert
- Jan 1, 1970
- 0
I need a low power vco. A 74HC13 or 4000 series logic oscillator would
be good, but I can't figure out how to make the frequency vary.
I need it to oscillate between 65 Kc and 70 Kc with a control voltage
in the 1 to 5 volt range, so it does not have to operate over a wide
range.
It has to be a 50 percent duty cycle however. It can have a sine wave
output (which is preferred), but a 0 to 4 volt ttl type square wave
output is ok.
I need someting simple, and I'm trying to avoid the low power 555
timers as they don't have 50 percent duty cycles and thee lowest power
variant of the 555 still draws 500 ua quiescent current.
I've googled and found good info on cmos logic based oscillators, but
no way to make them variable with a dc control voltage.
Any suggestions?
Thanks
A
be good, but I can't figure out how to make the frequency vary.
I need it to oscillate between 65 Kc and 70 Kc with a control voltage
in the 1 to 5 volt range, so it does not have to operate over a wide
range.
It has to be a 50 percent duty cycle however. It can have a sine wave
output (which is preferred), but a 0 to 4 volt ttl type square wave
output is ok.
I need someting simple, and I'm trying to avoid the low power 555
timers as they don't have 50 percent duty cycles and thee lowest power
variant of the 555 still draws 500 ua quiescent current.
I've googled and found good info on cmos logic based oscillators, but
no way to make them variable with a dc control voltage.
Any suggestions?
Thanks
A