Quote:
Originally Posted by J_Player
Hi Fred,
It appears the 4017 is serving only to insure the output remains at 10% duty cycle as you adjust for different frequencies with R6.
I suppose you could re-wire the 4017 with a CO jumper to change to any other duty cycle in 10% increments.
But from what I see in the circuit, it was probably found that 10% duty cycle was good.
I am guessing it was set at a constant 10% to prevent the duty cycle from changing from maybe 1% to 99% if you adjust R6 through a large range of frequencies.
Depending on the impedance of L1-C5, it appears this is probably a low power oscillator.
I am thinking the radiated power will change as the frequency is changed.
I wonder where the other parts in the box connect?
Best wishes, 
J_P |
Hi J_P.
Yes, it is a low power device
I did not measure the radiated power but i believe that it is not stable with the frequency.
Regards