Hi,
I'm having some trouble getting an LC tank oscillator to work. Basically I need to wind some inductors for a theremin project but I don't have an LC meter... Since LC meters are fundamentally just an LC osc and a frequency counter (AFAIK) I thought I could just breadboard a simple tank oscillator circuit, measure the frequency and plug it into the resonant frequency equation.
Unfortunately I can't get anything to oscillate i.e. I can't detect any useful amounts of AC with my multimeter. Specifically I'm thinking of Question 9 on this worksheet:
http://www.allaboutcircuits.com/worksheets/opamp10.html
TL70x is an OK part here, right? The nominal resonant frequency of the tank network I'm testing it with works out at just under 9KHz which I don't think is too fast for this opamp. What would be appropriate resistor values to make it work? Is my breadboard just broken? (possible)
Thanks for reading!
I'm having some trouble getting an LC tank oscillator to work. Basically I need to wind some inductors for a theremin project but I don't have an LC meter... Since LC meters are fundamentally just an LC osc and a frequency counter (AFAIK) I thought I could just breadboard a simple tank oscillator circuit, measure the frequency and plug it into the resonant frequency equation.
Unfortunately I can't get anything to oscillate i.e. I can't detect any useful amounts of AC with my multimeter. Specifically I'm thinking of Question 9 on this worksheet:
http://www.allaboutcircuits.com/worksheets/opamp10.html
TL70x is an OK part here, right? The nominal resonant frequency of the tank network I'm testing it with works out at just under 9KHz which I don't think is too fast for this opamp. What would be appropriate resistor values to make it work? Is my breadboard just broken? (possible)
Thanks for reading!