Hello All About Circuits,
I am using a square wave oscillator 555/4013 (powered by 9v battery) connected to a LM2907 frequency to voltage converter (12v - ground +).
I have taken the positive from the audio out and put it into the frequency in (Fin) as you can see in the schematic. I am getting a responsive reading on my multimeter (by varying the oscillators frequency) without ground connected from audio out. 0 - 1.8 khz 1 - 2.4 dc
When I connect ground I get nothing. On the schematic, frequency in (Fin) am I doing something wrong in my connections??
circuit on page 10
http://www.ti.com/lit/ds/symlink/lm2907-n.pdf
I am using a square wave oscillator 555/4013 (powered by 9v battery) connected to a LM2907 frequency to voltage converter (12v - ground +).
I have taken the positive from the audio out and put it into the frequency in (Fin) as you can see in the schematic. I am getting a responsive reading on my multimeter (by varying the oscillators frequency) without ground connected from audio out. 0 - 1.8 khz 1 - 2.4 dc
When I connect ground I get nothing. On the schematic, frequency in (Fin) am I doing something wrong in my connections??
circuit on page 10
http://www.ti.com/lit/ds/symlink/lm2907-n.pdf
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