vco

I'm trying to make a VCO from this schematic but I can't get it to work. My oscilloscope broke so I can't use it but when I plug in my headphones I only hear a slight DC voltage. (The circuit runs on a single supply)

I have this circuit where I will use as a DCO called common source Colpitts Oscillator the problem is i try to connect two capacitors in parallel to the C1 capacitors then put a switch in between them something like this. where if the switch is on then it turns into parallel then it varies...

I am using ROS-43-119+ from Mini-circuits. I need a VCO that can generate a 40MHz frequency. ROS-43-119+ can generate my required frequency by controlling the tuning voltage. I need sinewave output from the VCO. There is no mention of the output type in the datasheet. So what is the out type...

Hi everybody !! Well, I recently made the famous LM358-based VCO as in this article : https://www.allaboutcircuits.com/projects/diy-synth-series-vco/ Everything seems to work fine except those buffers which I can't get to work at all and I just can't understand why ... I've already tried...

Hi, I'm new here so please let me know if this is in the wrong place to post this or if I should be doing anything differently. (also, hi!) So I'm building a modular synth system using the Frequency Central Power Supply. I've recently built this VCO on a breadboard, and it functions perfectly...