Hi
A newbie question... I am making a small synthesizer that consists of an audio oscillator (basic 555 timer circuit), a Low Pass Filter (using a LM13700), and a Low Frequency Oscillator as a CV source (also a basic 555 circuit). These circuits are all run off the same power source -9V battery cell.
The problem I am experiencing is that the LFO circuit which has its output tied to the filter, is creating unwanted interference to the audio even when the output is not connected to the filter. I understand that I need to isolate this circuit somehow. All I can gather by scanning the forums is that this can be done with an optocoupler or maybe a voltage regulator. Would someone be so kind as to enlighten me as to how exactly?
It would be easy for me to insert something on any/all of these 3 circuits as they are on separate PCBs... Thanks in advance
A newbie question... I am making a small synthesizer that consists of an audio oscillator (basic 555 timer circuit), a Low Pass Filter (using a LM13700), and a Low Frequency Oscillator as a CV source (also a basic 555 circuit). These circuits are all run off the same power source -9V battery cell.
The problem I am experiencing is that the LFO circuit which has its output tied to the filter, is creating unwanted interference to the audio even when the output is not connected to the filter. I understand that I need to isolate this circuit somehow. All I can gather by scanning the forums is that this can be done with an optocoupler or maybe a voltage regulator. Would someone be so kind as to enlighten me as to how exactly?
It would be easy for me to insert something on any/all of these 3 circuits as they are on separate PCBs... Thanks in advance