Hello. I have a question about a 555 timer LFO. I want to pair up two 555 circuits and make a synthesizer that has a pulse speed knob and a pitch knob. The first circuit controls the pulse and the second controls the pitch. I attached a picture of the schematic.
Now, I want to make it to where there is a switch that will bypass the pulse circuit (left hand circuit), leaving a continuous pitch (right hand circuit). I also want to make an on/off switch. I came up with two options.
Option A - A single SPDT on/off/on switch. The middle terminal would be connected to the +9V, while the outside terminals would be connected to the input of each 555 circuit. The left position would enable both circuits and the right position would just be the pitch circuit.
Option B - An SPST on/off switch to stop power from reaching the circuit and an SPDT on/on switch to choose between just the continuous pitch circuit or both.
Would this work? I am worried that when just the pitch circuit is enabled, current will flow backwards into the pulse circuit (through pin 3 and to the ground). Would this happen?
Thanks,
Nick
Now, I want to make it to where there is a switch that will bypass the pulse circuit (left hand circuit), leaving a continuous pitch (right hand circuit). I also want to make an on/off switch. I came up with two options.
Option A - A single SPDT on/off/on switch. The middle terminal would be connected to the +9V, while the outside terminals would be connected to the input of each 555 circuit. The left position would enable both circuits and the right position would just be the pitch circuit.
Option B - An SPST on/off switch to stop power from reaching the circuit and an SPDT on/on switch to choose between just the continuous pitch circuit or both.
Would this work? I am worried that when just the pitch circuit is enabled, current will flow backwards into the pulse circuit (through pin 3 and to the ground). Would this happen?
Thanks,
Nick
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