LM555 Noise Maker Design

flux

I will create a synced noise maker with three LM555 astable oscillators, one as an LFO to sync the other two, plus a ring mod path and a switchable LP/HP/third-mode filter.
Plan summary:
  1. Add 3x LM555 astables with frequency/duty controls and LFO-to-audio reset-sync with selectable routing.
  2. Add ring mod block and switching: direct mix, ring-mod, bypass.
  3. Add multimode filter (LP/HP/third), cutoff/resonance, and bypass.
  4. Add power, output buffer/level, connectors, LEDs, and labels.
  5. Wire, review, then layout and BOM.
Click Start on the plan bar to proceed, and let me know if you’d like to change anything.
pweiner1212

pweiner1212

@schematic what supply voltage is VCC set to, and what’s currently connected to SIGNAL/OUTPUT? 9v DC

flux

Here’s what the schematic shows right now:
  • VCC supply: All “VCC” portals tie into net “Net 2”. There is no voltage property set on that net yet. “Net 2” currently connects to U1:VCC, U2:VCC, R5:P1, and J1:P2.
  • SIGNAL terminal: SIGNAL is not connected to any net.
  • OUTPUT terminal: OUTPUT is not connected to any net. Note: U2’s OUTPUT pin is on “Net 8” with R7:P1 and Q1:G, but the OUTPUT terminal isn’t tied to that net.
If you want VCC to be 9 V DC, confirm and I’ll set the net’s voltage property accordingly and wire OUTPUT as you prefer.
Set VCC to 9V
Connect OUTPUT terminal
Wire SIGNAL into input
Verify TLV3201 supply
Sign up to send
please explain what U1 does.
zizi01

zizi01

@copilot please explain what U1 does.
2y

copilot

U1 is a TLV3201AIDCKR, a comparator from Texas Instruments. In your voltage-controlled oscillator (VCO) design, it plays a critical role in generating the oscillation signal.
Here’s a breakdown of how it works in your circuit:
  1. Power Supply Connections:
    • Connect U1:VCCU1:VCC to the supply voltage (Net: 056bf7b3a6f77c206d8e1f3357dd1793). This supplies power to the comparator.
    • Connect U1:GNDU1:GND to ground (Net: a20e509d3de6d14de299b411ae114e8d) to complete the power supply circuit.
  2. Input Connections:
    • The inverting input (U1:−U1:-) is connected to a combination of components:
      • Connect U1:−U1:- to R1:P2R1:P2 (Net: 0b7c40fa1c5960e0b73d8d0df26134a7).
      • Connect U1:−U1:- to R4:P1R4:P1 (Net: 0b7c40fa1c5960e0b73d8d0df26134a7).
      • Connect U1:−U1:- to C1:P2C1:P2 (Net: 0b7c40fa1c5960e0b73d8d0df26134a7).
    • The non-inverting input (U1:+U1:+) is typically connected to a reference voltage and the output of a voltage divider or feedback network:
      • Connect U1:+U1:+ to R3:P1R3:P1 (Net: c1c6b466adaaa4893074e7f096a0f1af).
      • Connect U1:+U1:+ to R2:P2R2:P2 (Net: c1c6b466adaaa4893074e7f096a0f1af).
  3. Output Connection:
    • The output of the comparator provides the oscillating signal that will be used in the subsequent circuit stages.
    • Connect U1:OUTPUTU1:OUTPUT to C1:P1C1:P1 (Net: 07a029a3be91ffca9782aa4c753c655a).
Role in Oscillator Circuit:
  • Comparator Function: The comparator compares the voltages at its inverting and non-inverting inputs. When the voltage at the non-inverting input (++) is higher than at the inverting input (−-), the output is high. Conversely, when the voltage at the inverting input (−-) is higher than at the non-inverting input (++), the output is low.
  • Feedback Loop: The oscillation is achieved through feedback components (C1C1, R1R1, R2R2, R4R4) connected around the comparator. These components determine the frequency of the oscillation, controlled by the input voltage.
  • Charge and Discharge Cycle: Capacitor C1C1 charges and discharges through resistors, causing the comparator to toggle its output state. This toggling creates a square wave output, which is a fundamental characteristic of a VCO.
Let me know if you need further detail on any specific part of the comparator's operation within the VCO circuit!
2y
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2
VCC
R3
Resistance
49.9kΩ
R4
Resistance
49.9kΩ
R1
Resistance
100kΩ
Q1
J1

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Voltage-Controlled Oscillators

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An oscillator whose frequency is controlled by a voltage input. #project #VCO

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