Here’s a practical, no-nonsense way to use that 16 V / 83 F supercapacitor module as a clean power buffer for radio / SDR work.

🔧 Basic idea

You want three things:

1. Safe charging
2. Stable output voltage
3. Noise suppression

🧩 Recommended circuit (robust and simple)

      +DC SUPPLY (12–18V)

              │

          [Fuse]

              │

        [NTC / 10Ω resistor]

              │

          [Schottky diode]

              │

        +--------------+

        | Supercap     |

        | 16V 83F      |

        +--------------+

              │

        [LC filter]

              │

     [Buck / Buck-Boost Converter]

              │

         Clean DC Output

         (e.g. 5V / 9V / 12V)

              │

            LOAD

⚙️ What each part does

1. Inrush limiting (CRITICAL)

• Use:
  • 10–20 Ω resistor or
  • NTC thermistor (better)

👉 Without this, the caps look like a short circuit at power-on.

2. Schottky diode

• Prevents caps dumping back into supply
• Use something chunky like:
  • 5–10 A rated

3. Supercapacitor module

• Your 16 V / 83 F bank
• Keep wiring short and thick

4. LC filter (noise killer)

• Example:
  • Inductor: 10–47 µH
  • Capacitor: 470–2200 µF low ESR

👉 This is especially useful for SDR / RF front ends

5. DC-DC converter (very important)

Because voltage falls from 16 V → 0 V:

Best choice:

• Buck-boost converter
  • Keeps output stable even as caps discharge

Examples:

• 5 V SDR → use buck-boost
• 12 V radio → buck (if you only use upper range)

📡 Why this works well for radio

✔ Ultra-low noise supply

Supercaps act like:

• A huge low-impedance reservoir
• Excellent at killing:
  • Switching spikes
  • USB noise
  • PSU hash

✔ Handles current spikes

Great for:

• SDRs
• LNAs
• Transmit bursts (if applicable)

✔ Ride-through capability

If supply dips or disconnects:

• System keeps running silently

⚠️ Important pitfalls (worth knowing)

1. Don’t run caps right at 16 V

• Safer:
  • Charge to 14–15 V
• Extends life significantly

2. Cheap modules ≠ perfect balance

• Cells may drift
• For long-term use:
  • Add active balancing (optional but ideal)

3. Efficiency tradeoff

• Buck-boost converters add:
  • Some noise
  • Some loss

👉 LC filter after converter helps again

🔬 Practical SDR example

For something like an SDRplay setup:

• Charge caps to ~15 V
• Buck-boost → stable 5 V
• Add:
  • Extra linear regulator (LDO) after converter for ultra-clean RF stages

💡 Nice upgrade (if you want “laboratory clean”)

Add after the DC-DC converter:

DC-DC → LDO regulator → RF gear

This gives:

• Switching efficiency + linear cleanliness

🧠 Quick intuition

At 16 V:

• You’ve got ~10,000 joules
• That’s why:
  • It smooths everything
  • It behaves almost like a “silent battery”