🛠️ 1Hz–50 MHz DIY Digital LED Frequency Counter Kit (PIC-Based)

Compact, accurate, and easy to build frequency counter designed around a PIC16F628 and five 7-segment LED digits. Perfect for benches, labs, and DIY radio/electronics projects.

🔧 Key Features

• 📏 Wide Frequency Range: 1 Hz … 50 MHz

• 🔢 Five-Digit Resolution: displays as x.xxxx kHz / x.xxxx MHz / xx.xxx MHz

• ⚡ High Input Amplitude: measures signals up to ~30 V (see tips for best practices)

• 🔄 Crystal Measurement: supports 4–40 MHz passive crystal checks

• 🕒 Auto Range Switching: adaptive gate times for stable, precise reads

• ➕/➖ Programmable Frequency Offset: add/subtract an IF or reference offset

• 🔩 Very Low Parts Count: PIC16F628, 20 MHz reference crystal, 5× LED digits + a few resistors

• 🌙 Power-Saving Display: optional sleep if the reading doesn’t change for ~15 s

• 🔌 Flexible Power: USB 5 V or DC 5–12 V input

🧰 Typical Applications

• Amateur radio and RF prototyping

• Function-generator and oscillator verification

• Crystal sorting and trimming (4–40 MHz)

• Frequency readout for DIY transmitters/receivers

🧠 Tips for Best Results

• Keep input leads short and avoid long ground loops to reduce noise.

• For high-level signals, use a simple attenuator/probe to protect the input and improve accuracy.

• When measuring crystals, remove the crystal from its circuit and follow proper test wiring.

• Avoid enclosing the display and reference crystal in tight metal spaces that trap heat; temperature drift can affect readings.

📦 Package Includes

• 1 × 1Hz–50 MHz DIY Digital LED Frequency Counter Kit
  (Main board + LED display, Case, Cable)

💥 Volume Discount Offer — Buy More & Save

• 10% OFF when you buy 2 units

• 15% OFF when you buy 3 units

• 20% OFF when you buy 4 or more units
  Discount auto-applied at checkout.

🇺🇸 Premium Support & Shipping

• 🇺🇸 US Stock / Fast Shipping – 2–4 day delivery from Oklahoma, USA. Your purchase supports a US-based small business.

• 🧪 Quality Checked & Tested – Every unit is verified before shipping.

• 💬 Local Support – English help within hours, not days.

• 🔁 Easy Returns – 30-day returns; we pay return shipping.

• 📦 Professional Packaging – Safe delivery, 100% guaranteed.