Welcome to: 


by EA3GCY                                                                                      made in SPAIN

NEW!                ARDU-5351OS Arduino Open Source. Semi-KIT

50kHz to 99.9MHz generator based on the SI5351. The "OS" (Open Source) version is intended for programming practices with Arduino and the SI5351 generator. You can download the sketch and modify it for your needs. You must have previous programming knowledge with Arduino.

The "OP" version is a Semi Kit that includes: PCB with all SMD components installed, pins strips for connections and rotary encoder (does not include the SI5351 module, Arduino Nano module or OLED display).

An open source program with the following functions is offered:

  • Steps: from 10Hz to 1MHz
  • Outputs: 1 variable output and 2 fixed outputs
  • Frequency range: from 50kHZ to 99.9MHz (configurable on Arduino code)
  • Offset IF configurable on Arduino code.


For a Universal VFO see "ARDU-5351 Full KIT" version


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About me

My name is Javier Solans and I'm technical manager of "QRP Ham Radio Kits." I have worked in the amateur radio world nearly 40 years.

My main activity has been based on radio circuit design and maintenance and microcontroller programming.

I started with the distribution of ham radio kits in 1990.

It has been my true passion since I was very young.


73 de Javier EA3GCY 


Basic and advanced Kits for ham radio builders.

Classic assembly with through-hole components on two-sided boards. PCB pads, traces and holes suitable for home soldering.

Minimum use of SMD parts (factory pre-soldered). Step-by-step assembly manuals with maximum detail to avoid failures. We do not like frustrations!


You can view the EA3GCY history from third parties on Google, YouTube...


To place orders, use the shopping cart and make the payment through Paypal. You can also use your credit card with PayPal. However, you can send me your order list and I'll send you a "PayPal invoice" with the total amount.  

Bank transfer from EC countries: 5% discount, send me your order list.

If any question arises regarding your order, do not hesitate in email me to ea3gcy@gmail.com

Usually, shipments will be made on Wednesday of each week.