FULL PRODUCT DEVELOPMENT
IDEA → CIRCUIT → CODE → PROTOTYPE → PRODUCTION
DIVE DEEPER ↓
001 /// ATTRACT
© 2026 KD CIRCUITS LLC
SIGNAL: LIVE
002 /// FULL PRODUCT DEVELOPMENT

The Signal Path

01
DESIGN
  • Schematics, boards, and enclosures — engineered from scratch.
02
BUILD
  • Prototypes assembled, powered up, and made real.
03
CODE
  • Firmware, web, and mobile apps that run it all.
04
TEST
  • Debugged, validated, and proven to work.
05
SHIP
  • Handed off to manufacturing, ready to scale.
003 /// ABOUT

The Team

KD Circuits is a product-development team built the modern way: senior specialists in electrical, RF, firmware, software, and mechanical engineering, hand-picked for each project — with one point of accountability from first sketch to production. Founded by engineer and YouTube educator Kevin Darrah, it serves startups, small manufacturers, and inventors. Stuck mid-build? That's a specialty too.

FOUNDER ........ KEVIN DARRAH
TEAM ........... SENIOR SPECIALISTS
DISCIPLINES .... EE/RF/FW/SW/MECH/TEST/NPI
STATUS ......... ACCEPTING PROJECTS
RELEASE-GRADE DELIVERABLESEvery phase ends in files you own: schematics, gerbers, BOM, firmware source, test docs.
FIXED-SCOPE QUOTESScoped phases with clear exits — you decide at every via whether the signal continues.
PROTO TO PRODUCTIONFirst-run prototypes are assembled in-house for speed and control — production scales through your contract manufacturer, or ours.
004 /// TRACK RECORD

Mission History

PROCESSOR FAMILIES
ESP32
ESP8266
AVR / ATMEGA
STM32
PIC
nRF52
SAMD21
MSP430
ESP32
ESP8266
AVR / ATMEGA
STM32
PIC
nRF52
SAMD21
MSP430
TECHNOLOGIES
WIFI
BLE
NFC
LORA
GPS
CELLULAR
USB
ADDRESSABLE LED
OLED / E-PAPER
AUDIO / I2S
MOTOR & STEPPER
IMU
LOAD CELLS
ENV SENSORS
AC / RELAY CONTROL
BATTERY & CHARGING
WIFI
BLE
NFC
LORA
GPS
CELLULAR
USB
ADDRESSABLE LED
OLED / E-PAPER
AUDIO / I2S
MOTOR & STEPPER
IMU
LOAD CELLS
ENV SENSORS
AC / RELAY CONTROL
BATTERY & CHARGING
PRODUCT CATEGORIES
CONSUMER IOT
SMART HOME
MEDICAL & HEALTH
INDUSTRIAL MONITORING
AUDIO & MUSIC TECH
DRONES / RC
AGRICULTURE
WEARABLES
LED & LIGHTING ART
POWER & ENERGY
CONSUMER IOT
SMART HOME
MEDICAL & HEALTH
INDUSTRIAL MONITORING
AUDIO & MUSIC TECH
DRONES / RC
AGRICULTURE
WEARABLES
LED & LIGHTING ART
POWER & ENERGY
006 /// CONTACT
Report your project
Startup, small manufacturer, or solo inventor — from one stuck board to a full product program.